CN105983753A - Ordinary carbon structural steel welding process - Google Patents
Ordinary carbon structural steel welding process Download PDFInfo
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- CN105983753A CN105983753A CN201510048837.8A CN201510048837A CN105983753A CN 105983753 A CN105983753 A CN 105983753A CN 201510048837 A CN201510048837 A CN 201510048837A CN 105983753 A CN105983753 A CN 105983753A
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Abstract
The invention discloses an ordinary carbon structural steel welding process which is characterized by including the steps of (1) preparing weld materials, (2) preparing before welding and (3) welding process according to specific requirements; wherein the specific requirements include that two welding guns for welding symmetrical welds on the same plane are spaced by the interval of 0.5-2 meters from front to back; the included angle between a contact tube and the horizontal plane ranges from 30 degrees to 40 degrees; the extension length of a welding wire ranges from 15mm to 25mm; the height of a weld fillet is not smaller than the thickness of a web; the allowable deviation is equal to 0-4mm if the dimension of the weld fillet is not greater than 12mm, and the allowable deviation is equal to 0-5mm if the dimension of the weld fillet is greater than 12mm; to the concaves in surfaces of the welds, within the length range of 25mm, the difference between the maximum number and the minimum number is not greater than 1mm. The ordinary carbon structural steel welding process has the advantages that parameters of different stages are controlled reasonably and strictly, its procedures are normalized, weld stress and deformation are reduced, and mechanical property of welded pipes is improved.
Description
Technical field
The invention belongs to welding procedure field, specifically a kind of carbon structural steel welding procedure.
Background technology
Carbon structural steel has the features such as high intensity, high tenacity and good combination property, is widely used at industrial circle.It is known that the extensively application of any structural metallic materials depends not only on the performance characteristics of himself, and also rely on the progress of solder technology.At present; carbon structural steel welding mainly uses the welding method that submerged-arc welding, gas shielded arc welding etc. are traditional; though having the advantages such as technical maturity, production cost are low, but have that thermal weld stress amount is big, deformation is big, joint is brittle, be easily generated defect and the problem such as welding production efficiency is low.Along with progress and the development of national economy of science and technology, welding quality, production efficiency and the product quality of carbon structural steel is had higher requirement.Traditional welding method the most can not meet the requirement of welding quality and the production efficiency improved constantly and use traditional welding method by time integrally welded for stainless steel pipes, its heat input is wayward, it is easily caused the poor welding quality of product, then poor mechanical property.
Summary of the invention
The deficiency existed in view of prior art, it is an object of the invention to provide a kind of carbon structural steel welding procedure, controls each stage process parameter by strict, it is achieved improve mechanical property after welding.
The technical scheme realizing the object of the invention is as follows:
A kind of carbon structural steel welding procedure, it is characterised in that welding procedure and requirement:
(1) welding material: mother metal is Q235 material；Welding wire is H08Mn2SiA, diameter phi 3.2mm, welding wire surface without rust, without greasy dirt, surface without coming off, solder flux is HJ431, is heated to 250～300 DEG C, then drying and processing before solder flux welding, keeps 2-5 hour；
(2) prepare before weldering: by the rust at place to be welded for workpiece, cut the eliminating impurities such as slag, burr, oil stain, dirt totally, and the seam end face grinder buffing of submerged-arc welding, cleaning will be carried out
Scope should check the assembling of weld seam, the correctness of retaining wall on slope in the 20mm of joint both sides, and whether the angle of weld seam, gradient meet the requirements；
(3) two the welding gun time interval 0.5-2 rice of symmetrical weld seam during welding, in welding approximately the same plane；Ignition tip should be 30～40 ° with the angle of horizontal plane；, electrode extension is 15-25mm；Run-on tab and arc-extinguishing plate should be laid in weld seam two ends, and its length dimension 100mm, its material, thickness, angle are consistent with weldment；
(4) weld seam leg height cannot be less than web thickness, during weld seam fillet weld size≤12mm, it is allowed to fillet weld size deviation 0～4mm, during fillet weld size ＞ 12mm, allowable dimension variation 0～5mm, bead contour should be uniform, should seamlessly transit between welding bead and welding bead and welding bead and base metal；Weld seam maximum height cannot be greater than 2mm with the difference of minimum constructive height in the range of any 50mm weld length, and weld seam Breadth Maximum cannot be greater than 2mm with the difference of minimum widith in the range of any 50mm weld length；Face of weld is concavo-convex, and in any 25mm length, maximum subtracts the difference of minimum and cannot be greater than 1mm；Weld seam does not allows to occur the defect such as crackle, pore, incomplete fusion, undercut, overlap, burn-through, joint be bad；
When drawbacks described above, repair welding to be carried out occurs in weld seam；Described repair method: to single and that diameter is less than φ 0.5 pore, with the direct repair welding of arc welding；Hole diameter is more than φ 0.5, carries out repair welding again after weld metal polishing hollows out at pore；Crackle occurs, the polishing of cracks weld metal must be hollowed out, then carry out repair welding by arc welding.
