CN110695495A - Welding process of water wall pipe for tower boiler field installation - Google Patents
Welding process of water wall pipe for tower boiler field installation Download PDFInfo
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- CN110695495A CN110695495A CN201910991794.5A CN201910991794A CN110695495A CN 110695495 A CN110695495 A CN 110695495A CN 201910991794 A CN201910991794 A CN 201910991794A CN 110695495 A CN110695495 A CN 110695495A
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- 238000003466 welding Methods 0.000 title claims abstract description 398
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000009434 installation Methods 0.000 title claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 96
- 210000001503 joint Anatomy 0.000 claims abstract description 56
- 229910052786 argon Inorganic materials 0.000 claims abstract description 48
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 48
- 239000011229 interlayer Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 9
- 239000002932 luster Substances 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 description 10
- 230000007547 defect Effects 0.000 description 9
- 239000010953 base metal Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of welding, and provides a welding process of a water wall tube used for field installation of a tower boiler, which comprises the following steps of S1, removing impurities on a groove of the water wall tube and two sides of an inner wall and an outer wall; s2, pairing the water wall tubes; s3, preheating the butt joint of the water wall tube before welding; and S4, performing at least three-layer welding on each butt joint. According to the welding process for the water wall pipe during field installation of the tower boiler, provided by the embodiment of the invention, under the condition of poor welding position of a construction field, by controlling the process parameters such as the opening clearance, the preheating temperature, the welding current, the welding voltage, the welding speed and the like of the butt joint, when argon arc welding bottoming welding is carried out on the butt joint of the T23 pipe, the welding quality of the butt joint can be ensured without filling argon gas into the pipe for protection.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a welding process for a water wall pipe during field installation of a tower boiler.
Background
The tower boiler water wall pipe usually adopts T23 pipe, and for the butt weld of T23 pipe, the welding method that adopts at present is: argon arc welding is firstly adopted for backing welding, then argon arc welding or manual welding is adopted for cover surface welding, and a method of filling argon gas into a pipe is adopted for protecting the back surface of a welding line during backing welding, so that the back surface of the welding line is prevented from being oxidized. The welding method has the advantages that: the requirement on the operating skill level of a welder can be slightly reduced, the quality of the welding seam of the priming coat is easy to guarantee, and the method is suitable for boiler construction with less T23 welded junctions, good welding positions and easy argon filling. The disadvantages of this welding method are: the method is not easy to implement in places with high difficulty in filling argon into the tube, and is not easy to implement under the conditions of complex tube bank structure, small distance between adjacent tubes and other welding position differences; even if this welding method is adopted in the case of the difference in welding position, there are drawbacks of low welding efficiency and high construction cost.
In the installation site of the tower boiler, the difficulties of large quantity of butt welding seams, narrow welding positions and large opening difficulty of the water-cooled pipe wall are caused by the large quantity of T23 pipes of the water-cooled wall, small pipe diameter, small pipe spacing, long pipes and complex pipe row structure; under the condition, aiming at the butt weld of the T23 pipe, argon is filled in the pipe for protection during backing welding, so that not only is the consumption of argon large, but also the argon filling effect is poor, the back of the butt weld cannot be completely protected, and the backing quality of argon arc welding is difficult to ensure; in the welding process, because the distance between the adjacent pipes is small, the heat dissipation speed of the pipes is low, metal overheating of a welding seam, a fusion area and a heat influence area is easily caused, austenite which does not complete bainite transformation in the welding area is subjected to high-temperature transformation, the metal structure is thickened, the temperature resistance and pressure resistance of the metal are reduced, and the phenomenon of overburning of the welding seam of the bottom layer is easily caused due to overhigh temperature.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a welding process for water wall tubes during field installation of a tower boiler, so as to ensure the welding quality of the water wall tubes during field butt joint.
