CN102489888B - Welding method for high-strength steel truss-type cantilever crane - Google Patents
Welding method for high-strength steel truss-type cantilever crane Download PDFInfo
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- CN102489888B CN102489888B CN 201110385526 CN201110385526A CN102489888B CN 102489888 B CN102489888 B CN 102489888B CN 201110385526 CN201110385526 CN 201110385526 CN 201110385526 A CN201110385526 A CN 201110385526A CN 102489888 B CN102489888 B CN 102489888B
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Abstract
The invention discloses a welding method for a high-strength steel truss-type cantilever crane. A main chord tube and a branch tube which are used as main parts of the high-strength steel truss-type cantilever crane are high-strength Q620E steel pipes. Feeding, open phase transversal and beveled edges of the steel pipes are cut and formed at one time by using a three-dimensional full-automatic numerical control steel pipe flame cutter. The main chord tube and the branch tube which are spliced are fixed by a tool plate. After local preheating, symmetrical welding and welding from the middle toboth sides and from bottom to top are adopted, flux-cored arc welding (FCAW) is adopted during welding and the arc is struck inside the beveled edge of a workpiece. The method provided by the invention not only ensures the welding quality of the high-strength steel truss-type cantilever crane with attractive appearance of welding lines, but also is simple and convenient to manufacture, is easy tocontrol welding deformation and has low welding cost.
Description
Technical field
The present invention relates to a kind of welding method, be specifically related to the welding method that a kind of critical piece adopts high-strength steel Q620E steel pipe manufacturing high-strength steel truss-like jib.
Background technology
Along with expanding economy, increasing goliath is used widely, and jib is parts important in such crane in the derrick crane, large-scale derrick crane generally adopts the truss-like jib, the characteristics of its maximum are that jib is in light weight, if jib can alleviate its deadweight, in fact just can increase its lifting capacity, so have very important significance.The jib of large-scale derrick crane is stressed bigger, and stressed complexity, and existing lift heavy load also has shock loading, wind load etc., so the manufacturing of jib is had relatively high expectations, and jib is steel construction, so to welding quality requirement height.Past is because the influence of weld horizontal and welding process factor etc., general low-alloy steel such as the Q345 of adopting, these material good welding performance, weldquality guarantees easily, but the jib weight of making still lays particular stress on, if adopt high-strength steel such as Q620E, jib will alleviate greatly, making large-scale crane becomes possibility, for the ocean platform crane of complete machine quality requirement strictness, has great importance especially.
At present, the welding of high strength Q620E steel pipe truss formula jib, still blank at home, the welding of similar material jib is only arranged, as WDB620, the intensity of material is hanged down 100MPa, perhaps similar high-intensity box-structure, adopt common welding technique, the welding cost height, welding efficiency is low.
Summary of the invention
The welding method that the purpose of this invention is to provide a kind of high strength Q620E steel pipe manufacturing truss-like jib, this method can not only guarantee the welding quality of jib, and simple for production, and welding deformation is easy to control, can efficient, the high-quality welding of finishing jib, and welding cost is low.
The objective of the invention is to realize in the following manner; A kind of welding method of high-strength steel truss-like jib comprises following processing step: the 1. blanking of main chord tube and arm, bevel; 2. put monolithic ground sample, make moulding bed; 3. main chord tube splicing, correction, flaw detection; 4. carry out burst at moulding bed and make, sample is assembled to each arm on the main chord tube over the ground; 5. put generally sample, the base area sample is made overall moulding bed; 6. make the middle part three dimensional unit; 7. parts such as jib head, jib afterbody, pulley support are adorned respectively the weldering and eliminate stress; It is characterized in that: main chord tube and arm adopt high strength steel pipe, its blanking, open intersection and groove all adopts excision forming of cutting machine; The splicing of main chord tube and arm is fixed by the frock plate, after the local preheating, employing be symmetrically welded and from the centre to both sides, welding direction from top to bottom welds, during welding, striking in workpiece grooves, welding wire is not swung when downhand welding or overhead welding, and vertical position welding can be swung 10～15mm, continuous welding, postheating.
