CN102357718A - 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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- CN102357718A CN102357718A CN2011103102200A CN201110310220A CN102357718A CN 102357718 A CN102357718 A CN 102357718A CN 2011103102200 A CN2011103102200 A CN 2011103102200A CN 201110310220 A CN201110310220 A CN 201110310220A CN 102357718 A CN102357718 A CN 102357718A
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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 to produce the stainless sheet steel of bead crack.
Background technology:
Stainless steel trough body welding is because welding process all is a regional area at weldment carries out; The inhomogeneous heating of this part and the process of cooling cause the distributed pole of field of welding temperature inhomogeneous; Range of temperature is big; The simultaneous phase transformation makes each position of weldment produce expansion and contraction in various degree, thereby has inevitably produced complicated welding residual stress.Residual stress causes producing brittle break the easiest generation in welding of HOT CRACK FOR WELDING P and cold crack, and it causes weld crack through regular meeting and makes that weldment is large quantities of to be scrapped.The reviewer finds that in the checkout procedure to the stainless steel trough body weld bond there is micro-crack in some weld bond faces of weld, and are 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 being distributed in the whole piece weld metal zone.Crackle does not exist only in butt weld, is present in the 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 the crackle that has.Under light microscope, observe the crackle form, can see the intergranular crack that expands to of crackle, and on crackle, be covered with many netted micro-cracks.According to opportunity, position, form and the characteristic that 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 to produce the stainless sheet steel of bead crack, this method is between activating gas tungsten argon arc welding method and conventional stainless steel welding method.The welding bead surface melting that adopts moderate electric current tungsten electrode arc to weld, and with the mist of oxygen or carbon dioxide and argon gas as active protection gas, form the back in the molten bath and weld by the technological parameter of setting.In welding process, welding pre-heating temperature is reasonably controlled, and increased, to reach the purpose that the control crackle produces with weldering cooling servicing unit.
The objective of the invention is to realize like this: a kind of welding method that prevents to produce the stainless sheet steel of bead crack is characterized in that: adopt following steps and technological parameter making:
1) on a stainless sheet steel to be welded, processes groove; 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), the greasy dirt on surface is removed with welding ketone wiping stainless sheet steel finished surface to be welded; Preheating weld to 80～120 ℃;
3) will treat behind the two soldering stainless steel thin plate splicings that every interval 100mm carries out means of spot welds and connects, and keep two welding sheet position to fix, and keep the gap between the two even;
4) with the mist of oxygen or carbon dioxide and argon gas as active protection gas, form the back in the molten bath and weld welding current I:115～125A, speed of welding v:110～125mm.min by the technological parameter of following setting
-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 the welding process, the U-shaped copper pipe of interior notes cooling water is hung on the weld seam both sides, plays with weldering with quickening the effect of cooling weld seam;
6) after will one side welding, turn polishing cleanings such as the back side being produced welding slag; The finished edge in the commissure then, 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.
The object of the invention can also be realized like this:, form back technological parameter by following setting in the molten bath and weld welding current I:115A, speed of welding v:110mm.min as active protection gas with oxygen
-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;
, form the back in the molten bath and weld welding current I:125A, speed of welding v:125mm.min as active protection gas with the mist of carbon dioxide and argon gas by the technological parameter of following setting
-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;
, form the back in the molten bath and weld welding current I:120A, speed of welding v:120mm.min as active protection gas with the mist of carbon dioxide and argon gas by the technological parameter of following setting
-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 weldering and cools off U-shaped pipe servicing unit, reaches the purpose that the control crackle produces.Welding method of the present invention can satisfy batch process, and welding quality reaches the specification requirement that product is set.Testing result shows that straight weld is estimated weld seam in same surperficial 2m, and it is curved and significantly overlap trace not have obvious difference in height, stand out, S, and further tool detection weld width difference is not more than 2mm.Do not find bead crack through the detection of nondestructive inspection tester.
Description of drawings
Fig. 1 stainless sheet steel butt welding front groove processing sketch map
Fig. 2 stainless sheet steel butt welding underside groove processing sketch map
Fig. 3 U-shaped pipe structure for cooling sketch map
Fig. 4 weld crack microphoto
The specific embodiment:
Below in conjunction with accompanying drawing the present invention is further specified.
Certain product is 6mm with thickness, 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 the cell body, and two ends are provided with ring flange or grafting frame etc., structure more complicated.The required steel plate maximum length of stainless steel casing can reach 6m, highly is 2.2m, needs to adopt a large amount of straight weld and angle welding, because be loaded with the high-temperature alkaline medium in the cell body in working order, the seal that welds is had higher requirement.
Adopt following steps and technological parameter to make:
1) on a stainless sheet steel to be welded, process groove, 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), the greasy dirt on surface is removed with welding ketone wiping stainless sheet steel finished surface to be welded; Preheating weld to 80～120 ℃;
3) will treat behind the two soldering stainless steel thin plate splicings that every interval 100mm carries out means of spot welds and connects, and keep two welding sheet position to fix, and keep the gap between the two even;
4) with oxygen as active protection gas, form the back in the molten bath and weld welding current I:115A, speed of welding v:110mm.min by the technological parameter of following setting
-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 the welding process, the U-shaped copper pipe of interior notes cooling water is hung on the weld seam both sides, plays with weldering with quickening the effect of cooling weld seam;
6) after will one side welding, turn polishing cleanings such as the back side being produced welding slag; The finished edge in the commissure then, 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.
