Resistance welding. Destructive testing of welds. Specimen dimensions and procedure for cross tension testing of resistance spot and embossed projection welds

2016 ◽  
Keyword(s):  
Resistance Welding ◽  
Destructive Testing ◽  
Resistance Spot ◽  
Tension Testing ◽  
Cross Tension

Influence of Paint Baking on the Energy Absorption and Failure Mode of Resistance Spot Welds in TRIP1180 Steel

2021 ◽  
Vol 143 (9) ◽  
Author(s):  
D. V. Marshall ◽  
D. Bhattacharya ◽  
J. G. Speer
Keyword(s):  
Energy Absorption ◽  
Failure Mode ◽  
Low Energy ◽  
Interfacial Failure ◽  
Spot Welds ◽  
Resistance Spot ◽  
Pull Out ◽  
Resistance Spot Welds ◽  
Tension Testing ◽  
Cross Tension

Abstract Resistance spot welds (RSWs) in advanced high strength steels frequently exhibit interfacial failure during cross-tension testing: a mode of fracture associated with low-energy absorption. Automotive assembly lines include a paint application and baking cycle after the vehicle assembly and joining processes to cure paint and any adhesives used for assembly. In this article, the effects of a typical baking cycle: 180 °C for 20 min, on the failure mode and energy absorption during cross-tension testing of RSWs made in a TRIP1180 steel are reported. Further, short-time baking cycles of 30 s, 90 s, and 4 min were employed to investigate how quickly these baking effects are activated. RSWs, which exhibited interfacial failure and a low-energy absorption of 30.9 J in the as-welded condition, saw a change in a failure mode to partial interfacial failure and a 260% increase in energy absorption after baking for 30 s. After baking for a longer time (4 min), welds failed by button pull-out and exhibited a 296% increase in energy absorption during cross-tension testing. Baking for the full 20 min resulted in no additional improvement than was observed in the 4 min condition. The mechanisms responsible for the majority of the improvement in weld performance during baking are found to be activated after only 30 s of baking.

Fracture mechanisms of Al/steel resistance spot welds in coach peel and cross tension testing

2018 ◽  
Vol 252 ◽  
pp. 348-361 ◽  
Author(s):  
Nannan Chen ◽  
Hui-Ping Wang ◽  
Blair E Carlson ◽  
David R. Sigler ◽  
Min Wang
Keyword(s):  
Fracture Mechanisms ◽  
Spot Welds ◽  
Resistance Spot ◽  
Resistance Spot Welds ◽  
Tension Testing ◽  
Cross Tension
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