The invention solves the technical problem by adopting the technologyThe scheme is as follows: a welding process for the water-cooled wall tube used for on-site installation of tower boiler features that said water-cooled wall tube is T23 tube
OrThe method comprises the following steps:
s1, removing impurities in the groove of the water wall tube and the range of 10-15 mm on two sides of the inner wall and the outer wall until the water wall tube is exposed with metallic luster;
s2, assembling the water wall tubes, adjusting the opening clearance of the water wall tubes to be 2.5-3.5 mm, and then performing spot welding on the butted water wall tubes;
s3, preheating a butt joint of the water wall tube before welding, wherein the preheating temperature is 150-200 ℃;
s4, welding at least three layers of butt joints; the first layer is argon arc welding backing welding, argon gas is not filled in the water wall tube for protection, the welding current is 100-110A, the welding voltage is 11-13V, and the welding speed is 55-65 mm/min;
the second layer is argon arc welding filling welding, the welding current is 105-115A, the welding voltage is 12-13V, and the welding speed is 45-55 mm/min;
and the other layers are subjected to cover surface welding by adopting argon arc welding or manual arc welding, wherein the welding current is 110-120A, the welding voltage is 12-13V, and the welding speed is 55-70 mm/min.
Furthermore, in the welding process of each butt joint, the interlayer temperature is 150-350 ℃.
Furthermore, the welding thickness of the first layer is 2.5-3 mm.
Furthermore, the welding thickness of the second layer is 1.5-2.5 mm.
Further, when the outer diameter of the water wall tube is
The backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and each butt joint is weldedThree separation points A, B, C are sequentially arranged at intervals in the circumferential direction of the cylinder; the first welding section starts welding from the position of the A point and finishes welding to the position of the B point; the second welding section starts welding from the position of the C point and finishes welding to the position of the A point; and the third welding section starts welding from the position of the C point and finishes welding to the position of the B point.
Further, the length of the welding section between AB is LABLength of the welded segment between CAs is LCALength of the solder segment between CBs is LCB(ii) a Wherein L isAB<LCA，LCA＝LCB。
Further, wherein LCA＝4×LAB。
Further, when the outer diameter of the water wall tube is
During welding, backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and five separation points, namely D, E, F, G, H, are sequentially arranged at intervals in the circumferential direction of each butt joint; the first welding section starts welding from the position of a D point and finishes welding to the position of an E point; the second welding section starts welding from the position of the D point and finishes welding to the position of the H point; the third welding section starts welding from the position of the E point and finishes welding to the position of the F point; the fourth welding section starts welding from the position of the G point and finishes welding to the position of the F point; and the fifth welding section starts welding from the G point position and finishes welding to the H point position.
Further, the length of the welding section between DE is LDELength of the welded segment between DH is LDHAnd the length of the welding section between EF is LEFAnd the length of the welding section between GF is LGFThe length of the welding section between GH is LGH(ii) a Wherein L isDE<LDH<LGH，LDH＝LEF， LGH＝LGF。
Further, wherein LGH＝2.5×LDH，LDH＝1.5×LDE。
The invention has the beneficial effects that: according to the welding process for the water wall pipe during field installation of the tower boiler, provided by the embodiment of the invention, under the condition of poor welding position of a construction field, by controlling the process parameters such as the opening clearance, the preheating temperature, the welding current, the welding voltage, the welding speed and the like of the butt joint, when argon arc welding bottoming welding is carried out on the butt joint of the T23 pipe, argon gas protection does not need to be filled in the pipe, and the welding quality of the butt joint can be ensured.
Drawings
FIG. 1 is a schematic illustration of a water wall tube bundle assembly according to the present invention;
FIG. 2 is a schematic structural view of a first embodiment of a butt joint for water wall tubes of the present invention during back welding;
FIG. 3 is a schematic structural view of a second embodiment of a butt joint for water wall tubes of the present invention during back welding.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
According to the welding process of the water wall tube used for the field installation of the tower boiler, the water wall tube is a T23 tube, and the specification of the water wall tube is
OrThe method comprises the following steps:
s1, removing impurities in the groove of the water wall tube and the range of 10-15 mm on two sides of the inner wall and the outer wall until the water wall tube is exposed with metallic luster;
s2, assembling the water wall tubes, adjusting the opening clearance of the water wall tubes to be 2.5-3.5 mm, and then performing spot welding on the butted water wall tubes;
s3, preheating a butt joint of the water wall tube before welding, wherein the preheating temperature is 150-200 ℃;
s4, welding at least three layers of butt joints; the first layer is argon arc welding backing welding, argon gas is not filled in the water wall tube for protection, the welding current is 100-110A, the welding voltage is 11-13V, and the welding speed is 55-65 mm/min;
the second layer is argon arc welding filling welding, the welding current is 105-115A, the welding voltage is 12-13V, and the welding speed is 45-55 mm/min;
and the other layers are subjected to cover surface welding by adopting argon arc welding or manual arc welding, wherein the welding current is 110-120A, the welding voltage is 12-13V, and the welding speed is 55-70 mm/min.
