Surface compound treatment process of austenitic stainless steel welded joint

A technology of austenitic stainless steel and welded joints, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as uneven weld toe transition, large stress concentration, welded joint surface quality, simple process, etc., to achieve Effects of reduced surface roughness, improved stress corrosion resistance, and stress concentration relief

Active Publication Date: 2018-10-26
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the traditional ultrasonic impact treatment process can improve the stress corrosion resistance of austenitic stainless steel welded joints to a certain extent, due to the single processing parameters and simple process, the surface roughness after treatment is large and the transition of weld toe is not smooth. And the problem of uneven surface stress distribution, large stress concentration, and the surface quality of welded joints after treatment need to be further improved

Method used

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  • Surface compound treatment process of austenitic stainless steel welded joint
  • Surface compound treatment process of austenitic stainless steel welded joint
  • Surface compound treatment process of austenitic stainless steel welded joint

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A surface composite treatment process for austenitic stainless steel welded joints, comprising the following steps:

[0030] a. After the surface of the welded joint of the austenitic stainless steel part is cleaned, the heat-affected zone and the weld seam area of ​​the joint are subjected to ultrasonic impact treatment under the first high-power working condition by using the impact gun first, and the needle-shaped impact head is used. The impact power of a high-power working condition is 0.8kW, the impact gun and the treatment surface form a first included angle, the angle of the first included angle is 60°, and the moving speed of the needle-shaped impact head is between 3cm / s;

[0031] b. Then use an impact gun to use a cylindrical impact needle roller to perform ultrasonic impact treatment on the weld area and the weld toe area under the second high power condition. The second high power condition refers to a power of 1 kW to process the weld In the area, the axis...

Embodiment 2

[0036] A surface composite treatment process for austenitic stainless steel welded joints, comprising the following steps:

[0037] a. After the surface of the welded joint of the austenitic stainless steel part is cleaned, the heat-affected zone and the weld seam area of ​​the joint are subjected to ultrasonic impact treatment under the first high-power working condition by using the impact gun first, and the needle-shaped impact head is used. The impact power of a high-power working condition is 1kW, the impact gun and the treatment surface form a first included angle, the angle of the first included angle is 90°, and the moving speed of the needle-shaped impact head is 5cm / s;

[0038] b. Then use an impact gun to use a cylindrical impact needle roller to perform ultrasonic impact treatment on the weld seam area and the weld toe area under the second high power working condition. The power of the second high power working condition is 1.2 kW to treat the weld seam In the are...

Embodiment 3

[0043] A surface composite treatment process for austenitic stainless steel welded joints, comprising the following steps:

[0044]a. After the surface of the welded joint of the austenitic stainless steel part is cleaned, the heat-affected zone and the weld seam area of ​​the joint are subjected to ultrasonic impact treatment under the first high-power working condition by using the impact gun first, and the needle-shaped impact head is used. The impact power of a high-power working condition is 0.9kW, the impact gun and the treatment surface form a first included angle, the angle of the first included angle is 90°, and the moving speed of the needle-shaped impact head is 5cm / s;

[0045] b. Then use the impact gun to use the cylindrical impact needle roller to perform ultrasonic impact treatment on the weld seam area and the weld toe area under the second high power working condition. In the area, the axis of the cylindrical impact needle is perpendicular to the weld area, th...

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Abstract

The invention discloses a surface compound treatment process of an austenitic stainless steel welded joint. The surface composite treatment process comprises the following steps that a, firstly, an impact gun is used for carrying out ultrasonic impact treatment on the heat affected zone and the welding seam zone of the joint by adopting a needle type impact head; b, next, the impact gun is used for carrying out ultrasonic impact treatment on the welding seam zone and the welding toe zone by adopting a cylindrical impact rolling pin; c, then, the impact gun is used for carrying out impact treatment on the heat affected zone, the welding seam zone and the welding toe zone again under the low-power condition by adopting the needle type impact head; d, when the roughness is larger than 128 microns or the hardness is smaller than the hardness of a base material by 1.5 times, the step c is repeated; and e, the treated welding seam zone, the treated welding zone and the treated heat affectedzone are coated by adopting a strong acid with a certain concentration. According to the surface compound treatment process of the austenitic stainless steel welded joint, the mode is adopted, so thatthe stress corrosion resistance of the austenitic stainless steel welded joint is improved, and especially the anti-fluorine ion stress corrosion resistance of the austenitic stainless steel welded joint is improved.

Description

technical field [0001] The invention relates to the technical field of post-welding treatment, in particular to a composite surface treatment process for austenitic stainless steel welded joints. Background technique [0002] As a special surface treatment method, Ultrasonic Impact Treatment (Ultrasonic Impact Treatment) can effectively improve the surface quality of welded joints, eliminate welding residual tensile stress, smooth weld toes, refine surface grain size, and weld joints after treatment Form a certain tensile stress layer and hardened layer, thereby improving the stress corrosion resistance of welded joints, especially austenitic stainless steel welded joints. [0003] Although the traditional ultrasonic impact treatment process can improve the stress corrosion resistance of austenitic stainless steel welded joints to a certain extent, due to the single processing parameters and simple process, the surface roughness after treatment is large and the transition of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D10/00C23C22/50C23G1/08
CPCC21D9/50C21D10/00C23C22/50C23G1/08C23G1/085
Inventor 谭伟范雪鹏周新夏强
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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