CN102357718B - Stainless steel sheet welding method capable of preventing weld cracks - Google Patents
Stainless steel sheet welding method capable of preventing weld cracks Download PDFInfo
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- CN102357718B CN102357718B CN 201110310220 CN201110310220A CN102357718B CN 102357718 B CN102357718 B CN 102357718B CN 201110310220 CN201110310220 CN 201110310220 CN 201110310220 A CN201110310220 A CN 201110310220A CN 102357718 B CN102357718 B CN 102357718B
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Abstract
The invention discloses a stainless steel sheet welding method capable of preventing weld cracks. The method comprises the following steps: preheating a welding place to 80-120 DEG C; melting the surface of a welding bead to be welded by using moderate current tungsten electrode arc; with oxygen or mixed gas of carbon dioxide and argon as active protection gas, performing welding according to the following set technological parameters after a molten pool is formed: welding current I: 115-125A, welding speed V: 110-125 mm/min, arc length L: 4 mm, and flow Q of active protection gas: 14L/min; controlling the length L of a welding seam of each welding rod with length L1 to be in a range that L is not less than 0.75L1 and not larger than L1; and in the welding process, hanging the U-shaped cooper pipes filled with cooling water on the two sides of the welding seam so as to accelerate the cooling of the welding seam while welding. In the invention, by controlling the welding preheating temperature and adding a welding cooling assistant device, the aim of controlling cracks is achieved.
Description
Technical field:
The present invention relates to the automatic soldering method of large-size stainless steel thin plate, particularly a kind of welding method that can prevent the stainless sheet steel of bead crack.
Background technology:
Stainless steel trough body welding is because welding process is all that regional area at weldment carries out, the non-uniform heat flux of this part and cooling process cause the distributed pole of field of welding temperature inhomogeneous, range of temperature is large, the simultaneous phase transformation, make weldment each position produce expansion and contraction in various degree, thereby inevitably produced complicated welding residual stress.The brittle break that residual stress causes producing HOT CRACK FOR WELDING P and cold crack the most easily occurs in welding, and it often can cause weld crack and make that weldment is large quantities of to be scrapped.The reviewer finds in the checkout procedure to the stainless steel trough body weld bond, and there is micro-crack in some weld bond faces of weld, as shown in Figure 4.That the part weld seam also occurs is interrupted, along the longitudinal crack at weld seam center.Crackle mainly appears at the central authorities of welding point, and near being parallel to weld seam, crack length 10-50mm does not wait, and is interrupted to be distributed in the whole piece weld metal zone.Crackle does not exist only in butt weld, is present in angle welding yet.To the eye, crackle linearly, and from the surface to internal extended.Measure its degree of depth with electronics pin hole survey meter, major part is split dark 1-2mm, the direct through crack of some crackles.Under light microscope, observe the crackle form, can see the intergranular crack that expands to of crackle, and be covered with many netted micro-cracks on crackle.Opportunity, position, form and feature according to crackle produces can judge that this crackle is a kind of HOT CRACK FOR WELDING P.
Summary of the invention:
The purpose of this invention is to provide a kind of welding method that prevents the stainless sheet steel of bead crack, the method is between activating gas tungsten argon arc welding method and conventional stainless steel welding method.Adopt moderate electric current tungsten electrode arc will need the welding bead surface melting that welds, and with the mist of oxygen or carbon dioxide and argon gas as active protection gas, weld by the technological parameter of setting after the molten bath forms.In welding process, welding pre-heating temperature is reasonably controlled, and increased with the weldering auxiliary cooling device, control to reach the purpose that crackle produces.
