12Cr1MoV alloy steel pipe welding method

A 12cr1mov, welding method technology, applied in the field of steel pipe welding, can solve the problems of cracks and penetration of welds

Inactive Publication Date: 2006-08-09
CHINA SIXTH METALLURGICAL CONSTR
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Problems solved by technology

[0003] The purpose of the present invention is to effectively overcome the problem that 12Cr1MoV alloy steel pipes are easily cracked and penetrated under the conditions of high temperature, high pressure and st

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  • 12Cr1MoV alloy steel pipe welding method
  • 12Cr1MoV alloy steel pipe welding method

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[0013] The welding steps of the 12Cr1MoV alloy steel pipe of the present invention are described in detail below:

[0014] 1. The welding surfaces of the welded steel pipes 1 and 2 are machined into a groove form, such as figure 1 As shown, the oblique angle α is 60±3°, the gap c is 2.5-3.0mm, and the welding surface and nearby steel pipes are cleaned of oil, rust and other contaminants.

[0015] 2. Use a fixture to fix the two-phase welded steel pipe.

[0016] 3. Set a heating device such as a crawler heater near the weld to heat the steel pipe near the weld to 250-350℃.

[0017] 4. Heat preservation, and use H08CrMoVA welding wire argon arc welding for bottom welding, such as figure 2 shown at a.

[0018] 5. Manually weld several layers with A242 stainless steel electrode, such as figure 2 As shown in b in the middle, the slag and spatter between the welding layers should be removed, and the welding temperature between the layers should not be lower than 250 °C.

[00...

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Abstract

The invention involves a method of welding 12Cr1MoV alloy steel pipes. Process the welding surfaces of the two pipes into a sloping groove, and clean the welding surfaces and its neighboring area, fix the two pipes which to be welded along using a clamp. Preheat and insulate the pipe area near the weld. First weld the pipes with welding rod H08CrMoVA, then weld several layers manually with stainless steel welding rod, and at last impose a heat treatment to the pipe. The invention uses refractory stainless steel welding rod A242 taking the place of R317 as the bonding material of the weld. And the steel welding rod improves the mechanical performances and toughness. The weld will not have cracks and will not penetrated in the conditions of high temperature, high pressure and high alkali, and greatly extends the service life of the welding line.

Description

technical field [0001] The invention relates to a welding method for steel pipes, in particular to a welding method for 12Cr1MoV alloy steel pipes. Background technique [0002] 12Cr1MoV alloy steel pipe is a material commonly used in the alumina industry, and its welded connections are usually welded by fusion welding using alloy steel welding materials. The conventional practice is to use H08CrMoVA welding wire as the base and R317 electrode to cover the surface. The weld using this welding process is prone to local cracks and penetration of the weld in a short period of time when the pipeline is under high temperature, high pressure and strong alkali conditions. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to effectively overcome the problem that 12Cr1MoV alloy steel pipe is welded by conventional welding process, which leads to the problem that the weld is prone to cracks and penetration under high temperature, high pressure and strong alk...

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Application Information

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IPC IPC(8): B23K9/028B23K9/23B23K9/235B23K33/00B23K37/053
Inventor 张友学吕新华张灿任静勇郑重
Owner CHINA SIXTH METALLURGICAL CONSTR
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