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Porosity reduction through a Ti particle based gap-paste in arc welding of zinc coated steel

Authors
Kam, Dong-HyuckLee, Tae HyunKim, Jedo
Issue Date
Aug-2018
Publisher
ELSEVIER SCIENCE SA
Keywords
Zinc coated steel; GMA welding; Gap paste; Zinc vapor; Ti particle; Weld quality
Citation
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.258, pp.211 - 219
Journal Title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume
258
Start Page
211
End Page
219
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/3360
DOI
10.1016/j.jmatprotec.2018.03.022
ISSN
0924-0136
Abstract
Gap-paste is used to create gaps, for zinc vapor release, between the zinc coated steel sheets during the arc welding process. In-depth morphology analysis of the gap after the welding is presented which shows zinc oxide formation patterns are consistent with zinc vapor release through the formed gaps. Porosity analysis for four different mask configuration shows that the porosity of the sample, with 120 mu m gaps created by the paste, is reduced from similar to 15% to a near zero value. The tensile shear stress test reveals that the strength of the welded samples increased by similar to 30% compared to that of the samples with no gaps. High-speed camera images are also presented showing the changes in the zinc vapor release mechanism when the paste is applied, and the various stages of zinc vapor release during the welding process are discussed.
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