Automatic ultrasonic impact device for girth weld

Abstract

The invention belongs to the field of metal welding, and particularly relates to an automatic ultrasonic impact device for a circumferential weld, which is used for improving stress distribution of a welded joint of the circumferential weld of a pipeline and a pressure vessel, and improving overall performance of the welded joint. The device comprises an annular guide rail, a traveling mechanism and a stress relieving mechanism, wherein the annular guide rail surrounds and is fixed outside the pipeline or the pressure vessel, and is used for supporting the traveling mechanism, the traveling mechanism is installed on the annular guide rail and can conduct a circular motion around the annular guide rail, and the stress relieving mechanism is fixed at one side of the traveling mechanism, and can respectively relieve the stress of weld toes at two sides of the circumferential weld through ultrasonic impact under the driving of the traveling mechanism. The device can complete the work of relieving the stress of the circumferential weld of the pipeline and the pressure vessel through ultrasonic impact, reduces weld defect, eliminates residual stress at the weld toes, and improves the post-weld treatment efficiency; in addition, the device is simple to assemble and disassemble, can be regulated according to different pipe diameters, and is applicable to stress relieving of the circumferential welds of different pipe diameters.

Description

technical field [0001] The invention belongs to the field of metal welding, and in particular relates to an automatic ultrasonic impact device for girth welds, which is used for improving the stress distribution of welded joints of girth welds of pipelines and pressure vessels, and improving the comprehensive performance of the welded joints. Background technique [0002] Pipelines and pressure vessels will inevitably produce welding residual stress in the welding production process. Studies have shown that welding residual stress is an important factor affecting the performance and safety and reliability of welded structures, and will lead to cracks, brittle fracture, fatigue fracture and stress corrosion cracking of welded structures. In order to improve the weld quality of the pipe and pressure vessel joints and reduce the safety hazards during service, it is necessary to carry out post-weld stress relief treatment. Among various post-weld stress relief processes, ultras...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the welding seam stress relief equipment in China is a hand-held ultrasonic impact gun, which requires manual processing of the weld seam repeatedly, resulting in high labor intensity and low production efficiency.

Since the girth weld structure of pipes and pressure vessels has a certain radian, manual ultrasonic impact treatment is not only inefficient but also difficult

There have been researches on automatic detection devices for girth weld defects in China, but there is no report on automatic stress relief devices for girth welds

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