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Semi-automatic argon-arc welding method for bimetal composite pipes

A bimetallic composite pipe, argon arc welding technology, applied in welding equipment, metal processing, arc welding equipment and other directions, can solve the problems of welding stress concentration in the sealing welding part, high labor intensity of workers, large welding heat input, etc. Prevent welding stress concentration, reduce labor intensity of workers, and reduce the effect of welding joints

Active Publication Date: 2014-02-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manual arc welding welding technology is relatively mature, and the cost is low, but its welding speed is slow, the labor intensity of workers is high, and the welding heat input is large, which has a certain negative impact on the corrosion resistance of the stainless steel layer. At the same time, it may Cause welding stress concentration at the sealing welding part

Method used

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  • Semi-automatic argon-arc welding method for bimetal composite pipes
  • Semi-automatic argon-arc welding method for bimetal composite pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first step: groove processing. see figure 1 , the material of the steel pipe is SFG-L415QB-BS316L steel, the diameter of the pipe is ￠355.6×(11+2) mm, the wall thickness δ of the steel pipe to be welded is 11+2 mm, the groove type is V-shaped groove, and the slope is mechanically processed. The end surface of the mouth is processed flat, uniform and smooth. Relevant parameters of the groove after processing: the groove angle α is 55°-65°, the weld gap b between the composite layers of the steel pipe is 2.5-3.5mm, and the blunt edge p of the composite layer is 0.8-1.5mm.

[0042] The second step: nozzle cleaning. Remove the rust, slag, grease, paint and other harmful substances that affect the welding quality on the surface of the welded pipe nozzle, and use mechanical methods to polish the inner and outer surfaces of the nozzle within 50mm on both sides of the groove to a metallic luster.

[0043] The third step: nozzle pairing. Use inner counterparts to align t...

Embodiment 2

[0057] The first step: groove processing. see figure 1 , the material of the steel pipe is SFG-L415QB-BS316L steel, the pipe diameter is ￠508×(16+2) mm, the wall thickness δ of the steel pipe to be welded is 16+2 mm, the groove type is V-shaped groove, and the slope is machined by mechanical processing. The end surface of the mouth is processed flat, uniform and smooth. Relevant parameters of the processed groove: the groove angle α is 55°-60°, the weld gap b between the steel pipe composite layers is 2.5-3.5mm, and the blunt edge p of the composite layer is 0.8-1.5mm.

[0058] The second step: nozzle cleaning. Remove the rust, slag, grease, paint and other harmful substances that affect the welding quality on the surface of the welded pipe nozzle, and use mechanical methods to polish the inner and outer surfaces of the nozzle within 50mm on both sides of the groove to a metallic luster.

[0059] The third step: nozzle pairing. Use inner counterparts to align the pipe nozz...

Embodiment 3

[0073] The first step: groove processing. see figure 1 , the material of the steel pipe is SFG-L415QB-BS316L steel, the pipe diameter is ￠323.9×(10+2) mm, the wall thickness δ of the steel pipe to be welded is 10+2 mm, the groove type is V-shaped groove, and the slope is mechanically processed. The end surface of the mouth is processed flat, uniform and smooth. Relevant parameters of the processed groove: the groove angle α is 60°, the weld gap b between the composite layers of the steel pipe is 3.0-3.5mm, and the blunt edge p of the composite layer is 0.8-1.5mm.

[0074] The second step: nozzle cleaning. Remove the rust, slag, grease, paint and other harmful substances that affect the welding quality on the surface of the welded pipe nozzle, and use mechanical methods to polish the inner and outer surfaces of the nozzle within 50mm on both sides of the groove to a metallic luster.

[0075] The third step: nozzle pairing. Use inner counterparts to align the pipe nozzles. ...

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Abstract

The invention discloses a semi-automatic argon-arc welding method for bimetal composite pipes. The semi-automatic argon-arc welding method includes preprocessing orifices of welded pipelines; sequentially welding root welding layers, transition layers, filling layers and capping layers. The semi-automatic argon-arc welding method for the bimetal composite pipes has the advantages that difficult problems of low welding speeds, high labor intensity of workers and welding heat input quantities, influence on corrosion resistance of stainless steel layers and the like due to the fact that bimetal composite pipes are only welded and constructed manually can be solved, the problem of welding stress concentration at seal welding positions due to high welding head input for conventional cosmetic welding can be solved, the welding quality can be improved, and the welding speed can be increased.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a semi-automatic argon arc welding method for bimetal composite pipes. Background technique [0002] At present, in domestic stations, gathering and transportation pipelines and long-distance pipelines, the welding process of bimetallic composite pipes generally adopts argon arc welding root welding, manual arc welding for filling welding and cover welding. The filling and covering welding of domestic stainless steel bimetallic composite pipes mainly adopts the welding method of manual arc welding. Manual arc welding welding technology is relatively mature, and the cost is low, but its welding speed is slow, the labor intensity of workers is high, and the welding heat input is large, which has a certain negative impact on the corrosion resistance of the stainless steel layer. At the same time, it may Cause welding stress concentration at the sealing welding part. Content...

Claims

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Application Information

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IPC IPC(8): B23K9/16
CPCB23K9/02B23K9/16B23K9/235B23K33/00B23K2101/06B23K2103/16
Inventor 王京张成杰王成杨建强蒲江涛刘爱军叶建波马文贺吴爱军王新张峰王伏新胡瑞海
Owner BC P INC CHINA NAT PETROLEUM CORP
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