The Paton Welding Journal, 2020, №01



2020 №01 (09)

DOI of Article 10.37434/tpwj2020.01.01

2020 №01 (02)

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The Paton Welding Journal, 2020, #1, 2-13 pages
 
Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                      0957-798X (print)
Issue                       #1, 2020 (February)
Pages                      2-13

Processes of nonconsumable electrode welding with welding current modulation (review) part iii. modeling of the processes of TIG welding by modulated current

Boyi Wu¹ and I.V. Krivtsun²

¹Guangdong Institute of Welding (China-Ukraine E.O. Paton Institute of Welding) 363 Chiansin Str., 510650, Guangzhou, Tianhe. E-mail: wuby@gwi.gd.cn
²E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

A review of investigations devoted to the processes of inert-gas nonconsumable electrode welding with welding current modulation was performed. The third part of the review is devoted to analysis of the works, dealing with theoretical study and mathematical modeling of the processes of heat-, mass- and electric transfer in arc plasma and welded metal in TIG welding by modulated current. Different approaches to theoretical study of the above-mentioned processes are described, as well as respective mathematical models, allowing for the conditions of nonconsumable electrode welding with low-frequency (up to 10 Hz) and high-frequency (above 10 kHz) pulse modulation of welding current. Results of numerical analysis of the distributed and integral characteristics of an argon arc with refractory cathode at pulse variation of current are given. It was performed on the base of models of a nonstationary arc with distributed and concentrated parameters. Results of computer modeling of thermal, hydrodynamic and electromagnetic processes in the welded metal (also at self-consistent accounting of the processes that proceed in arc plasma) were analyzed for the case of spot TIG welding with low-frequency pulse modulation of current. Presented are the analytical dependencies that describe the impact of the shape and parameters of welding current pulses on the characteristics of dynamic action of an arc with a refractory cathode on weld pool metal. 21 Ref., 4 Tables, 19 Figures.
Keywords: arc with refractory cathode, TIG welding, arc plasma, metal being welded, penetration, welding current modulation, pulse, frequency, duty cycle, amplitude, mathematical modeling
 
Received:                21.12.19
Published:               21.02.20
 

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