The postwelding testing result: do not find bead crack through the detection of nondestructive inspection tester, weld seam tolerance dimension index is qualified.
Embodiment 2
Product type is with embodiment 1, and stainless sheet steel material 304L, thickness are 8mm, and weld length is 6m, highly is 2.2m.
Adopt following steps and technological parameter to make:
1) on a stainless sheet steel to be welded, process groove, 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), the greasy dirt on surface is removed with welding ketone wiping stainless sheet steel finished surface to be welded; Preheating weld to 80～120 ℃;
3) will treat behind the two soldering stainless steel thin plate splicings that every interval 100mm carries out means of spot welds and connects, and keep two welding sheet position to fix, and keep the gap between the two even;
4) with the mist of carbon dioxide and argon gas as active protection gas, form the back in the molten bath and weld welding current I:125A, speed of welding v:125mm.min by the technological parameter of following setting
-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 the welding process, the U-shaped copper pipe of interior notes cooling water is hung on the weld seam both sides, plays with weldering with quickening the effect of cooling weld seam;
6) after will one side welding, turn polishing cleanings such as the back side being produced welding slag; The finished edge in the commissure then, 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.
The postwelding testing result: do not find bead crack through the detection of nondestructive inspection tester, weld seam tolerance dimension index is qualified.
Embodiment 3
Product type is with embodiment 1, and stainless sheet steel material 304L, thickness are 6mm, and weld length is 6m, highly is 2.2m.
Adopt following steps and technological parameter to make:
1) on a stainless sheet steel to be welded, process groove, 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), the greasy dirt on surface is removed with welding ketone wiping stainless sheet steel finished surface to be welded; Preheating weld to 80～120 ℃;
3) will treat behind the two soldering stainless steel thin plate splicings that every interval 100mm carries out means of spot welds and connects, and keep two welding sheet position to fix, and keep the gap between the two even;
4) with the mist of oxygen or carbon dioxide and argon gas as active protection gas, form the back in the molten bath and weld welding current I:120A, speed of welding v:115mm.min by the technological parameter of following setting
-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 the welding process, the U-shaped copper pipe of interior notes cooling water is hung on the weld seam both sides, plays with weldering with quickening the effect of cooling weld seam;
6) after will one side welding, turn polishing cleanings such as the back side being produced welding slag; The finished edge in the commissure then, 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.
The postwelding testing result: do not find bead crack through the detection of nondestructive inspection tester, weld seam tolerance dimension index is qualified.
Claims (4)
1. welding method that prevents to produce the stainless sheet steel of bead crack is characterized in that: adopt following steps and technological parameter making:
1) on a stainless sheet steel to be welded, processes groove; 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), the greasy dirt on surface is removed with welding ketone wiping stainless sheet steel finished surface to be welded; Preheating weld to 80～120 ℃;
3) will treat behind the two soldering stainless steel thin plate splicings that every interval 100mm carries out means of spot welds and connects, and keep two welding sheet position to fix, and keep the gap between the two even;
4) with the mist of oxygen or carbon dioxide and argon gas as active protection gas, form the back in the molten bath and weld welding current I:115～125A, speed of welding v:110～125mm.min by the technological parameter of following setting
-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 the welding process, the U-shaped copper pipe of interior notes cooling water is hung on the weld seam both sides, plays with weldering with quickening the effect of cooling weld seam;
6) after will one side welding, turn polishing cleanings such as the back side being produced welding slag; The finished edge in the commissure then, 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 to produce the stainless sheet steel of bead crack according to claim 1; It is characterized in that: with oxygen as active protection gas; Form back technological parameter in the molten bath and weld welding current I:115A, speed of welding v:110mm.min by following setting
-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 to produce 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; Forming back technological parameter by following setting in the molten bath 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; Form back technological parameter in the molten bath and weld welding current I:120A, speed of welding v:120mm.min by following setting
-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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN108025385A (en) * | 2015-09-08 | 2018-05-11 | 日新制钢株式会社 | The welding method of austenite stainless steel plate |
| CN112171010A (en) * | 2020-10-09 | 2021-01-05 | 磐安字根电子科技有限公司 | Measure entrance to a cave size and welding equipment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN108025385A (en) * | 2015-09-08 | 2018-05-11 | 日新制钢株式会社 | The welding method of austenite stainless steel plate |
| CN112171010A (en) * | 2020-10-09 | 2021-01-05 | 磐安字根电子科技有限公司 | Measure entrance to a cave size and welding equipment |
| 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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| CN102357718B (en) | 2013-06-05 |
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Effective date of registration: 20210127 Address after: 063200 Hebei province Tangshan City Caofeidian District Tang Hai Town West Economic Zone Patentee after: TANGSHAN CAOFEIDIAN DISTR SHOUYAN MACHINERY Co.,Ltd. Address before: No. 302, Hanwang Road, Yanjiao Economic and Technological Development Zone, Sanhe City, Langfang City, Hebei Province 065200 Patentee before: HEBEI SHOUYAN MACHINERY Co.,Ltd. |