The object of the present invention is achieved like this: a kind of welding method that prevents the stainless sheet steel of bead crack is characterized in that: adopt following steps and technological parameter to make:
1) process groove on a stainless sheet steel to be welded, groove corner cut α is 15 °～30 °, not cutting thickness d is 1/3t～1/2t, and another stainless sheet steel to be welded keeps and the gap h between it is 1/3t～1/2t, and wherein t is the soldering stainless steel gauge of sheet;
2) with welding ketone wiping stainless sheet steel finished surface to be welded, the greasy dirt on surface is removed; Preheating weld to 80～120 ℃;
3) will carry out means of spot welds at interval of 100mm after two soldering stainless steel thin plate splicings and connect, and keep two welding sheet position to fix, the gap between maintenance both is even;
4) with the mist of oxygen or carbon dioxide and argon gas as active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:115～125A, speed of welding v:110～125mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
5) in welding process, the U-shaped copper pipe of interior notes cooling water is hung on weld seam both sides, plays with weldering with accelerating cooling weld seam effect;
6) with after the one side welding, turn polishing cleanings such as the back side being produced welding slag; Then at the commissure finished edge, the groove parameter is: underside groove corner cut α
1Be 15 °～30 °, the joint-cutting depth d
1Be 1/6t～1/3t, width of slit h
1Be 1/4t～1/3t, wherein t is the soldering stainless steel gauge of sheet;
7) according to the above-mentioned the 4th) the step process parameter welds the back side;
8) after the not damaged detection is qualified, be finished product.
Purpose of the present invention can also realize like this: as active protection gas, the technological parameter by following setting after the molten bath forms welds with oxygen, welding current I:115A, speed of welding v:110mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
As active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:125A, speed of welding v:125mm.min with the mist of carbon dioxide and argon gas
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
As active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:120A, speed of welding v:120mm.min with the mist of carbon dioxide and argon gas
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
The invention has the beneficial effects as follows: the present invention passes through the processing of various ways groove, technological parameter are selected, and in welding process, welding pre-heating temperature is reasonably controlled, and increases with the cooling U-shaped pipe servicing unit of weldering, reaches the purpose that the control crackle produces.Welding method of the present invention can satisfy batch production, and welding quality reaches the specification requirement that product is set.Testing result shows, straight weld is estimated weld seam in same surperficial 2m, without obviously difference in height, stand out, S is curved and significantly overlap trace, and the further poor 2mm that is not more than of tool detection weld width.Detect through the nondestructive inspection tester and do not find bead crack.
Description of drawings
Fig. 1 stainless sheet steel butt welding front groove machining sketch chart
Fig. 2 stainless sheet steel butt welding underside groove machining sketch chart
Fig. 3 U-shaped pipe structure for cooling schematic diagram
Fig. 4 weld crack microphoto
The specific embodiment:
The present invention is further described below in conjunction with accompanying drawing.
Certain product is take thickness as 6mm, the cell body that length is welded at the corrosion resistant plate (material 304L) of 1.5～1.8m, and its angle welding length is 2.2m.The polylith gusset is set in cell body, and two ends arrange ring flange or grafting frame etc., complicated structure.The required steel plate maximum length of stainless steel casing can reach 6m, is highly 2.2m, needs to adopt a large amount of straight weld and angle welding, because be loaded with the high-temperature alkaline medium in cell body in working order, the seal that welds is had higher requirement.
Adopt following steps and technological parameter to make:
1) process groove on a stainless sheet steel to be welded, groove corner cut α is 15 °, and not cutting thickness d is 1/3t, and another stainless sheet steel to be welded keeps and the gap h between it is 1/3t, and wherein t is the soldering stainless steel gauge of sheet;
2) with welding ketone wiping stainless sheet steel finished surface to be welded, the greasy dirt on surface is removed; Preheating weld to 80～120 ℃;
3) will carry out means of spot welds at interval of 100mm after two soldering stainless steel thin plate splicings and connect, and keep two welding sheet position to fix, the gap between maintenance both is even;
4) with oxygen as active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:115A, speed of welding v:110mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
5) in welding process, the U-shaped copper pipe of interior notes cooling water is hung on weld seam both sides, plays with weldering with accelerating cooling weld seam effect;
6) with after the one side welding, turn polishing cleanings such as the back side being produced welding slag; Then at the commissure finished edge, the groove parameter is: underside groove corner cut α
1Be 15 °, the joint-cutting depth d
1Be 1/6t, width of slit h
1Be 1/4t, wherein t is the soldering stainless steel gauge of sheet;
7) according to the above-mentioned the 4th) the step process parameter welds the back side;
8) after the not damaged detection is qualified, be finished product.
Postwelding testing result: detect through the nondestructive inspection tester and do not find bead crack, weld seam tolerance dimension qualified.
