Welding process of 12Cr1MoV high-pressure pipeline CO2 semiautomatic or automatic gas shielded welding

A gas shielded welding, 12cr1mov technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of high labor intensity of welders, low welding efficiency, non-fusion, etc., and achieve a high pass rate of weld flaw detection , The effect of stable welding quality

Inactive Publication Date: 2010-10-06
中国石化集团第五建设公司
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AI Technical Summary

Problems solved by technology

[0002] At present, 12Cr1MoV high-pressure pipelines are generally welded by manual tungsten argon arc welding and electrode arc welding. With the increase of production capacity of China's petrochemical equipment, the high-temperature and high-pressure large-diameter 12Cr1MoV thick-walled pipelines of

Method used

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  • Welding process of 12Cr1MoV high-pressure pipeline CO2 semiautomatic or automatic gas shielded welding
  • Welding process of 12Cr1MoV high-pressure pipeline CO2 semiautomatic or automatic gas shielded welding

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Example Embodiment

[0015] 12Cr1MoV high pressure pipeline CO 2 The detailed steps of the semi-automatic or automatic gas shielded welding process are as follows:

[0016] 1. Take the 12Cr1MoV high pressure tube of φ273×18mm, such as figure 1 The groove is processed in the shown groove form, the included angle of the groove is 55-60°, the blunt edge p is 0.5-1.0mm, and the gap b between the welding end faces of the two steel pipes is 2.0-3.0mm.

[0017] 2. Use the magnetic powder surface nondestructive testing method to detect the groove surface. If there is no crack, it is qualified, and clean up the dirt within 50-100mm of the groove surface of the two-phase welded steel pipe and the edges on both sides of the fracture;

[0018] 3. Fix the two-phase welded steel pipe with a fixture.

[0019] 4. The heating can be heated by flame, heating furnace or caterpillar, and thermal insulation cotton is used to preheat the joint. The preheating range is 3δ from the edge of the groove (δ- is the wall thickness of...

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Abstract

The invention relates to a welding process of 12Cr1MoV high-pressure pipeline CO2 semiautomatic or automatic gas shielded welding, which comprises the following steps of: processing two welded steel pipes into a V-shaped bevel, and fixing the two welded steel pipes by a clamp; heating by an electric heater, preserving heat through heat-preserving cotton, and preheating a joint; immediately carrying out pairing and positioned welding on the welded joint; carrying out manual tungsten argon arc welding priming coat welding by using a solid welding wire TIG-R31; keeping the interlayer temperature between 200 DEG C and 300 DEG C, and carrying out multilayer multi-pass welding by adopting melting pole automatic or semiautomatic CO2 gas shielded welding; and carrying out heat processing after welding. The welding efficiency of the invention is 2-3 times that of welding rod arc welding, and the welding cost is 50% of that of the welding rod arc welding; the qualified rate of welding seam flaw detection is high, and the welding quality is stable.

Description

Technical field [0001] The invention relates to the field of welding, in particular to the technical field of low-alloy heat-resistant steel welding. Background technique [0002] At present, 12Cr1MoV high-pressure pipelines are generally welded by manual tungsten arc welding bottoming and electrode arc welding. As the production capacity of China's petrochemical equipment increases, the high-temperature, high-pressure large-diameter 12Cr1MoV thick-walled pipelines for the supporting power system equipment The increase in number, the low welding efficiency of this welding process, the high labor intensity of the welder, and the unstable welding quality, are prone to welding defects such as weld pores, slag inclusion, non-fusion, local cracks and penetration. Summary of the invention [0003] The purpose of the present invention is to overcome the problems existing in the prior art and provide a 12Cr1MoV high-pressure pipeline CO 2 Semi-automatic or automatic gas shielded welding w...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/16B23K9/235B23K103/08
Inventor 钱德厚王永红
Owner 中国石化集团第五建设公司
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