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Materials 2017, 10(1), 22; doi:10.3390/ma10010022

Investigation on the Mechanism and Failure Mode of Laser Transmission Spot Welding Using PMMA Material for the Automotive Industry

School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
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Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Received: 22 November 2016 / Revised: 16 December 2016 / Accepted: 26 December 2016 / Published: 1 January 2017
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Abstract

To satisfy the need of polymer connection in lightweight automobiles, a study on laser transmission spot welding using polymethyl methacrylate (PMMA) is conducted by using an Nd:YAG pulse laser. The influence of three variables, namely peak voltages, defocusing distances and the welding type (type I (pulse frequency and the duration is 25 Hz, 0.6 s) and type II (pulse frequency and the duration is 5 Hz, 3 s)) to the welding quality was investigated. The result showed that, in the case of the same peak voltages and defocusing distances, the number of bubbles for type I was obviously more than type II. The failure mode of type I was the base plate fracture along the solder joint, and the connection strength of type I was greater than type II. The weld pool diameter:depth ratio for type I was significantly greater than type II. It could be seen that there was a certain relationship between the weld pool diameter:depth ratio and the welding strength. By the finite element simulation, the weld pool for type I was more slender than type II, which was approximately the same as the experimental results. View Full-Text
Keywords: laser technique; laser transmission spot welding; welding mechanism; thermoplastic polymer; morphology of weld pool laser technique; laser transmission spot welding; welding mechanism; thermoplastic polymer; morphology of weld pool
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MDPI and ACS Style

Wang, X.; Liu, B.; Liu, W.; Zhong, X.; Jiang, Y.; Liu, H. Investigation on the Mechanism and Failure Mode of Laser Transmission Spot Welding Using PMMA Material for the Automotive Industry. Materials 2017, 10, 22.

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