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Method of Stress Corrosion Resistance of Stainless Steel Welded Joints by Nanosecond Pulse Laser Shock

A nanosecond pulse laser and laser shock technology, which is applied in the direction of furnaces, furnace types, heat treatment equipment, etc., can solve the problems of stress corrosion resistance degradation and other problems, and achieve the effect of easy automation, fast processing speed and automatic realization

Active Publication Date: 2019-03-29
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies in the decline in the stress corrosion resistance of austenitic stainless steel welded joints by laser shock strengthening, the present invention proposes a method for resisting stress corrosion of stainless steel welded joints with nanosecond pulse laser shocks

Method used

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  • Method of Stress Corrosion Resistance of Stainless Steel Welded Joints by Nanosecond Pulse Laser Shock
  • Method of Stress Corrosion Resistance of Stainless Steel Welded Joints by Nanosecond Pulse Laser Shock
  • Method of Stress Corrosion Resistance of Stainless Steel Welded Joints by Nanosecond Pulse Laser Shock

Examples

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Embodiment 1

[0029] This embodiment is a process for resisting stress corrosion of stainless steel welded joints subjected to nanosecond pulse laser shock. The test pieces in this example are 316L stainless steel welded joints.

[0030] The specific steps are:

[0031] Step 1, Paste the absorbing protective layer. Aluminum foil with a thickness of 0.05mm to 0.1mm is used as the absorbing protective layer. Paste the aluminum foil on the surface of the weld seam of the test piece and in the area of ​​7mm on both sides of the weld seam, the thickness of the aluminum platinum is ≤0.1mm.

[0032] In this embodiment, the sticking thickness of the absorbing protective layer is 0.05 mm.

[0033] Step 2, forming a constraint layer. A deionized water layer with a thickness of 1 mm to 2 mm is formed on the surface of the absorbing protective layer as a constrained layer by conventional methods and maintained.

[0034] Step 3, laser shock weld. The weld seam is impacted with a nanosecond pulsed ...

Embodiment 2

[0047] This embodiment is a process for resisting stress corrosion of stainless steel welded joints subjected to nanosecond pulse laser shock. The test pieces in this example are 304 stainless steel welded joints.

[0048] The specific steps are:

[0049] The specific steps are:

[0050] Step 1, Paste the absorbing protective layer. Aluminum foil with a thickness of 0.05mm to 0.1mm is used as the absorbing protective layer. Paste the aluminum foil on the surface of the weld seam of the test piece and in the area of ​​6mm on both sides of the weld seam, the thickness of the aluminum platinum is ≤0.1mm.

[0051] In this embodiment, the sticking thickness of the absorbing protective layer is 0.1 mm.

[0052] Step 2, forming a constraint layer. A deionized water layer with a thickness of 1 mm to 2 mm is formed on the surface of the absorbing protective layer as a constrained layer by conventional methods and maintained.

[0053] Step 3, laser shock weld. The weld seam is im...

Embodiment 3

[0066] This embodiment is a process for resisting stress corrosion of stainless steel welded joints subjected to nanosecond pulse laser shock. The test pieces in this example are 304 stainless steel welded joints.

[0067] The specific steps are:

[0068] The specific steps are:

[0069] Step 1, Paste the absorbing protective layer. Aluminum foil with a thickness of 0.05mm to 0.1mm is used as the absorbing protective layer. Paste the aluminum foil on the surface of the weld seam of the test piece and in the area of ​​7mm on both sides of the weld seam, the thickness of the aluminum platinum is ≤0.1mm.

[0070] In this embodiment, the sticking thickness of the absorbing protective layer is 0.08mm.

[0071] Step 2, forming a constraint layer. A deionized water layer with a thickness of 1 mm to 2 mm is formed on the surface of the absorbing protective layer as a constrained layer by conventional methods and maintained.

[0072] Step 3, laser shock weld. The weld seam is im...

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Abstract

The invention provides a method for realizing stress corrosion resistance of a stainless steel welding connector impacted by nanosecond-pulse laser. According to the method, a welding seam is impacted by adopting laser along an S shape, and an outer region of the welding seam is impacted along a direction parallel to the welding seam, so that pull stress of the welding connector is eliminated. By reasonably selecting power density, phase change does not occur and residual pull stress can be eliminated, so that a condition that the stress corrosion resistance performance of the welding connector is reduced is avoided. According to the method provided by the invention, the surface of a workpiece is impacted through the nanosecond-pulse laser, and no obvious mechanical force is used; a machining speed is rapid and automation is easy to realize; a complicated mold surface can be impacted.

Description

technical field [0001] The invention relates to the technical field of surface processing, in particular to a method for resisting stress corrosion of stainless steel welded joints by nanosecond pulse laser shock. Background technique [0002] Laser shock peening is a new surface strengthening technology developed in recent decades. It uses a high-power pulsed laser to induce a plasma shock wave to act on the metal material, which can not only form a residual compressive stress of hundreds of MPa on the surface of the part, but also improve the hardness of the surface of the part and refine the surface grains, thereby significantly improving the stainless steel weldment. Excellent fatigue resistance, wear resistance and stress corrosion resistance. Japan's Toshiba Corporation has applied laser shock treatment technology to the stress corrosion of nuclear reactor pressure vessel welds. Laser shock treatment has been performed on welds such as nuclear reactor pressure vessels...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C21D9/50
CPCC21D9/50C21D10/005
Inventor 李玉琴康进兴王学德于媛孟长军
Owner AIR FORCE UNIV PLA
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