Influencing mechanism of inherent aluminum oxide film on coach peel performance of baked Al-Steel RSW

Shanqing Hu; Amberlee S. Haselhuhn; Yunwu Ma; Yongbing Li; Blair E. Carlson; Zhongqin Lin

Materials & Design (Jan 2021)

Influencing mechanism of inherent aluminum oxide film on coach peel performance of baked Al-Steel RSW

Shanqing Hu,
Amberlee S. Haselhuhn,
Yunwu Ma,
Yongbing Li,
Blair E. Carlson,
Zhongqin Lin

Affiliations

Shanqing Hu: Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
Amberlee S. Haselhuhn: Manufacturing Systems Research Lab, General Motors Global R&D, 30470 Harley Earl Blvd, Warren, MI 48092, USA
Yunwu Ma: Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China
Yongbing Li: Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; Corresponding author at: Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
Blair E. Carlson: Manufacturing Systems Research Lab, General Motors Global R&D, 30470 Harley Earl Blvd, Warren, MI 48092, USA
Zhongqin Lin: Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China

Journal volume & issue: Vol. 197
p. 109250

Abstract

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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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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