Automatic ultrasonic impact device for straight welding line in pipeline

Abstract

The invention belongs to the field of metal welding and in particular relates to an automatic ultrasonic impact device for a straight welding line in a pipeline, which is used for improving the stress distribution of welding joints and improving the comprehensive performance of the welding joints. The automatic ultrasonic impact device for the straight welding line in the pipeline comprises a traveling mechanism, a stress elimination mechanism and a slag clearing mechanism and is characterized in that the traveling mechanism is a main body of the automatic ultrasonic impact device for the straight welding line in the pipeline and can be used as a bearing structure for crawling in the pipeline; the stress elimination mechanism is arranged on the rear part of the traveling mechanism and can be used for performing ultrasonic stress elimination processing on the straight welding line in the pipeline; the slag clearing mechanism is arranged on the front part of the traveling mechanism and is used for clearing away welding slag of the straight welding line in the pipeline. The automatic ultrasonic impact device for the straight welding line in the pipeline can synchronously implement the welding slag clearing work and the ultrasonic impact stress elimination work for the straight welding line in the pipeline, so that residual stress at a weld toe is eliminated, and the fatigue strength is improved; therefore, the postweld treatment efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of metal welding, and in particular relates to an automatic ultrasonic impact device for straight welds in pipelines, which is used for improving the stress distribution of welded joints and improving the comprehensive performance of welded joints. Background technique [0002] The technology of ultrasonic shock to eliminate weld residual stress has been widely used. Ultrasonic impact technology can cause strong plastic deformation of the weld toe and lead to grain refinement, generate a compressive stress layer, improve surface hardness, and at the same time greatly reduce the surface roughness at the weld toe, and make it a smooth transition, and finally achieve Eliminate weld residual stress, improve fatigue strength, and prevent stress corrosion cracking. [0003] Most of the existing ultrasonic shock stress relief equipment is a hand-held ultrasonic shock gun, which requires repeated manual processing of the wel...

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Problems solved by technology

[0005] In order to solve the problems in the prior art that the welding slag on the inner wall of the pipeline is difficult to remove and the defects and stress at the weld toe of the weld are difficult to eliminate, the present invention provides an automatic ultrasonic impact device for the straight weld in the pipeline, which is used for cleaning the straight weld on the inner wall of the pipeline. Slag and ultrasonic shock stress relief

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