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Metals 2016, 6(8), 184; doi:10.3390/met6080184

The Effects of Laser Welding Direction on Joint Quality for Non-Uniform Part-to-Part Gaps

1
Smart Factory Laboratory, Ulsan National Institute of Science and Technology, UNIST-gil 50, Ulsan 44919, Korea
2
Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Casalino
Received: 25 May 2016 / Revised: 2 August 2016 / Accepted: 3 August 2016 / Published: 6 August 2016
View Full-Text   |   Download PDF [22008 KB, uploaded 6 August 2016]   |  

Abstract

Controlling part-to-part gaps is a crucial task in the laser welding of galvanized steel sheets for ensuring the quality of the assembly joint. However, part-to-part gaps are frequently non-uniform. Hence, elevations and depressions from the perspective of the heading direction of the laser beam always exist throughout the gap, creating ascending, descending, and flat travelling paths for laser welding. In this study, assuming non-uniform part-to-part gaps, the effects of welding direction on the quality of the joint of galvanized steel sheets—SGARC440 (lower part) and SGAFC590DP (upper part)—were examined using 2-kW fiber and 6.6-kW disk laser welding systems. The experimental analysis of coupon tests confirmed that there is no statistically significant correlation between the direction of welding and weld pool quality if the gap exceeds the tolerable range. However, when the gap is controlled within the tolerable range, the welding direction can be considered as an important process control variable to enhance the quality of the joint. View Full-Text
Keywords: laser welding; part-to-part gap; welding direction; process control laser welding; part-to-part gap; welding direction; process control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Oh, R.; Kim, D.Y.; Ceglarek, D. The Effects of Laser Welding Direction on Joint Quality for Non-Uniform Part-to-Part Gaps. Metals 2016, 6, 184.

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