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Glass cloudburst treatment art for improving anti-stress corrosion performance of welding joint of stainless steel

A technology of shot peening and welded joints, which is applied in the field of glass shot peening to improve the stress corrosion resistance of stainless steel welded joints, and can solve problems such as electrochemical corrosion and unfavorable austenitic stainless steel welded joints to resist stress corrosion

Active Publication Date: 2006-04-12
NANJING UNIV OF TECH
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Problems solved by technology

However, for this surface treatment method, steel shot is mainly used for shot peening at present. Due to the brittle pieces of steel shot remaining on the surface of the test piece in this kind of treatment process, the electrochemical corrosion caused by it will not be conducive to the resistance of austenitic stainless steel welded joints. stress corrosion

Method used

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  • Glass cloudburst treatment art for improving anti-stress corrosion performance of welding joint of stainless steel

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Embodiment Construction

[0021] Refer to attached figure 1 , a glass shot peening process to improve the stress corrosion resistance of austenitic stainless steel welded joints:

[0022] 1. Before the glass shot blasting treatment, use a certain surface cleaning treatment method to remove all dust, scale and cladding from the surface of the workpiece 2 to be treated. When required, magnetic particle testing, dye penetrant testing, ultrasonic or other defect and crack detection processes shall be completed prior to glass shot peening. The quality of the glass shot must meet certain requirements.

[0023] 2. Aim the jet welding torch 1 at the weld to be processed and the heat-affected zone, the width of the heat-affected zone is d 2 is the weld width d 1 2 to 3 times of that, if the width of the weld is 10mm, the width of the heat-affected zone on both sides of the weld is about 20-30mm. Then, the projectile is driven by compressed air, so that it reaches the defined weld treatment area of ​​the hig...

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Abstract

A glass grit blasting technology for increasing the stress corrosion resistance of the welded seam between stainless steels includes such steps as cleaning the surface of the welded seam, blasting the glass grits onto the welded seam by a blasting gun driven by compressed air and with an inclination by 70-100 deg.C, cleaning the surface of welded workpiece, and detecting the residual stress by X-ray diffractometer.

Description

technical field [0001] The invention relates to a glass shot blasting treatment process for improving the stress corrosion resistance performance of stainless steel welded joints, which relates to a surface treatment method for reducing the stress corrosion cracking sensitivity of austenitic stainless steel welded joints. Background technique [0002] In petrochemical, textile, paper, atomic energy, pharmaceutical, space navigation, and marine development sectors that use stainless steel, stress corrosion cracking accidents near welded joints account for about 47% of wet corrosion damage accidents. A large number of research results show that the existence of welding residual tensile stress is one of the main factors leading to stress corrosion cracking of austenitic stainless steel welded joints. Shot peening is an ideal method to eliminate the residual tensile stress of welding. It uses high-speed projectiles to spray the surface of welded joints to cause plastic deformati...

Claims

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Application Information

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IPC IPC(8): B24C1/00
Inventor 凌祥倪红芳彭薇薇朱加贵姜卫忠胡启福
Owner NANJING UNIV OF TECH
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