As shown in FIG. 1, for simplicity of illustration, only four water wall tube pairs are shown, the specification of which is
Wherein D is the outer diameter of the tube and t is the wall thickness of the tube; the distance between the outer walls of adjacent waterwall tubes is L2. According to design requirements, when the outer diameter of each water wall tube is larger, the distance L2 between the outer walls of the adjacent water wall tubes is larger; when the outer diameter of each water wall tube is smaller, the distance L2 between the outer walls of the adjacent water wall tubes is smaller; therefore, as the outer diameter of the water wall tube is smaller, the condition of the welding position thereof is worse.
Before the tower boiler is installed on site, the groove at the end part of the water wall pipe is machined by a lathe, and in step S1, before assembly, impurities in the range of 10-15 mm on the groove of the water wall pipe and the two sides of the inner wall and the outer wall of the water wall pipe are removed, wherein the impurities are oil, water, paint, scale, rust and the like, and the impurities are completely removed until the metallic luster is exposed. And then, whether the groove and the edge thereof have impermissible defects such as cracks, heavy skin and the like within the range of 20mm is checked, and the water wall tube group assembly can be carried out after the defect is determined.
In step S2, when the water wall tube group is paired, the tube should be firmly cushioned to prevent weld angular deformation and additional stress, and strong pairing is strictly prohibited during pairing to prevent reheat cracking and stress cracking after welding. As shown in FIG. 1, the opening-aligning gap of the assembled water wall tubes is L1, the opening-aligning gap L1 is controlled to be 2.5-3.5 mm, then the butted water wall tubes are spot-welded in an argon arc welding mode, and electric arcs or test currents cannot be ignited on the surfaces of the tubes randomly in the spot-welding process. After tack welding, the welding spot should be inspected, if welding defects are found, the welding spot should be removed by a special tool in time, tack welding is carried out again, and welding can be carried out after no defects are found through inspection.
In step S3, the butt joint of the water wall tube is preheated before welding by oxyacetylene flame, and in the flame heating process, a portable far infrared thermometer is used to measure the preheating temperature in the groove at any time, so that the preheating temperature of the butt joint is controlled at 150-200 ℃. In the process of flame heating, the moving speed of flame is stable, the heating width is more than 50mm of the extension of each of two sides of the butt joint, so that the temperature distribution gradient of the welded piece is uniform, and the combustion condition of the flame is carefully controlled in the process of preheating, so that the surface of the pipe is prevented from being carburized or oxidized.
In step S4, after the preheating temperature at the butt joint satisfies the requirement, at least three layers of welding are performed on each butt joint. The first layer is argon arc welding backing welding, the second layer is argon arc welding filling welding, and the other layers are argon arc welding or manual electric arc welding cover surface welding. During the first layer argon arc welding backing welding, the tube is not filled with argon gas for protection, so during the welding process, the tube must be welded according to the welding process parameters strictly, namely the welding current, the welding voltage and the welding speed are controlled within the required range strictly. The reason is that the welding current is a main factor influencing the depth of a molten pool, when the welding current is too small, the base metal cannot be fully melted due to lack of enough welding line energy, and the defects of unfused, concave and the like are generated on the back surface of a welding seam, and when the welding current is too large, the defects of overburning, undercut and the like are generated on the metal of the welding seam due to input of too large welding line energy. The welding voltage is a main factor influencing the width of a molten pool, and a proper welding voltage can form a certain molten pool width so that the base metal and the welding material can be normally melted; and the welding seam has defects of air holes and the like due to the excessively high welding voltage. The welding speed has obvious influence on the depth and width of a molten pool, the welding speed is too high, the base metal cannot be fully melted, the defects of incomplete fusion, concave concavity and the like are generated on the back of a welding seam, and the welding speed is too low, the defects of overburning, undercut and the like are generated on the welding seam metal due to the input of overlarge welding line energy.
