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Thick pipe welding process of high-strength steel

A welding process, high-strength steel technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of pipe fittings that are difficult to meet quality and efficiency requirements, easy to generate pores, cracks, slag inclusions, etc. The welding process cycle, the welding one-time forming is good, and the effect of solving welding problems

Inactive Publication Date: 2017-02-22
JIANGXI HONGDU AVIATION IND GRP
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Problems solved by technology

[0002] In the process of processing and manufacturing thick plate high-strength steel, thick tube welding is a difficult problem in manual welding. Generally, argon arc welding is used as the base and arc welding is used for filling. Manual thick tube welding is prone to produce pores, cracks, Defects such as slag inclusions, there are problems such as repeated cleaning of slag inclusions in the coating, repeated preheating and tempering before welding, which makes it difficult to weld pipe fittings with high quality and efficiency requirements

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  • Thick pipe welding process of high-strength steel
  • Thick pipe welding process of high-strength steel
  • Thick pipe welding process of high-strength steel

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[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] A thick tube welding process for high-strength steel, such as figure 1 As shown, the specific steps are as follows:

[0025] element C Si mn S P standard value 0.28～0.34 0.90～1.20 0.80～1.10 ≤0.025 ≤0.025 element Mo Cu Cr Ni Cep standard value ≤0.025 0.80～1.10 ≦0.030 0.71(%)

[0026] Cleaning before welding: use dry river sand (77~15.4 mesh, air pressure ≤0.5MPa) to blow sand on the surface of the overall workpiece, the distance from the nozzle to the surface of the overall workpiece is 150~300mm, and prohibit the nozzle from being perpendicular to the surface of the overall workpiece; then use Dip a clean rag with alcohol or acetone to clean the surface of the welding wire until the...

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Abstract

A thick pipe welding process of high-strength steel comprises the following steps: firstly, performing butt joint on two workpieces to be welded according to welding process requirements and forming an integrated workpiece with symmetrical grooves after butt joint; secondly, cleaning the surface of the integrated workpiece before welding, preheating the integrated workpiece, and performing multi-layer multi-channel welding, including a TIG base layer, a TIG filling layer and a TIG covering layer, on the integrated workpiece after preheating is finished; and finally, putting the welded integrated workpiece into a tempering furnace, and performing tempering after welding and then cooling to finish thick pipe welding of the high-strength steel. By the thick pipe welding process of the high-strength steel, a high-strength steel thick plate is subjected to automatic multi-layer swinging wire filling TIG welding and the welding problem is effectively solved, so that the welding efficiency and the stability are high, the one-time welding formation is good, the first-class weld joint requirements of the workpieces are met, and the high-speed and high-efficiency welding effect is guaranteed; meanwhile, the process flow is simplified, the welding quality is improved and the welding processing cycle is shortened, so that the production cost is saved, the labor intensity of workers is reduced and the working environment is improved.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a thick tube welding technology of high-strength steel. Background technique [0002] In the process of processing and manufacturing thick plate high-strength steel, thick tube welding is a difficult problem in manual welding. Generally, argon arc welding is used as the base and arc welding is used for filling. Manual thick tube welding is prone to produce pores, cracks, Defects such as slag inclusions, there are problems such as repeated cleaning of slag inclusions in the drug skin, repeated preheating and tempering before welding, which makes it difficult to weld pipe fittings with high quality and efficiency requirements. Contents of the invention [0003] The technical problem solved by the present invention is to provide a high-strength steel thick tube welding process to solve the above-mentioned shortcomings in the background technology. [0004] The technica...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235B23K33/00
CPCB23K9/167B23K9/235B23K33/004B23K2101/06B23K2103/04
Inventor 周继强王丽峰涂国栋原鹏飞宗进宋洁陈磊鲍志娟汪琦陈鸣辉马晶晶袁磊齐洪豪谢训鹏吴文斌
Owner JIANGXI HONGDU AVIATION IND GRP
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