Embodiment 2
Product type is with embodiment 1, and stainless sheet steel material 304L, thickness are 8mm, and weld length is 6m, is highly 2.2m.
Adopt following steps and technological parameter to make:
1) process groove on a stainless sheet steel to be welded, groove corner cut α is 30 °, and not cutting thickness d is 1/2t, and another stainless sheet steel to be welded keeps and the gap h between it is 1/2t, and wherein t is the soldering stainless steel gauge of sheet;
2) with welding ketone wiping stainless sheet steel finished surface to be welded, the greasy dirt on surface is removed; Preheating weld to 80～120 ℃;
3) will carry out means of spot welds at interval of 100mm after two soldering stainless steel thin plate splicings and connect, and keep two welding sheet position to fix, the gap between maintenance both is even;
4) with the mist of carbon dioxide and argon gas as active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:125A, speed of welding v:125mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
5) in welding process, the U-shaped copper pipe of interior notes cooling water is hung on weld seam both sides, plays with weldering with accelerating cooling weld seam effect;
6) with after the one side welding, turn polishing cleanings such as the back side being produced welding slag; Then at the commissure finished edge, the groove parameter is: underside groove corner cut α
1Be 30 °, the joint-cutting depth d
1Be 1/3t, width of slit h
1Be 1/3t, wherein t is the soldering stainless steel gauge of sheet;
7) according to the above-mentioned the 4th) the step process parameter welds the back side;
8) after the not damaged detection is qualified, be finished product.
Postwelding testing result: detect through the nondestructive inspection tester and do not find bead crack, weld seam tolerance dimension qualified.
Embodiment 3
Product type is with embodiment 1, and stainless sheet steel material 304L, thickness are 6mm, and weld length is 6m, is highly 2.2m.
Adopt following steps and technological parameter to make:
1) process groove on a stainless sheet steel to be welded, groove corner cut α is 20 °, and not cutting thickness d is 1/3t, and another stainless sheet steel to be welded keeps and the gap h between it is 1/3t, and wherein t is the soldering stainless steel gauge of sheet;
2) with welding ketone wiping stainless sheet steel finished surface to be welded, the greasy dirt on surface is removed; Preheating weld to 80～120 ℃;
3) will carry out means of spot welds at interval of 100mm after two soldering stainless steel thin plate splicings and connect, and keep two welding sheet position to fix, the gap between maintenance both is even;
4) with the mist of oxygen or carbon dioxide and argon gas as active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:120A, speed of welding v:115mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
5) in welding process, the U-shaped copper pipe of interior notes cooling water is hung on weld seam both sides, plays with weldering with accelerating cooling weld seam effect;
6) with after the one side welding, turn polishing cleanings such as the back side being produced welding slag; Then at the commissure finished edge, the groove parameter is: underside groove corner cut α
1Be 20 °, the joint-cutting depth d
1Be 1/3t, width of slit h
1Be 1/3t, wherein t is the soldering stainless steel gauge of sheet;
7) according to the above-mentioned the 4th) the step process parameter welds the back side;
8) after the not damaged detection is qualified, be finished product.
Postwelding testing result: detect through the nondestructive inspection tester and do not find bead crack, weld seam tolerance dimension qualified.
Claims (4)
1. welding method that prevents the stainless sheet steel of bead crack is characterized in that: adopt following steps and technological parameter to make:
1) process groove on a stainless sheet steel to be welded, groove corner cut α is 15 °～30 °, not cutting thickness d is 1/3t～1/2t, and another stainless sheet steel to be welded keeps and the gap h between it is 1/3t～1/2t, and wherein t is the soldering stainless steel gauge of sheet;
2) with welding ketone wiping stainless sheet steel finished surface to be welded, the greasy dirt on surface is removed; Preheating weld to 80～120 ℃;
3) will carry out means of spot welds at interval of 100mm after two soldering stainless steel thin plate splicings and connect, and keep two welding sheet position to fix, the gap between maintenance both is even;
4) with oxygen or with the mist of carbon dioxide and argon gas as active protection gas, the technological parameter by following setting after the molten bath forms welds, welding current I:115～125A, speed of welding v:110～125mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope;
5) in welding process, the U-shaped copper pipe of interior notes cooling water is hung on weld seam both sides, plays with weldering with accelerating cooling weld seam effect;
6) with after the one side welding, turn polishing cleanings such as the back side being produced welding slag; Then at the commissure finished edge, the groove parameter is: underside groove corner cut α
1Be 15 °～30 °, the joint-cutting depth d
1Be 1/6t～1/3t, width of slit h
1Be 1/4t～1/3t, wherein t is the soldering stainless steel gauge of sheet;
7) according to the above-mentioned the 4th) the step process parameter welds the back side;
8) after the not damaged detection is qualified, be finished product.
