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Stainless steel composite pipe welding joint surface strengthening treatment method

A technology for welded joints and surface strengthening, which is applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of low strength of welded joints and difficulty in dealing with harsh environments with corrosion resistance, and achieve low current density, improved performance strength, and corrosion resistance good performance

Active Publication Date: 2022-03-18
天信管业科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings in the prior art that the strength of the welded joint is low due to the lack of surface heat treatment and subsequent grinding and plating, and the corrosion resistance is difficult to cope with harsh environments, and a stainless steel composite pipe welding is proposed. The method of joint surface strengthening treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The first step is to clean the external dust, impurities and oil stains of the welded joints after welding through the emulsion of the machine head, and then put a group of parts into the shot blasting room for shot peening. The diameter d=0.425mm is used for shot peening. The standard steel shot AS110H carries out surface treatment on the welded joints. The shot speed is v=120m / s, and the coverage rate is 200%. Shot peening in the middle;

[0024] The second step is to put the shot-peened welded joint into a heat treatment furnace for stress annealing. The temperature of the welded test piece is not higher than 200°C, and it is kept at a temperature of 590±15°C for 0.3h, and the heating rate is controlled. Not higher than 150°C, the cooling rate is not higher than 120°C / h, and the welding test piece is taken out when the temperature in the furnace is lower than 200°C, and the heat treatment time of the welded joint is controlled at 0.5h during the surface heat treatmen...

Embodiment 2

[0029] The first step is to clean the external dust, impurities and oil stains of the welded joints after welding through the emulsion of the machine head, and then put a group of parts into the shot blasting room for shot peening. The diameter d=0.425mm is used for shot peening. The standard steel shot AS110H carries out surface treatment on the welded joints. The shot speed is v=120m / s, and the coverage rate is 200%. Shot peening in the middle;

[0030] The second step is to put the shot-peened welded joint into a heat treatment furnace for stress annealing. The temperature of the welded test piece is not higher than 200°C, and it is kept at a temperature of 590±15°C for 0.5h, and the heating rate is controlled. Not higher than 150°C, cooling rate not higher than 120°C / h, and take out the welded test piece when the temperature in the furnace is lower than 200°C, and control the heat treatment time of the welded joint within 1.5h during the surface heat treatment process;

...

Embodiment 3

[0035] The first step is to clean the external dust, impurities and oil stains of the welded joints after welding through the emulsion of the machine head, and then put a group of parts into the shot blasting room for shot peening. The diameter d=0.425mm is used for shot peening. The standard steel shot AS110H carries out surface treatment on the welded joints. The shot speed is v=120m / s, and the coverage rate is 200%. Shot peening in the middle;

[0036] The second step is to put the shot-peened welded joint into a heat treatment furnace for stress annealing. The temperature of the welded test piece is not higher than 200°C, and it is kept at a temperature of 590±15°C for 0.3h, and the heating rate is controlled. Not higher than 150°C, cooling rate not higher than 120°C / h, and take out the welded test piece when the temperature in the furnace is lower than 200°C, and control the heat treatment time of the welded joint within 0.5h during the surface heat treatment process;

...

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Abstract

The invention discloses a stainless steel composite pipe welding joint surface strengthening treatment method, and relates to the field of machining, the technical scheme comprises the following steps: 1, external cleaning: cleaning dust, impurities and greasy dirt outside a welded welding joint; a standard steel shot AS110H with the diameter d being equal to 0.425 mm is adopted for conducting surface treatment on the welding joint, the shot spraying speed v is equal to 120 m / s, and the coverage rate is 200%; the welded joint subjected to shot blasting treatment is put into a heat treatment furnace to be subjected to stress annealing treatment, the furnace entering temperature of a welded test piece is not higher than 200 DEG C, the surface of the welded joint subjected to heat treatment is polished, the polishing depth is controlled at the 2 / 5 position of a strengthened layer, and at the moment, the corrosion resistance of the welded joint is improved again; and finally, the polished welding joint is galvanized, so that the performance strength of the welding joint is improved, and the welding joint is suitable for various severe occasions.

Description

technical field [0001] The invention relates to the technical field of surface strengthening of welded joints, in particular to a method for surface strengthening treatment of welded joints of stainless steel composite pipes. Background technique [0002] Welded joints are joints where two or more parts are to be combined by welding. Or refers to the joint where two or more parts are connected by welding, including weld seam, fusion zone and heat-affected zone. Fusion welded joints are formed by localized heating of a high temperature heat source. The welded joint is composed of weld metal, fusion zone, heat-affected zone and base metal. The mechanical properties of the welded joint depend on its chemical composition and organization. Therefore, the factors that affect the chemical composition of the weld and the structure of the welded joint all affect the performance of the welded joint. [0003] After searching, the invention patent with the Chinese patent number CN103...

Claims

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Application Information

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IPC IPC(8): C21D1/30C21D7/06C21D9/50C25D3/22C25D5/36C25D7/04B24B1/00
CPCC21D9/50C21D1/30C21D7/06C25D3/22C25D7/04C25D5/36B24B1/00
Inventor 刘凡闫宇张胜忠刘伟
Owner 天信管业科技集团有限公司