Weld bead residual stress eliminating device and method

Abstract

The invention belongs to the technical field of welding and particularly relates to a weld bead residual stress eliminating device and method. The device comprises a base, an eliminating unit and a fixing unit, wherein the eliminating unit is fixed to the base and comprises a guide rail plate, a first support, a second support and an ultrasonic impact head, the fixing unit comprises a fixing plate, a second air cylinder and a pressing plate, when a part is fixed, the first support is controlled to slide in the cross-shaped sliding groove to adjust the position, a swinging angle of the second bracket is controlled through extension and retraction of a first cylinder, when an ultrasonic impact head is close to the welding bead, the ultrasonic impact head is started, so the residual stress ofthe welding bead is eliminated, the residual stress of the part at the welding bead is reduced, the fatigue strength, brittle failure resistance, stress corrosion cracking resistance and high-temperature creep cracking resistance of a part structure are guaranteed, and the welding machining quality of the part is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a welding bead residual stress eliminating device and method. Background technique [0002] Welding residual stress is a key issue in the field of welding engineering research; in various engineering applications involving welding, great attention is paid to the influence of residual stress; for example, in the field of civil engineering, for steel structure welded connections, residual stress has an , stable bearing capacity, etc. are all affected; the welding residual stress is the initial stress on the section of the component that has not yet been loaded. The redistribution of secondary deformation and residual stress will not only reduce the stiffness and stability of the structure, but also seriously affect the fatigue strength, brittle fracture resistance, stress corrosion cracking resistance and high temperature creep of the structure under the joint action of temperatur...

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the deficiencies of the existing technology, the method of hammering the weld bead to eliminate residual stress cannot completely eliminate the residual stress, which brings certain safety hazards to the long-term operation of the equipment. At present, the ultrasonic impact method is mostly operated by hand-held ultrasonic impact equipment. , the operation intensity is high, and the impact pressure cannot be kept constant, and the impact effect is general; the invention proposes a welding bead residual stress elimination device and method

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