Described high strength steel pipe is low-alloy Q620E steel pipe, steel pipe thickness 12～20mm;
Described cutting machine adopts three-dimensional full-automatic numerical control steel pipe flame cutting machine, and its cutting torch is the rapid diffusion type, to the distance of workpiece be 10～15mm; The larynx in cutting oxygen hole directly is 0.2～0.3mm; Preheat flame power is 6～8.3L/min, and propane pressure is 35～45kPa, and oxygen pressure is 200～250kPa, and cutting speed is 40～45cm/min.
Described pre-thermal recovery flame gun local preheating, preheat temperature is 120～180 ℃, and interlayer temperature is 120～180 ℃, and pre-heat rating is weld seam and periphery 70～90mm.
Flux cored wire arc welding is adopted in described welding, and gage of wire is 1.0～1.5 cm, and the heat input of welding is 18KJ/cm～24KJ/cm.
Compared with prior art, the present invention has following tangible advantage:
1, three-dimensional full-automatic numerical control steel pipe flame cutting machine is adopted in the cutting of intersection and groove, and its excision forming had both guaranteed the groove quality, saved cost again.
2, adopt frock plate fixation workpiece, do not install horse plate and spot welding on workpiece additional, eliminated formation of crack, guaranteed the welding quality of jib.
3, adopt FCAW, i.e. flux cored wire arc welding, appearance of weld is attractive in appearance, and the low hydrogen welding method is guaranteed welding quality, reduces welding cost, and welding efficiency is higher.
4, pulley support is processed the laggard row welding that puts in place as widget, and postwelding is not processed, and has saved processing cost greatly.
Description of drawings
Fig. 1 is truss-like jib structure schematic diagram of the present invention.
Fig. 2 is that main chord tube of the present invention docks the groove schematic diagram with main chord tube.
Fig. 3 is that the present invention is main chord tube, arm and steel plate bevel for welding schematic diagram.
Fig. 4 main chord tube of the present invention and arm bevel for welding schematic diagram.
Fig. 4 A is A place groove schematic diagram among Fig. 4.
Fig. 4 B is B place groove schematic diagram among Fig. 4.
Fig. 4 C is C place groove schematic diagram among Fig. 4.
Fig. 5 is frock plate fixation workpiece schematic diagram of the present invention.
Fig. 6 is main chord tube of the present invention or arm butt joint tack welding schematic diagram.
Among the figure, jib afterbody 1, main chord tube 2, arm 3, pulley support 4, jib head 5, steel plate 6, frock plate 7, moulding bed 8.
The specific embodiment
Following examples will the invention will be further described by reference to the accompanying drawings.
Embodiment 1:
A kind of welding method of high-strength steel truss-like jib, the critical piece main chord tube 2 of jib and arm 3 adopt high strength steel pipe to make, and concrete processing step is as follows:
1. the blanking of main chord tube 2 and arm 3, open intersection and groove.Main chord tube 2 and arm 3 all adopt high-strength Q620E steel pipe, and this steel pipe is low-alloy high-strength steel, steel pipe thickness 12mm, and excision forming of three-dimensional full-automatic numerical control steel pipe flame cutting machine is all adopted in the cutting of all intersections and groove.The cutting torch of flame cutting adopts 1# divergent bore nozzle (diffused), and cutting torch to the distance of workpiece is 10mm; The larynx in cutting oxygen hole directly is 0.2mm; Preheat flame power is 6L/min; Propane pressure is 35kPa; Oxygen pressure is 200kPa; Cutting speed is 40cm/min.Cutting speed is adjusted according to the thickness of cutting material, guarantees the roughness of cut surface, does not cut breach.Main chord tube 2 docks groove as shown in Figure 2 with main chord tube 2, and bevel angle R1 is 50 ± 5 degree, and welded gaps F1 is 5mm; The groove of main chord tube 2 and steel plate 6 as shown in Figure 3, bevel angle R2 is 50 ± 5 degree, welded gaps F2 is 5mm; The groove of main chord tube 2 and arm 3 as shown in Figure 4.Among Fig. 4, A place groove is shown in Fig. 4 A, and when the setting angle R6 of main chord tube 2 and arm 3 is 150～90 when spending, bevel angle R3 is 45～50 degree; B place groove is shown in Fig. 4 B, and when the setting angle R7 of main chord tube 2 and arm 3 is 90～75 when spending, bevel angle R4 is 45～50 degree; C place groove is shown in Fig. 4 C, and when the setting angle R8 of main chord tube 2 and arm 3 is 75～45 when spending, bevel angle R5 is 30～35 degree.Should clean out after all groove cuttings, groove is neat, and roughness reaches below the 100 μ m.
