Method for eliminating welding residual stress by utilizing high-pressure water jet

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,...

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

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