Journal
MATERIALS & DESIGN
Volume 197, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.109250
Keywords
Resistance spot welding; Baking; Oxide film; Dissimilar materials; In-situ high temperature SEM
Categories
Funding
- GM Research and Development Center
- National Natural Science Foundation of China [U1764251, 51322504, U1564204]
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In this study, a traditional resistance spot weld process combined with Multi-Ring Domed welding electrodes was utilized to join AA5754-O to low carbon steel. The baked joints exhibited severe weakening and demonstrated an interfacial fracture mode attributed to thermal stress induced by the baking process.
A traditional resistance spot weld process in combination with Multi-Ring Domed welding electrodes was applied to join AA5754-O to low carbon steel. The coach peel performance of welds was compared between the as-welded (unbaked) and post-paint bake condition (baked). The unbaked joints exhibited button pullout fracture mode, whereas the baked joints were severely weakened and demonstrated an interfacial fracture mode which is attributed to the baking process inducing thermal stress at the dissimilar material interface which cracked the semi-continuous oxide film inclusions at the edge of the solidified aluminum nugget to form a more continuous defect layer across the diameter of the aluminum nugget. These defects act as low energy crack paths under applied loads and reduce joint strength by promoting undesirable interfacial fracture in baked welds. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
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