2. put monolithic ground sample, make moulding bed 7.
3. the splicing of main chord tube 2, correction, flaw detection.Before the welding, adopt fixedly main chord tube 2 of frock plate 7 earlier, as shown in Figure 5, carry out preheating again, pre-thermal recovery flame gun local preheating, preheat temperature is 120 ℃, treat to measure after flame gun is left preheating position 2min, pre-heat rating is weld seam and peripheral 70mm, and interlayer temperature is 120 ℃; Elder generation's tack welding, the position of tack welding is in 10 and 2 positions (hour position on time) of main chord tube 2, length 20 mm, as shown in Figure 6, the high 3mm of weld seam.During welding, adopt be symmetrically welded and from the centre to both sides, welding direction from top to bottom carries out, striking in workpiece grooves, welding wire is not swung when downhand welding or overhead welding, vertical position welding can be swung 10mm, continuous welding, postwelding covers slow cooling with asbestos; Postwelding checks linearity, and undesirable employing hydraulic press is proofreaied and correct, and carries out 100%RT defect detecting test.
4. carry out burst at moulding bed and make, sample is assembled to each arm 3 on the main chord tube 2 over the ground.Assembling and welding process with step 3..
5. put generally sample, the base area sample is made overall moulding bed 7.
6. make the middle part three dimensional unit.Process allowance 100mm is stayed at two ends when making the middle part three dimensional unit, when assembling jib head 5, jib afterbody 1 more over the ground sample cutting surplus can guarantee the length of jib.Assembling and welding process with step 3..
7. jib head 5, jib afterbody 1, the parts such as pulley support 4 that process are adorned weldering respectively.Pulley support 4, welds after machining end face and endoporus put in place as widget, and postwelding is not processed.Assembling and welding process with step 3..
8. all weld seams adopt the mechanical oscillation mode to eliminate stress.
Above-mentioned steps 2., 5. in, the ground sample of emitting is wanted accurately, and reduces the temperature difference as far as possible, must make at moulding bed 7 when making flat section and three dimensional unit, adopts laser transit to put the ground sample, and carries out with evening in the morning as far as possible.It is high that moulding bed 7 precision of making are wanted, and must make at moulding bed when making flat section and three dimensional unit, and moulding bed 7 will check with laser transit.
Above-mentioned steps 3., 4. in, the linearity that participates in the part of main chord tube 2 before the assembling and arm 3 must guarantee, otherwise take the cold school of hydraulic press; The linearity of the main chord tube 2 that splicing is good can check that as the undesirable cold school of hydraulic press of will taking, fit-up gap and groove must adhere to specification, and guaranteeing to satisfy under the prerequisite of design, reduces as far as possible and fills metal.
Above-mentioned steps 3., 4., 6., 7. in, the assemble sequence of whole jib is the splicing of single main chord tube earlier, makes in flakes again, makes medial section then, the pulley support and the aft mount that processing are put in place are at last carried out self-contained again.The welding sequence of whole jib is welding from the middle to both ends, the weld seam of elder generation's weldering and bottom string pipe, and the weld seam of back weldering and top string pipe can reduce welding deformation and welding stress.Flux cored wire arc welding (FCAW) is adopted in all welding, and gage of wire is 1.0 cm, and the heat input of welding is 18KJ/cm.