A kind of carbon structural steel welding procedure of the present invention has technique each stage strict conservative control of parameter, standard process, reduces welding stress and deformation, thus improves the mechanical property after pipeline welding.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:
A kind of carbon structural steel welding procedure, welding procedure and requirement:
(1) welding material: mother metal is Q235 material；Welding wire is H08Mn2SiA, diameter phi 3.2mm, welding wire surface without rust, without greasy dirt, surface without coming off, solder flux is HJ431, is heated to 250～300 DEG C, then drying and processing before solder flux welding, keeps 2-5 hour；
(2) prepare before weldering: by the rust at place to be welded for workpiece, cut the eliminating impurities such as slag, burr, oil stain, dirt totally, and the seam end face grinder buffing of submerged-arc welding, cleaning will be carried out
Scope should check the assembling of weld seam, the correctness of retaining wall on slope in the 20mm of joint both sides, and whether the angle of weld seam, gradient meet the requirements；
(3) two the welding gun time interval 0.5-2 rice of symmetrical weld seam during welding, in welding approximately the same plane；Ignition tip should be 30～40 ° with the angle of horizontal plane；, electrode extension is 15-25mm；Run-on tab and arc-extinguishing plate should be laid in weld seam two ends, and its length dimension 100mm, its material, thickness, angle are consistent with weldment；
(4) weld seam leg height cannot be less than web thickness, during weld seam fillet weld size≤12mm, it is allowed to fillet weld size deviation 0～4mm, during fillet weld size ＞ 12mm, allowable dimension variation 0～5mm, bead contour should be uniform, should seamlessly transit between welding bead and welding bead and welding bead and base metal；Weld seam maximum height cannot be greater than 2mm with the difference of minimum constructive height in the range of any 50mm weld length, and weld seam Breadth Maximum cannot be greater than 2mm with the difference of minimum widith in the range of any 50mm weld length；Face of weld is concavo-convex, and in any 25mm length, maximum subtracts the difference of minimum and cannot be greater than 1mm；Weld seam does not allows to occur the defect such as crackle, pore, incomplete fusion, undercut, overlap, burn-through, joint be bad；
When drawbacks described above, repair welding to be carried out occurs in weld seam；Described repair method: to single and that diameter is less than φ 0.5 pore, with the direct repair welding of arc welding；Hole diameter is more than φ 0.5, carries out repair welding again after weld metal polishing hollows out at pore；Crackle occurs, the polishing of cracks weld metal must be hollowed out, then carry out repair welding by arc welding.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be at the protection domain being defined in the patent claims the most on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment.
