Droplet Transfer Behavior of Flux Cored Wire TIG Welding

Lijun Yang; Tianxi He; Ying Liu; Yonglei Zhai; Huan Li

doi:10.1007/s12209-017-0086-6

Transactions of Tianjin University ›› 2018, Vol. 24 ›› Issue (1) : 82 -90. DOI: 10.1007/s12209-017-0086-6

Research Article

Droplet Transfer Behavior of Flux Cored Wire TIG Welding

Lijun Yang ¹^,²^,^a
, Tianxi He ¹^,²
, Ying Liu ¹^,²
, Yonglei Zhai ¹^,²
, Huan Li ¹^,²

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Abstract

This paper puts forward a new method to achieve flux cored wire TIG welding and uses high-speed photography to analyze the droplet transfer behavior and forces acting on the droplet. The droplet transfer forms include bridging transfer, slag column guided transfer, and non-contact transfer; each of these forms may be observed as the melting position of the welding wire changes. The important role of surface tension in the process of droplet transfer is proposed using static force balance theory and pinch instability theory. The phenomenon of droplet backward swing during welding process could be attributed to the vapor recoil force produced by vapors from the droplet. The welding experiments show that the proposed welding process is stable and that the weld quality produced is good.

Keywords

TIG welding / Flux cored wire / Droplet transfer / Surface tension / Vapor recoil force

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Lijun Yang, Tianxi He, Ying Liu, Yonglei Zhai, Huan Li. Droplet Transfer Behavior of Flux Cored Wire TIG Welding. Transactions of Tianjin University, 2018, 24(1): 82-90 DOI:10.1007/s12209-017-0086-6

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