Embodiment 2:
A kind of welding method of high-strength steel truss-like jib, the critical piece main chord tube 2 of jib and arm 3 adopt high strength steel pipe to make, and concrete processing step is as follows:
7. the blanking of main chord tube 2 and arm 3, open intersection and groove.Main chord tube 2 and arm 3 all adopt high-strength Q620E steel pipe, and this steel pipe is low-alloy high-strength steel, steel pipe thickness 16mm, and excision forming of three-dimensional full-automatic numerical control steel pipe flame cutting machine is all adopted in the cutting of all intersections and groove.The cutting torch of flame cutting adopts 1# divergent bore nozzle (diffused), and cutting torch to the distance of workpiece is 12mm; The larynx in cutting oxygen hole directly is 0.25mm; Preheat flame power is 7.5L/min; Propane pressure is 40kPa; Oxygen pressure is 220kPa; Cutting speed is 42cm/min.Cutting speed is adjusted according to the thickness of cutting material, guarantees the roughness of cut surface, does not cut breach.Main chord tube 2 docks groove as shown in Figure 2 with main chord tube 2, and bevel angle R1 is 50 ± 5 degree, and welded gaps F1 is 6mm; The groove of main chord tube 2 and steel plate 6 as shown in Figure 3, bevel angle R2 is 50 ± 5 degree, welded gaps F2 is 6mm; The groove of main chord tube 2 and arm 3 as shown in Figure 4.Among Fig. 4, A place groove is shown in Fig. 4 A, and when the setting angle R6 of main chord tube 2 and arm 3 is 150～90 when spending, bevel angle R3 is 45～50 degree; B place groove is shown in Fig. 4 B, and when the setting angle R7 of main chord tube 2 and arm 3 is 90～75 when spending, bevel angle R4 is 45～50 degree; C place groove is shown in Fig. 4 C, and when the setting angle R8 of main chord tube 2 and arm 3 is 75～45 when spending, bevel angle R5 is 30～35 degree.Should clean out after all groove cuttings, groove is neat, and roughness reaches below the 100 μ m.
8. put monolithic ground sample, make moulding bed 7.
9. the splicing of main chord tube 2, correction, flaw detection.Before the welding, adopt fixedly main chord tube 2 of frock plate 7 earlier, as shown in Figure 5, carry out preheating again, pre-thermal recovery flame gun local preheating, preheat temperature is 150 ℃, treat to measure after flame gun is left preheating position 2min, pre-heat rating is weld seam and peripheral 80mm, and interlayer temperature is 150 ℃; Elder generation's tack welding, the position of tack welding is in 10 and 2 positions (hour position on time) of main chord tube 2, length 20 mm, as shown in Figure 6, the high 3.5mm of weld seam.During welding, adopt be symmetrically welded and from the centre to both sides, welding direction from top to bottom carries out, striking in workpiece grooves, welding wire is not swung when downhand welding or overhead welding, vertical position welding can be swung 12mm, continuous welding, postwelding covers slow cooling with asbestos; Postwelding checks linearity, and undesirable employing hydraulic press is proofreaied and correct, and carries out 100%RT defect detecting test.
10. carry out burst at moulding bed and make, sample is assembled to each arm 3 on the main chord tube 2 over the ground.Assembling and welding process with step 3..
7. jib head 5, jib afterbody 1, the parts such as pulley support 4 that process are adorned weldering respectively.Pulley support 4, welds after machining end face and endoporus put in place as widget, and postwelding is not processed.Assembling and welding process with step 3..
8. all weld seams adopt the mechanical oscillation mode to eliminate stress.
Above-mentioned steps 2., 5. in, the ground sample of emitting is wanted accurately, and reduces the temperature difference as far as possible, must make at moulding bed 7 when making flat section and three dimensional unit, adopts laser transit to put the ground sample, and carries out with evening in the morning as far as possible.It is high that moulding bed 7 precision of making are wanted, and must make at moulding bed when making flat section and three dimensional unit, and moulding bed 7 will check with laser transit.
Above-mentioned steps 3., 4. in, the linearity that participates in the part of main chord tube 2 before the assembling and arm 3 must guarantee, otherwise take the cold school of hydraulic press; The linearity of the main chord tube 2 that splicing is good can check that as the undesirable cold school of hydraulic press of will taking, fit-up gap and groove must adhere to specification, and guaranteeing to satisfy under the prerequisite of design, reduces as far as possible and fills metal.
Above-mentioned steps 3., 4., 6., 7. in, the assemble sequence of whole jib is the splicing of single main chord tube earlier, makes in flakes again, makes medial section then, the pulley support and the aft mount that processing are put in place are at last carried out self-contained again.The welding sequence of whole jib is welding from the middle to both ends, the weld seam of elder generation's weldering and bottom string pipe, and the weld seam of back weldering and top string pipe can reduce welding deformation and welding stress.Flux cored wire arc welding (FCAW) is adopted in all welding, and gage of wire is 1.2 cm, and the heat input of welding is 21KJ/cm.
Embodiment 3:
A kind of welding method of high-strength steel truss-like jib, the critical piece main chord tube 2 of jib and arm 3 adopt high strength steel pipe to make, and concrete processing step is as follows:
7. jib head 5, jib afterbody 1, the parts such as pulley support 4 that process are adorned weldering respectively.Pulley support 4, welds after machining end face and endoporus put in place as widget, and postwelding is not processed.Assembling and welding process with step 3..