2. the welding method that prevents the stainless sheet steel of bead crack according to claim 1; it is characterized in that: with oxygen as active protection gas; technological parameter by following setting after the molten bath forms welds, welding current I:115A, speed of welding v:110mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope.
3. the welding method that prevents the stainless sheet steel of bead crack according to claim 1; it is characterized in that: with the mist of carbon dioxide and argon gas as active protection gas; technological parameter by following setting after the molten bath forms welds; welding current I:125A, speed of welding v:125mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope.
4. the welding method of stainless sheet steel according to claim 1; it is characterized in that: with the mist of carbon dioxide and argon gas as active protection gas; technological parameter by following setting after the molten bath forms welds, welding current I:120A, speed of welding v:120mm.min
-1, arc length L:4mm, active protection gas flow Q:14L.min
-1The fusion length L that every root bead bar length L 1 is welded out is controlled in 0.75L1≤L≤L1 scope.
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| CN104526129A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | Tungsten inert gas spot welding process of steel plate with thickness of 4mm |
| CN104588847A (en) * | 2014-11-27 | 2015-05-06 | 芜湖中集瑞江汽车有限公司 | Consumable electrode mixed gas shielded arc welding process for steel plate with thickness being 8-12 mm |
| CN104475939A (en) * | 2014-11-27 | 2015-04-01 | 芜湖中集瑞江汽车有限公司 | Consumable electrode mixed gas arc welding process of 6mm-thickness steel plates |
| CN104493340A (en) * | 2014-11-27 | 2015-04-08 | 芜湖中集瑞江汽车有限公司 | TIG (tungsten inert gas) shielded welding process of 2mm thick steel plates |
| CN104439649A (en) * | 2014-11-27 | 2015-03-25 | 芜湖中集瑞江汽车有限公司 | 6 mm-thick steel plate tungsten inert gas shielded welding process |
| JP6499557B2 (en) * | 2015-09-08 | 2019-04-10 | 日新製鋼株式会社 | Welding method for austenitic stainless steel sheet |
| CN112171010B (en) * | 2020-10-09 | 2021-06-04 | 昆山宝锦激光拼焊有限公司 | Measure entrance to a cave size and welding equipment |
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| CN101195187A (en) * | 2007-12-20 | 2008-06-11 | 山东大学 | Iron and aluminum intermetallic compound and steel impulse fusion welding method |
| CN101549430A (en) * | 2009-05-08 | 2009-10-07 | 山东大学 | Tungsten electrode argon arc welding technology of zinc base alloy |
| JP2009233691A (en) * | 2008-03-26 | 2009-10-15 | Taiyo Nippon Sanso Corp | Plasma welding process and outer gas for use in plasma welding process |
| CN101693328A (en) * | 2009-10-26 | 2010-04-14 | 浙江大地钢结构有限公司 | Stainless steel sheet welding method capable of controlling deformation |
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2011
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Patent Citations (5)
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| US4816639A (en) * | 1987-07-20 | 1989-03-28 | Nkk Corporation | Automatic arc-welding method |
| CN101195187A (en) * | 2007-12-20 | 2008-06-11 | 山东大学 | Iron and aluminum intermetallic compound and steel impulse fusion welding method |
| JP2009233691A (en) * | 2008-03-26 | 2009-10-15 | Taiyo Nippon Sanso Corp | Plasma welding process and outer gas for use in plasma welding process |
| CN101549430A (en) * | 2009-05-08 | 2009-10-07 | 山东大学 | Tungsten electrode argon arc welding technology of zinc base alloy |
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