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The causes of failures in resistance spot welding of car body sheets

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Kascak L. , Vinas J. , Misicko R. , Takacova I. , Vojtko M. , Schmogner M. , Matta M. , Gatial M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

tom z. 80 [274]

135-142

The paper deals with analyzing of defects of resistance spot welds, which mostly occur in welding of materials used in car body production. The defects were evaluated with destructive and non-destructive tests. A non-destructive method was a visual control of weld surfaces of lapped joints. Metallographical analysis of weld joints on scratch patterns was used as a destructive method. The influence of welding parameters on dimensions of weld nuggets was observed with light microscopy. The defects in weld and heat affected zone were documented too. The influence of surface treatment of car body sheets on occurring of defects was evaluated with chemical EDX analysis. EDX analysis was also used for evaluation of weld joints surfaces and for evaluation of influence of weld tips marks on surface quality.