Impulse pin and method for eliminating stress on weld joint through ultrasonic impact treatment of impulse pin

Abstract

The invention discloses an impulse pin and a method for eliminating stress on a weld joint through ultrasonic impact treatment of the impulse pin. The impulse pin comprises a pin head, a transition section and a pin tail which are coaxially and sequentially connected end to end. The front end of the pin head is spherical. The diameter of the transition section is larger than the diameter of the pin head. The diameter of the pin tail is larger than the diameter of the transition section. The length of the impulse pin is 44+/-0.5 mm. The length of the pin head is 30+/-0.5 mm. Impact treatment isperformed on the weld joint through the impulse pin, the front end of the pin head makes contact with the weld joint all the time, and the impulse pin is perpendicular to the plane where the weld joint is located; in the treatment process of a weld toe part, the impulse pin continuously swings back and forth by +/-5 degrees in the direction perpendicular to the weld joint and moves along the weldjoint; and after the impulse pin moves at least twice along the weld joint, impact treatment is completed. The impulse pin can perform impact treatment in the direction perpendicular to the surface of the weld joint and cannot easily touch a machined thread on a detector base, the damage to the thread in the vibration impact process is avoided, and the effect of eliminating the welding stress isimproved.

Description

technical field [0001] The invention belongs to the field of ultrasonic impact, and relates to an impact needle and a method for eliminating weld seam stress by using the same for ultrasonic impact. Background technique [0002] In the process of troubleshooting and overhauling the welding assembly of the aero-engine fan case, the borescope seat needs to be replaced, and the borescope seat needs to be re-welded by the argon arc welding process. Since the components are in the final use state at this time, in order to control the deformation of the parts , After the welding is completed, the overall furnace heat treatment cannot be carried out to eliminate the stress of the argon arc welding seam. Hawker can eliminate welding stress technology is to use high-power and high-frequency ultrasonic energy to impact the metal surface to eliminate welding stress. It has great advantages for parts that do not have overall heat treatment conditions, and can be applied to overhaul comp...

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of the structure of the detector seat parts of the fan case welding assembly, the length of the impact needle of the conventional Hacker energy equipment is relatively short. The screw thread causes bump damage, and at the same time, due to the interference of the probe seat structure, the vibrating needle cannot be perpendicular to the weld for stress relief, and the vibrating needle in the heat-affected zone of the local weld cannot be touched, resulting in the inability to continuously remove the stress of the weld, and the effect of stress relief not ideal

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