Measurement of nugget size of spot weld by digital shearography

Lianxiang Yang; Praveen R. Samala; Sheng Liu; Kah Wah Long; Yung-Li Lee

doi:10.1117/12.617560

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18 August 2005 Measurement of nugget size of spot weld by digital shearography

Lianxiang Yang, Praveen R. Samala, Sheng Liu, Kah Wah Long, Yung-Li Lee

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Proceedings Volume 5880, Optical Diagnostics; 588008 (2005) https://doi.org/10.1117/12.617560
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

Resistance spot welding is now widely used in the fabrication of sheet metals, mainly due to the cost and time considerations. Friction stir spot welding is getting more and more acceptance in the automotive industries. Such spot welds are found in nearly all products where sheet metal is joined. Obviously the quality of the spot weld has a direct impact on the quality of the product. The most important quality target of spot welds is the size of the weld nuggets. If the weld nuggets are improperly or incompletely formed, or the area surrounding the nugget is smaller than required, the structural integrity of the entire part may be uncertain. Furthermore these inconsistencies are usually internal and are seldom visible to optical inspection. This study is focused on the quality analysis of the spot welds by using "Digital Shearography". The paper mainly focuses on developing a novel, whole field technique for non-destructive inspecting the size of spot-welds, both for the resistance spot weld and the friction stir spot weld.

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Lianxiang Yang, Praveen R. Samala, Sheng Liu, Kah Wah Long, and Yung-Li Lee "Measurement of nugget size of spot weld by digital shearography", Proc. SPIE 5880, Optical Diagnostics, 588008 (18 August 2005); https://doi.org/10.1117/12.617560

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