Research on signal characteristics of online ultrasonic testing of stainless steel resistance spot welding

WANG Chunsheng; WANG Hongxiao; LI Yingming; DI Xing; XU Guocheng; GU Xiaopeng; DONG Juan

doi:10.7512/j.issn.1001-2303.2021.09.13

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Research on signal characteristics of online ultrasonic testing of stainless steel resistance spot welding
Vol. 51, Issue 9, Pages: 68-74(2021)
DOI： 10.7512/j.issn.1001-2303.2021.09.13

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WANG Chunsheng, WANG Hongxiao, LI Yingming, et al. Research on signal characteristics of online ultrasonic testing of stainless steel resistance spot welding. [J]. 51(9):68-74(2021)
DOI：

WANG Chunsheng, WANG Hongxiao, LI Yingming, et al. Research on signal characteristics of online ultrasonic testing of stainless steel resistance spot welding. [J]. 51(9):68-74(2021) DOI： 10.7512/j.issn.1001-2303.2021.09.13.

摘要

基于Comsol Multiphysics有限元数值仿真软件建立双脉冲电阻点焊过程超声监测数值模型,研究点焊过程工件内部超声场瞬态分布情况;设计了新型内置超声波探头电极结构,进行双脉冲电阻点焊超声在线监测试验,分别分析A型、M型(超声时程-焊接过程)超声回波图特征;研究点焊典型焊接缺陷虚焊的超声M型回波图特征,提出基于M型回波图的虚焊焊点鉴别方法。研究结果表明基于超声信号的点焊M显示图可反映焊接进程,可通过M显示图特征对虚焊焊点进行快速识别。

Abstract

Based on COMSOL Multiphysics finite element simulation software, a numerical model for ultrasonic monitoring of double pulse resistance spot welding（RSW） is established,and the transient distribution of the ultrasonic field inside the workpiece during the spot welding process is studied. The built-in ultrasonic probe electrode is designed, and the ultrasonic online monitoring experiment during the RSW is carried out. The A-type and M-type ultrasonic echo diagrams characteristics are analyzed, the M-type echo diagram characteristic of typical RSW defects is studied, and a new method for identifying the fake welding based on the M-type echo diagram is proposed. The research results show that the RSW M-type diagram based on ultrasonic signal can reflect the welding process, and the fake welding spot can be quickly identified through the M-type diagram characteristic.