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Stainless steel tube welding method

A stainless steel tube and welding method technology, applied in welding equipment, welding/welding/cutting items, tubular items, etc., can solve the problems of small internal pores, fast heat conduction of stainless steel, and many welding seam problems, and achieve good welding seam back, The effect of uniform forming layer and good internal quality

Inactive Publication Date: 2019-04-19
SHANGHAI WAIGAOQIAO SHIP BUILDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stainless steel has fast heat conduction and low melting point, so there are many weld problems in the welding process.
For example, the formation of the base layer is uneven, there are welding bumps, thick-walled pipes are prone to failure to fuse, and internal small air holes caused by insufficient inflation gas protection

Method used

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  • Stainless steel tube welding method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, the specification of the stainless steel pipe is DN125×5, and the groove is processed by the groove processing equipment. The V-shaped groove and the paint, dirt, burrs, etc. in the 20mm area on both sides of the groove are cleaned with a grinder and the metallic luster is exposed. Cleaning the area to be welded is beneficial to improve the stability of welding quality. Group the grooves, such as figure 2 As shown, the groove shape is a V-shaped groove, the groove angle is 60°, the blunt edge is 1mm, the pairing gap is 2mm, and the inner wall of the welded joint is flush after the pairing. Uniform spot welding on the circumference of the V-shaped groove makes the two stainless steel pipes to be welded relatively fixed, so as to prevent the two stainless steel pipes to be welded from being separated in subsequent operations, which affects the welding efficiency and effect. When performing spot welding, spot welding is performed on the circumfer...

Embodiment 2

[0037] The stainless steel pipe with a specification of DN125×5 is welded with a 90° stainless steel elbow of the same specification. The welding method of this embodiment is basically the same as that of Example 1. The difference is that due to the 90° stainless steel elbow, the inner wall thickness is slightly If it is thicker than the wall thickness of the stainless steel pipe, the inner wall will not be flush after the bevel alignment, resulting in misalignment. Therefore, before the groove assembly, use a grinder to grind the inner side of the 90° stainless steel elbow to form a slope transition. The transition length is preferably 8-9 mm to ensure that the inner wall of the stainless steel pipe and stainless steel elbow is flush after assembly. This will avoid the lack of weld fusion caused by asymmetrical wall thickness.

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Abstract

The invention provides a stainless steel tube welding method. The stainless steel tube welding method comprises the following steps that 1, welding ends of stainless steel tubes to be welded receive groove machining; 2, to-be-welded areas receive cleaning; 3, the grooves of the stainless steel tubes with the grooves machined are assembled to form a groove joint, wherein the grooves are V-shaped grooves, an assembly gap between the V-shaped grooves is 2-4 mm, an angle ranges from 60 degrees to 70 degrees, the inner walls are flush after assembling, the alignment tolerance of the inner walls isnot more than 10% delta, and delta is the wall thickness of the stainless steel tubes; 4, the groove joint receives spot welding fixation; and 5, manual full-argon-arc welding on the groove joint is carried out, and gas protection is carried out on a welding surface and a welding back surface in the welding process. According to the stainless steel tube welded by the stainless steel tube welding method, a welding seam is uniform in forming, no weld beading exists, the inner quality of the welding seam is good, the welding seam oxidation is avoided, and the phenomenon that thick-wall stainlesssteel tubes are not fused is avoided.

Description

Technical field [0001] The invention relates to the field of welding, and in particular to a stainless steel pipe welding method. Background technique [0002] Because stainless steel has excellent corrosion resistance, formability, compatibility and strength and toughness in a wide temperature range, it is widely used in heavy industry, light industry, daily necessities industry, building decoration and other industries. Stainless steel conducts heat quickly and has a low melting point, so there are many weld problems during the welding process. For example, the base layer is unevenly formed and has welding burrs. Thick-walled pipes are prone to problems such as lack of fusion and small internal pores caused by insufficient inflatable gas protection. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a stainless steel pipe welding method in order to overcome the above-mentioned defects of the prior art. [0004] ...

Claims

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Application Information

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IPC IPC(8): B23K9/028B23K9/235B23K33/00B23K103/04B23K101/06
CPCB23K9/0282B23K9/235B23K33/004
Inventor 徐景顾超
Owner SHANGHAI WAIGAOQIAO SHIP BUILDING CO LTD