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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Study on Relationship Between Arc Behavior and Joint Forming in Cold Metal Transfer Welding Technology with Polarity-Exchanging
Lijun Han, Pengyu Lin, Gengwei Zhang, Lihui Zhong, Changhua Liu
FAW-Volkswagen Automotive Co., Ltd., Changchun 130011, China
Abstract:
Cold metal transfer with polarity-exchanging is a new integrated welding technology based on MIG. Due to the alternation of the positive and negative polarities of the wire, favorable control upon the deposition rate and the welding shape coefficient was obtained in order to meet the desired joint design, and the related controlling principles and joint characteristics were reported. Droplet transfer physical behavior exhibited strong dependability on the studied welding parameters, such as welding voltage, welding current, wire feeding speed, and polarity-exchanging. This welding technology provides a new way for the welding of body-in-white (BIW) thin sheet with special demands. Moreover, the typical quality defects of MIG were greatly improved. Our study provides important technical information from the perspective of industrial application of MIG and sheds light on the higher application level of MIG in BIW welding.
Key words:  MIG  cold metal transfer  polarity-exchanging  arc behavior  joint shape coefficient
DOI:10.11916/j.issn.1005-9113.19010
Clc Number:TG444
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