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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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  • Abstract
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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 strong alkali due to the welding of 12Cr1MoV alloy steel pipes by conventional welding processes, and to provide a Welding method of 12Cr1MoV alloy steel pipe without cracks and penetration in the lower weld seam

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Embodiment Construction

[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 present invention relates to a steel pipe welding method, in particular to a welding method of 12Cr1MoV alloy steel pipe. Background technique [0002] 12Cr1MoV alloy steel pipe is a material commonly used in the alumina industry. Its welding connections are usually welded by fusion welding using alloy steel welding materials. The conventional method is to use H08CrMoVA welding wire as the base and R317 welding rod as the cover. Welds using this welding process are prone to local cracks and penetration in a short period of time when the pipeline is under high temperature, high pressure and strong alkali conditions. Contents of the invention [0003] The purpose of the present invention is to effectively overcome the problem that 12Cr1MoV alloy steel pipes are easily cracked and penetrated under high temperature, high pressure and strong alkali working conditions due to conventional welding processes, and to provide a method for welding 12Cr1MoV ...

Claims

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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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