8. all weld seams adopt the mechanical oscillation mode to eliminate stress.
Above-mentioned steps 2., 5. in, the ground sample of emitting is wanted accurately, and reduces the temperature difference as far as possible, must make at moulding bed 7 when making flat section and three dimensional unit, adopts laser transit to put the ground sample, and carries out with evening in the morning as far as possible.It is high that moulding bed 7 precision of making are wanted, and must make at moulding bed when making flat section and three dimensional unit, and moulding bed 7 will check with laser transit.
Above-mentioned steps 3., 4. in, the linearity that participates in the part of main chord tube 2 before the assembling and arm 3 must guarantee, otherwise take the cold school of hydraulic press; The linearity of the main chord tube 2 that splicing is good can check that as the undesirable cold school of hydraulic press of will taking, fit-up gap and groove must adhere to specification, and guaranteeing to satisfy under the prerequisite of design, reduces as far as possible and fills metal.
Above-mentioned steps 3., 4., 6., 7. in, the assemble sequence of whole jib is the splicing of single main chord tube earlier, makes in flakes again, makes medial section then, the pulley support and the aft mount that processing are put in place are at last carried out self-contained again.The welding sequence of whole jib is welding from the middle to both ends, the weld seam of elder generation's weldering and bottom string pipe, and the weld seam of back weldering and top string pipe can reduce welding deformation and welding stress.Flux cored wire arc welding (FCAW) is adopted in all welding, and gage of wire is 1.5 cm, and the heat input of welding is 24KJ/cm.
Adopt the inventive method to realize the welding that the ocean platform of 190t-40m is sling the heavy-duty machine jib, this jib length 40.5m, the biggest lifting capacity is 190t, adopt Q620E high strength truss structure, jib deadweight 32t has saved cost greatly, improve production efficiency, guaranteed product quality.
Claims (5)
1. the welding method of a high-strength steel truss-like jib comprises following processing step: the blanking of main chord tube and arm, bevel; Put monolithic ground sample, make moulding bed; Main chord tube splicing, correction, flaw detection; Carry out burst at moulding bed and make, sample is assembled to each arm on the main chord tube over the ground; Put generally sample, the base area sample is made overall moulding bed; Make the middle part three dimensional unit; With parts such as jib head, jib afterbody, pulley support adorn respectively the weldering and eliminate stress; It is characterized in that: main chord tube (2) and arm (3) adopt high strength steel pipe, its blanking, open intersection and groove adopts excision forming of cutting machine; Main chord tube (2) is fixing by frock plate (7) with the splicing of arm (3), after the local preheating, employing be symmetrically welded and from the centre to both sides, welding direction from top to bottom welds, during welding, striking in workpiece grooves, welding wire is not swung when downhand welding or overhead welding, vertical position welding swing 10～15mm, continuous welding, postheating.
2. according to the welding method of the said a kind of high-strength steel truss-like jib of claim 1, it is characterized in that: described high strength steel pipe is low-alloy Q620E steel pipe, steel pipe thickness 12～20mm.
3. according to the welding method of the said a kind of high-strength steel truss-like jib of claim 1, it is characterized in that: described cutting machine adopts three-dimensional full-automatic numerical control steel pipe flame cutting machine, and its cutting torch is the rapid diffusion type, to the distance of workpiece be 10～15mm; The larynx in cutting oxygen hole directly is 0.2～0.3mm; Preheat flame power is 6～8.3L/min, and propane pressure is 35～45kPa, and oxygen pressure is 200～250kPa, and cutting speed is 40～45cm/min.
4. according to the welding method of the said a kind of high-strength steel truss-like jib of claim 1, it is characterized in that: described pre-thermal recovery flame gun local preheating, preheat temperature is 120～180 ℃, and interlayer temperature is 120～180 ℃, and pre-heat rating is in weld seam and the periphery 70～90mm scope.
5. according to the welding method of the said a kind of high-strength steel truss-like jib of claim 1, it is characterized in that: flux cored wire arc welding is adopted in described welding, and gage of wire is 1.0～1.5 cm, and the heat input of welding is 18KJ/cm～24KJ/cm.
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