High-efficiency ultrasonic impact head for soldering joint stress release

Abstract

The invention relates to a high-efficient ultrasonic impact head for removing welding stress. The impact head comprises an impact head body and impact pins movably assembled in impact pinholes of the impact head body; two impact pins are symmetrically distributed on two side of a central axis, take the central axis as criteria and incline inwards to form an oblique angle alpha of between 2 and 5 degrees; each impact pin is of a cylindrical ball head shape; the diameter of each impact pin is between 5 and 8 mm; the length of each impact pin is between 30 and 35 mm; after each impact pin is arranged in the impact pin body, the length of the exposed part is required between 15 and 20 mm; and the lower part of the impact pin body is connected with an impact gun through screw thread. The impact head adopts two symmetric impact pins to simultaneously treat welding toes of two side of a weld joint, can remarkably improve the impact efficiency by 20 to 50 percent compared with a multi-pin impact head, improve the degree of the impact force, the impact strength, the removal of welding stress and the improvement of fatigue strength by more than 5 to 10 percent compared with the multi-pin impact head, has good impact effect, greatly improve the impact efficiency and stability in the treatment of a long aluminum alloy welding joint and has good economic benefit.

Description

technical field [0001] The invention relates to a metal welding seam surface treatment technology, in particular to a high-efficiency ultrasonic impact head for welding seam stress relief. Background technique [0002] Metal welding is a commonly used processing technology in metal processing. After metal materials are welded, due to the stress concentration of the weld toe and the influence of residual tensile stress and other factors, the fatigue performance of the welded seam is much lower than that of the base metal. For some large welded structures such as airplanes and bridges, if fatigue cracks appear in the welded parts, the serious consequences will be unimaginable. For these predictable welding defects, appropriate and effective measures must be taken to eliminate them. How to reduce the damage caused by the reinforcement Stress concentration and elimination of defects on the surface of weld toes, adjustment of welding residual stress field, elimination of its nega...

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Problems solved by technology

[0002] Metal welding is a commonly used processing technology in metal processing. After metal materials are welded, due to the stress concentration of the weld toe and the influence of residual tensile stress and other factors, the fatigue performance of the welded seam is much lower than that of the base metal. For some large welded structures such as airplanes and bridges, if fatigue cracks appear in the welded parts, the serious consequences will be unimaginable. For these predictable welding defects, appropriate and effective measures must be taken to eliminate them. How to reduce the damage caused by the reinforcement Stress concentration and elimination of defects on the surface of weld toes, adjustment of welding residual stress field, elimination of its negative effects, and a change in the direction conducive to improving fatigue performance are people's urgent requirements and long-term problems. It has been proved by practice that ultrasonic Impact treatment is the main measure to greatly improve the welded structure and improve the fatigue resistance of the welded structure. This has become a recognized technology, and the ultrasonic impact head is the key component to realize the ultrasonic impact treatment. Needle or multi-needle impact arrays, although the diameter and shape of the impact needles are different, but because ultrasonic impact can only be processed on one side of the weld, the treatment effect is not ideal, and the treatment efficiency is not high, especially for long welds. lower

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