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Progress in NDT of resistance spot welding of aluminium using ultrasonic C-scan

机译：超声波C扫描技术在铝电阻点焊无损检测中的研究进展

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An ultrasonic C-scan technique was evaluated for non-destructive testing (NDT) of resistance spot welding of aluminium. It was established through fundamental trials that removal of surface indentation from the welding electrode is necessary in order to obtain credible non-destructive assessments of aluminium spot weld size and shape. The non-destructive test results showed good correlation with peeled samples and metallographic cross sections. The technique also provided further fundamental understanding of aluminium resistance spot welding (RSW) process; especially with respect to the presence of an outer fused ring. The fundamental aspect of this study was underpinned using the NDT technique for a real assembly; challenging the technique with access issues, different material combinations, multiple joint stacks and independent measurements. The non-destructive test analyses obtained correlated well with actual tear down results and offered further encouragement that the C-scan technique is viable as a production tool if a suitably flattened surface can be provided.
机译：评估了超声C扫描技术对铝电阻点焊的无损检测（NDT）。通过基础试验确定，为了获得可靠的铝点焊尺寸和形状的无损评估，必须去除焊接电极的表面压痕。无损检测结果与剥落的样品和金相截面具有良好的相关性。该技术还提供了对铝电阻点焊（RSW）工艺的进一步基本了解；特别是关于外部稠环的存在。本研究的基本方面是使用NDT技术进行实际组装的基础。通过访问问题，不同的材料组合，多个接头堆叠和独立的测量来挑战该技术。获得的非破坏性测试分析与实际的拆解结果密切相关，并进一步鼓励了C扫描技术可作为一种生产工具，只要可以提供适当平坦的表面。

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