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A Method of Eliminating Welding Residual Stress Using High Pressure Water Jet

A high-pressure water jet, residual stress technology, applied in recycling technology, process efficiency improvement, furnace type, etc., can solve the problem of difficult to eliminate residual stress in dead corners, not suitable for high rigid parts such as thick plates, consuming a lot of energy and time. and other problems, to achieve the effect of controlling crack propagation, increasing plastic strain and reducing residual stress

Active Publication Date: 2015-10-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have their own disadvantages. For example, post-weld heat treatment has a good effect on stress relief but consumes a lot of energy and time. For austenitic stainless steel, expensive solution treatment is required. At present, many containers are used directly without heat treatment; vibration Although the aging method has low energy consumption and short cycle time, it is not suitable for processing high-rigidity parts such as thick plates; although the mechanical action method is widely used, it is difficult to eliminate the residual stress in dead angle parts (such as the root of the connection) by these methods, so that the fracture failure is often Generated in dead corner position
There is no design involving high-pressure water jets that can eliminate welding residual stress in the prior art

Method used

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  • A Method of Eliminating Welding Residual Stress Using High Pressure Water Jet
  • A Method of Eliminating Welding Residual Stress Using High Pressure Water Jet
  • A Method of Eliminating Welding Residual Stress Using High Pressure Water Jet

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Effect test

Embodiment 1

[0034] Refer to attached Figure 1~3 , the workpiece 2 is made of 304 stainless steel, the weld 4 on the workpiece 2 is welded with a 304 stainless steel repair welding joint, and the repair welding is performed in the middle of the workpiece 2. The depth of the weld 4 is 4mm, the groove angle of the weld 4 is 60°, and the nozzle 1 diameter is 1mm.

[0035] This embodiment includes the following steps:

[0036] 1) Fix the welded workpiece 2 on the working platform after cooling;

[0037] 2) Move the nozzle 1 directly above the weld 4, the distance between the outlet of the nozzle 1 and the weld 4 is 8 mm, and the water jet 3 ejected from the nozzle 1 is perpendicular to the surface of the workpiece;

[0038] 3) Start the hydraulic and pneumatic systems of the high-pressure water jet delivery pump 7, and adjust the dynamic pressure of the water jet beam 3 axis to 220MPa, which is 0.85~0.9 times the yield strength of the workpiece material;

[0039] 4) Starting from the start...

Embodiment 2

[0045] refer to figure 1 with Figure 4~5 , the workpiece 2 is made of 316 stainless steel, the weld 4 on the workpiece 2 is welded with a 316 stainless steel repair welding joint, the depth of the weld 4 is 4mm, the groove angle of the weld 4 is 60°, and the diameter of the nozzle is 1mm.

[0046] This embodiment includes the following steps:

[0047] 1) Fix the welded workpiece 2 on the working platform after cooling;

[0048] 2) Move the nozzle 1 directly above the weld 4, the distance between the outlet of the nozzle 1 and the weld 4 is 10mm, and the water jet 3 ejected from the nozzle 1 is perpendicular to the surface of the workpiece;

[0049] 3) Start the hydraulic and pneumatic systems of the high-pressure water jet delivery pump 7, and adjust the dynamic pressure of the water jet beam 3 axis to 670MPa, which is 1.4 to 1.6 times the yield strength of the workpiece material;

[0050] 4) Starting from the starting point 5 of the weld 4, move the nozzle 1 along the wel...

Embodiment 3

[0056] refer to figure 1 with Figure 5~6 , The workpiece 2 is made of 304 stainless steel as the cladding material, Q345R as the base material, and the thicknesses are 3 and 17mm respectively. The workpiece 2 is made of a stainless steel composite plate repair welding joint, and the repair welding is performed in the middle of the workpiece 2. The depth of the weld 4 is 4mm, the groove angle of the weld 4 is 60°, and the diameter of the nozzle 1 is 1mm.

[0057] This embodiment includes the following steps:

[0058] 1) Fix the welded workpiece 2 on the working platform after cooling;

[0059] 2) Move the nozzle 1 directly above the weld 4, the distance between the outlet of the nozzle 1 and the weld 4 is 5mm, and the water jet 3 ejected from the nozzle 1 is perpendicular to the surface of the workpiece;

[0060] 3) Start the hydraulic and pneumatic systems of the high-pressure water jet delivery pump 7, and adjust the dynamic pressure of the water jet beam 3 axis to 280MPa...

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Abstract

A method for eliminating the welding residual stress by utilizing high-pressure water jet belongs to technical field of welding. The high-pressure water jet (3) sprayed by a nozzle (1) moves on a weld (4), the axial dynamic pressure of the water jet (3) is adjusted to be 220-700MPa; the distance between the water outlet of the nozzle (1) and the weld (4) is kept to be 5-10mm, the water jet (3) moves back and forth for 4 to 8 times along the weld track and perpendicular to the workpiece surface, and the stress eliminating effect is reinforced. The method for eliminating the welding residual stress is easy to operate, and quickly eliminates the residual stress on the welding part after welding. The stress on the weld in a narrow space can be eliminated, such as dead angle part and repair welding part, and can ensure that the whole weld stress eliminating effect is good, stable and average.

Description

technical field [0001] The invention relates to a method for eliminating welding residual stress by using a high-pressure water jet, belonging to the technical field of welding. Background technique [0002] Welding is a processing technology that uses heating or pressure, adding or not adding filler materials to connect components together indetachably or build up a covering layer on the surface of the base material. It is an indispensable processing technology in modern production. , but due to the highly concentrated instantaneous heat input during welding, the temperature field distribution of the entire component is uneven, and residual stress is inevitably generated after welding. The existence of welding residual stress will seriously affect the processing and manufacturing of weldments and the quality of welding structures Use performance. The working stress distribution state of the welded joint has a significant impact on the mechanical properties of the material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06C21D9/50
CPCY02W30/54Y02P10/20
Inventor 蒋文春罗云王炳英巩建鸣王怀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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