Claims (1)
1. a carbon structural steel welding procedure, it is characterised in that welding procedure and requirement:
(1) welding material: mother metal is Q235 material；Welding wire is H08Mn2SiA, diameter phi 3.2mm, welding wire surface without rust, without greasy dirt, surface without coming off, solder flux is HJ431, is heated to 250～300 DEG C before solder flux welding
, then drying and processing, keep 2-5 hour；
(2) prepare before weldering: by the rust at place to be welded for workpiece, cut the eliminating impurities such as slag, burr, oil stain, dirt totally, and the seam end face grinder buffing of submerged-arc welding, cleaning will be carried out
Scope should check the assembling of weld seam, the correctness of retaining wall on slope in the 20mm of joint both sides, and whether the angle of weld seam, gradient meet the requirements；
(3) two the welding gun time interval 0.5-2 rice of symmetrical weld seam during welding, in welding approximately the same plane；Ignition tip should be 30～40 ° with the angle of horizontal plane；, electrode extension is 15-25mm；Run-on tab and arc-extinguishing plate should be laid in weld seam two ends, and its length dimension 100mm, its material, thickness, angle are consistent with weldment；
(4) weld seam leg height cannot be less than web thickness, during weld seam fillet weld size≤12mm, it is allowed to fillet weld size deviation 0～4mm, during fillet weld size ＞ 12mm, allowable dimension variation 0～5mm, bead contour should be uniform, should seamlessly transit between welding bead and welding bead and welding bead and base metal；Weld seam maximum height cannot be greater than 2mm with the difference of minimum constructive height in the range of any 50mm weld length, and weld seam Breadth Maximum cannot be greater than 2mm with the difference of minimum widith in the range of any 50mm weld length；Face of weld is concavo-convex, and in any 25mm length, maximum subtracts the difference of minimum and cannot be greater than 1mm；Weld seam does not allows to occur the defect such as crackle, pore, incomplete fusion, undercut, overlap, burn-through, joint be bad；When drawbacks described above, repair welding to be carried out occurs in weld seam；Described repair method: to single and that diameter is less than φ 0.5 pore, with the direct repair welding of arc welding；Hole diameter is more than φ 0.5, carries out repair welding again after weld metal polishing hollows out at pore；Crackle occurs, the polishing of cracks weld metal must be hollowed out, then carry out repair welding by arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510048837.8A CN105983753A (en) | 2015-01-30 | 2015-01-30 | Ordinary carbon structural steel welding process |
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| CN201510048837.8A CN105983753A (en) | 2015-01-30 | 2015-01-30 | Ordinary carbon structural steel welding process |
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| CN105983753A true CN105983753A (en) | 2016-10-05 |
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| CN201510048837.8A Pending CN105983753A (en) | 2015-01-30 | 2015-01-30 | Ordinary carbon structural steel welding process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106425037A (en) * | 2016-10-13 | 2017-02-22 | 广西大学 | Welding method for special steel sheets for heat exchanger |
| CN106624238A (en) * | 2016-12-15 | 2017-05-10 | 浙江大学 | Method for improving electric contact welding quality consistency |
| CN111545877A (en) * | 2020-05-18 | 2020-08-18 | 江苏联峰实业有限公司 | Welding method of carbon structural steel |
| CN112917299A (en) * | 2021-03-30 | 2021-06-08 | 湛立宁 | Grinding device for internal weld joint of pressure vessel |
-
2015
- 2015-01-30 CN CN201510048837.8A patent/CN105983753A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106425037A (en) * | 2016-10-13 | 2017-02-22 | 广西大学 | Welding method for special steel sheets for heat exchanger |
| CN106624238A (en) * | 2016-12-15 | 2017-05-10 | 浙江大学 | Method for improving electric contact welding quality consistency |
| CN106624238B (en) * | 2016-12-15 | 2019-01-08 | 浙江大学 | A method of improving electric contact welding quality consistency |
| CN111545877A (en) * | 2020-05-18 | 2020-08-18 | 江苏联峰实业有限公司 | Welding method of carbon structural steel |
| CN112917299A (en) * | 2021-03-30 | 2021-06-08 | 湛立宁 | Grinding device for internal weld joint of pressure vessel |
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Application publication date: 20161005 |