Therefore, according to the welding process of the water wall pipe for the field installation of the tower boiler, provided by the embodiment of the invention, under the condition of poor welding position of a construction field, by controlling the process parameters such as the butt gap, the preheating temperature, the welding current, the welding voltage, the welding speed and the like of the butt joint, when the butt joint of the T23 pipe is subjected to argon arc welding backing welding, argon gas protection does not need to be filled in the pipe, the welding quality of the butt joint can be ensured, and the reheating crack tendency of the T23 pipe in the welding process can be avoided. Compared with the existing welding process, the welding efficiency is improved, and the production cost is reduced.
In order to further improve the welding quality of a welding joint, in the process of welding each layer, the welding gun is required to swing and move forward uniformly and stably, and because the position of a molten pool is constantly changed in the welding process, the included angles of the welding gun, a welding wire and a circumferential tangent line of a pipe are kept slightly as much as possible but not greatly changed, and the wire feeding speed is required to be uniform.
Preferably, in order to further improve the welding quality, the interlayer temperature is 150-350 ℃ in the welding process of each butt joint. Aiming at each butt joint, a multilayer welding mode is set, and the interlayer temperature is controlled, so that reheating cracks and grain growth which possibly occur in the welding process of the T23 pipe can be reduced, and the welding quality of the welding joint is improved. In the welding process, a portable far infrared thermometer can be adopted to measure the interlayer temperature, and preferably, the interlayer temperature is measured at a position 5-10 mm before the starting welding point.
The welding thickness of each layer also has great influence on the welding quality, when the welding thickness of the first layer is too thin, the welding seam of the first layer is easy to be welded through when the second layer is welded, welding beading is generated on the back of the welding seam, or the back welding seam is oxidized due to metal overburning caused by overhigh temperature; when the welding thickness of the first layer is too thick, the welding speed of the first layer is reduced, the welding line energy is increased, the temperature of a molten pool is too high, the back weld metal is easy to be burnt and oxidized, and the formed weld joint can also deteriorate the mechanical property of a welding joint. Therefore, in order to improve the welding quality, the welding thickness of the first layer is preferably 2.5 to 3 mm. The welding thickness of the second layer is 1.5-2.5 mm.
When argon arc welding backing welding is carried out, the heat dissipation speed has great influence on the welding quality, and because the distance between the outer walls of the adjacent water wall tubes is small, the heat dissipation effect is poor in the welding process, so that the temperature in a molten pool is overhigh, and the metal is overheated and oxidized. Therefore, when backing welding is carried out, the invention adopts a sectional welding mode to achieve the purpose of reducing the temperature in the molten pool, avoid the overhigh temperature in the molten pool and prevent the metal from being oxidized due to overburning.
FIG. 2 is a schematic structural view of a first embodiment of a butt joint for water wall tubes of the present invention during back welding; referring to FIG. 2, when the outside diameter of the waterwall tube is
During welding, backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and three separation points, namely A, B, C, are sequentially arranged at intervals in the circumferential direction of each butt joint; the first welding section starts welding from the position of the A point and finishes welding to the position of the B point; the second welding section starts welding from the position of the C point and finishes welding to the position of the A point; and the third welding section starts welding from the position of the C point and finishes welding to the position of the B point.
A, B, C are arranged clockwise on the circumference as shown in FIG. 2; of course, A, B, C could be located counterclockwise. The A, B, C three separation points may be virtual points or may be formed by spot welding positions of the water wall tubes during assembly. Preferably, the length of the welding section between AB is LABLength of the weld segment between CAs is LCALength of the solder segment between CBs is LCB(ii) a Wherein L isAB<LCA，LCA＝LCB. Further, wherein LCA＝4×LAB。
FIG. 3 is a second embodiment of the present invention of a butt joint for water wall tubes during backing weldingA schematic structural diagram of the mode; referring to FIG. 3, when the outside diameter of the waterwall tube is
During welding, backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and five separation points, namely D, E, F, G, H, are sequentially arranged at intervals in the circumferential direction of each butt joint; the first welding section starts welding from the position of a D point and finishes welding to the position of an E point; the second welding section starts welding from the position of the D point and finishes welding to the position of the H point; the third welding section starts welding from the position of the E point and finishes welding to the position of the F point; the fourth welding section starts welding from the position of G point and finishes welding to the position of F point; and the fifth welding section starts welding from the G point position and finishes welding to the H point position.
