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Welding process method for improving stress corrosion resistance of stainless steel pipe inner wall welding joint

A technology of stainless steel pipe and welding process, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of increasing workload and achieve the effect of improving the ability of resisting stress corrosion cracking

Inactive Publication Date: 2012-07-18
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

Due to the heat shrinkage of the welding process, there is usually a relatively high value of residual tensile stress at the weld root of the inner surface of the steel pipe, making the welded joint more prone to stress corrosion cracking. For large-wall stainless steel pipes, the usual method It is local heat treatment, but this method can only reduce the residual tensile stress, and cannot completely avoid stress corrosion cracking, and adds additional workload

Method used

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  • Welding process method for improving stress corrosion resistance of stainless steel pipe inner wall welding joint
  • Welding process method for improving stress corrosion resistance of stainless steel pipe inner wall welding joint
  • Welding process method for improving stress corrosion resistance of stainless steel pipe inner wall welding joint

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Embodiment Construction

[0015] The specific implementation of the present invention will be described in detail below in conjunction with the specific welding examples and accompanying drawings of the welding process of the 304L stainless steel pipe of the present invention.

[0016] 1. Machine tools and welding materials

[0017] (1) Welding equipment should use inverter welding machines with good characteristics

[0018] (2) The surface of the welding wire should be free of oil, dirt and other dirt before use.

[0019] 2. Preparation before welding

[0020] (1) Groove preparation

[0021] ① Groove shape and size see figure 2 , where H is 16mm, h is 1mm, L is 3mm, and α is 15°.

[0022] ② Groove preparation is done by machining.

[0023] ③ Clean up the rust, oil, dirt and other dirt within 10-15mm on both sides of the groove and the inner and outer walls to reveal the metallic luster.

[0024] (2) counterpart assembly

[0025] ①The value of the welding gap is less than 1mm, and the gap betwe...

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Abstract

The invention discloses a welding process method for improving stress corrosion resistance of a stainless steel pipe inner wall welding joint. When a stainless steel pipe is welded, a front half section is provided with a common stainless steel wire while a rear half section is provided with a low transformation temperature solid wire to replace an original stainless steel wire, and compressive stress is generated at the weld root of the inner wall of the stainless steel pipe under the action of low-temperature phase transformation expansion. By the aid of the technical scheme, an inner wall seam of the steel pipe contacting with corrosion media has alloy components the same as that of a conventional welding method, and the compressive stress can be generated at the weld root of the inner wall of the steel pipe, so that the stress corrosion cracking resistance of the welding joint is improved.

Description

technical field [0001] The invention belongs to welding process technology, and more specifically relates to a welding process method capable of improving the stress corrosion resistance performance of welded joints. Background technique [0002] 304L is a versatile stainless steel, which is widely used in the production of equipment and parts that require good overall performance (corrosion resistance and formability), such as fluid pipes, boiler superheaters, heat exchangers, condensers, catalytic tubes, etc. . In many industrial applications, stainless steel can provide satisfactory corrosion resistance. According to the experience of use, in addition to mechanical failure, the corrosion of stainless steel is mainly manifested in localized corrosion (that is, stress corrosion cracking, pitting corrosion, intergranular corrosion, corrosion fatigue and crevice corrosion). The failure cases caused by these localized corrosion accounted for almost more than half of the fail...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K35/30
Inventor 徐连勇赵森荆洪阳韩永典
Owner TIANJIN UNIV
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