D, E, F, G, H are arranged clockwise on the circumference as shown in FIG. 3; of course, D, E, F, G, H five separation points may be arranged counterclockwise on the circumference. The D, E, F, G, H five separation points may be virtual points or may be formed by spot welding positions of the water wall tubes during assembly. Preferably, the length of the welding section between DE is LDELength of the welded segment between DH is LDHAnd the length of the welding section between EF is LEFAnd the length of the welding section between GF is LGFAnd the length of the welding section between GH is LGH(ii) a Wherein L isDE<LDH<LGH，LDH＝LEF，LGH＝LGF. Further, wherein LGH＝2.5×LDH，LDH＝1.5×LDE。
The mechanical properties of the T23 pipe parent metal are as follows: the tensile strength is more than or equal to 510MPa, the yield strength is more than or equal to 400MPa, and the Hardness (HB) is 160-220.
Example 1:
the water wall tube is a T23 tube with the specification of
The gap between the two openings is 2.5 mm; the preheating temperature is 150 ℃; the butt joint is welded in three layers; when the first layer of argon arc welding backing welding is carried out, the welding thickness is2.5mm, the welding current is 100A, the welding voltage is 11V, and the welding speed is 55 mm/min; when the argon arc welding filling welding of the second layer is carried out, the welding thickness is 1.5mm, the welding current is 105A, the welding voltage is 12V, and the welding speed is 45 mm/min; when the third layer of argon arc welding is used for cover surface welding, the welding current is 110A, the welding voltage is 12V, and the welding speed is 55 m/min; the interlayer temperature was 150 ℃.
The welding process in the embodiment is adopted to weld the water wall pipe, and the mechanical property of the welded joint is detected, and the result is as follows:
example 2:
the water wall tube is a T23 tube with the specification of
The gap between the two openings is 3 mm; the preheating temperature is 180 ℃; the butt joint is welded in three layers; when the first layer of argon arc welding backing welding is carried out, the welding thickness is 3mm, the welding current is 105A, the welding voltage is 12V, and the welding speed is 60 mm/min; when the argon arc welding filling welding of the second layer is carried out, the welding thickness is 2mm, the welding current is 110A, the welding voltage is 12V, and the welding speed is 50 mm/min; when the cover surface welding of the argon arc welding of the third layer is carried out, the welding current is 115A, the welding voltage is 13V, and the welding speed is 60 m/min; the interlayer temperature was 200 ℃.
The welding process in the embodiment is adopted to weld the water wall pipe, and the mechanical property of the welded joint is detected, and the result is as follows:
example 3:
the water wall tube is a T23 tube with the specification of
The gap between the two openings is 3.5 mm; the preheating temperature is 200 ℃; the butt joint is welded in four layers; first layerWhen backing welding is carried out by argon arc welding, the welding thickness is 3mm, the welding current is 110A, the welding voltage is 13V, and the welding speed is 65 mm/min; when the argon arc welding filling welding of the second layer is carried out, the welding thickness is 2.5mm, the welding current is 115A, the welding voltage is 13V, and the welding speed is 55 mm/min; when the argon arc welding cover surface welding is carried out on the third layer and the fourth layer, the welding current is 120A, the welding voltage is 13V, and the welding speed is 70 m/min; the interlayer temperature was 250 ℃.
The welding process in the embodiment is adopted to weld the water wall pipe, and the mechanical property of the welded joint is detected, and the result is as follows:
example 4:
the water wall tube is a T23 tube with the specification of
The gap between the two openings is 3 mm; the preheating temperature is 200 ℃; the butt joint is welded in four layers; when the first layer of argon arc welding backing welding is carried out, the welding thickness is 3mm, the welding current is 106A, the welding voltage is 12V, and the welding speed is 62 mm/min; when the argon arc welding filling welding of the second layer is carried out, the welding thickness is 2.5mm, the welding current is 108A, the welding voltage is 12V, and the welding speed is 50 mm/min; when the argon arc welding cover surface welding is carried out on the third layer and the fourth layer, the welding current is 116A, the welding voltage is 13V, and the welding speed is 65 m/min; the interlayer temperature was 350 ℃.
The welding process in the embodiment is adopted to weld the water wall pipe, and the mechanical property of the welded joint is detected, and the result is as follows:
from the above, in the welding process of the water wall tube for field installation of the tower boiler, according to the embodiment of the invention, under the condition of poor welding position in a construction site, by controlling the process parameters of the butt joint, such as the butt gap, the preheating temperature, the welding current, the welding voltage, the welding speed and the like, when the butt joint of the T23 tube is subjected to argon arc welding bottoming welding, argon gas protection does not need to be filled in the tube, and the welding quality of the butt joint can be ensured.
Claims (10)
1. A welding process for the water-cooled wall tube used for on-site installation of tower boiler features that said water-cooled wall tube is T23 tube
Or
The method is characterized by comprising the following steps:
s1, removing impurities in the groove of the water wall tube and the range of 10-15 mm on two sides of the inner wall and the outer wall until the water wall tube is exposed out of metallic luster;
s2, assembling the water wall tubes, adjusting the opening clearance of the water wall tubes to be 2.5-3.5 mm, and then welding the butted water wall tubes;
s3, preheating a butt joint of the water wall tube before welding, wherein the preheating temperature is 150-200 ℃;
s4, welding at least three layers of butt joints; the first layer is argon arc welding backing welding, the water wall tube is not filled with argon for protection, the welding current is 100-110A, the welding voltage is 11-13V, and the welding speed is 55-65 mm/min;
the second layer is argon arc welding filling welding, the welding current is 105-115A, the welding voltage is 12-13V, and the welding speed is 45-55 mm/min;
and the other layers are subjected to cover surface welding by adopting argon arc welding or manual arc welding, the welding current is 110-120A, the welding voltage is 12-13V, and the welding speed is 55-70 mm/min.
2. The welding process for the water wall tubes during the field installation of the tower boiler according to claim 1, wherein the interlayer temperature during the welding of each butt joint is 150-350 ℃.
3. The welding process for the water wall tubes during the field installation of the tower boiler according to claim 1 or 2, wherein the welding thickness of the first layer is 2.5-3 mm.
4. The welding process for the water wall tube during the field installation of the tower boiler according to claim 3, wherein the welding thickness of the second layer is 1.5-2.5 mm.
5. The process of claim 1 or 2, wherein the outside diameter of the waterwall tubes is
During welding, backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and three separation points, namely A, B, C, are sequentially arranged at intervals in the circumferential direction of each butt joint; the first welding section starts welding from the position of the A point and finishes welding to the position of the B point; the second welding section starts welding from the position of the C point and finishes welding to the position of the A point; and the third welding section starts welding from the position of the C point and finishes welding to the position of the B point.
6. The process of claim 5, wherein the length of the weld between AB is LABLength of the welded segment between CAs is LCALength of the solder segment between CBs is LCB(ii) a Wherein L isAB<LCA，LCA＝LCB。
7. The process of claim 6, wherein L is LCA＝4×LAB。
8. The welding process for water wall tubes during field installation of a tower boiler according to claim 1 or 2, wherein the outer diameter of the water wall tubes is measured as the outer diameter of the water wall tubesIs composed of
During welding, backing welding of each butt joint is segmented welding along the circumferential direction of the butt joint, and five separation points, namely D, E, F, G, H, are sequentially arranged at intervals in the circumferential direction of each butt joint; the first welding section starts welding from the position of a D point and finishes welding to the position of an E point; the second welding section starts welding from the position of the D point and finishes welding to the position of the H point; the third welding section starts welding from the position of the E point and finishes welding to the position of the F point; the fourth welding section starts welding from the G point position and finishes welding to the F point position; and the fifth welding section starts welding from the G point position and finishes welding to the H point position.
9. The process of claim 8, wherein the length of the weld between DE is LDELength of the welded segment between DH is LDHAnd the length of the welding section between EF is LEFAnd the length of the welding section between GF is LGFThe length of the welding section between GH is LGH(ii) a Wherein L isDE<LDH<LGH，LDH＝LEF，LGH＝LGF。
10. The process of claim 9, wherein L is LGH＝2.5×LDH，LDH＝1.5×LDE。
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