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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Self-adjusting dynamic characteristics of
pulsed MIG welding for aluminum alloys
BAO Ye-feng(包晔峰), ZHOU Yun(周 昀), WU Yi-xiong(吴毅雄), LOU Song-nian(楼松年)

Welding Engineering Institute, Shanghai Jiaotong University, Shanghai 200030, China

Abstract:Pulsed MIG welding is suitable for aluminum alloys welding, because spray transfer and excellent profile can be arrived during whole welding current range, and the energy of droplet can be controlled to overcome losing of alloy elements with lower melting and steam point by controlling pulse current and pulse time. Because of the special physic properties of aluminum alloys, there are different requirements for pulsed MIG welding between starting arc short circuit and drop transfer short circuit, pulse period and base period. In order to satisfy the need of aluminum alloys MIG welding, self-adjusting dynamic characteristics are designed to output different dynamic characteristics in different welding startes. The self-adjusting dynamic characteristics of pulsed MIG welding are achieved through a short circuit controller and a dynamic electronic inductor. The welding machine(AL-MIG 350) with self-adjusting dynamic characteristics has a high rate of successfully starting arc up to 96%, and the short circuit time during transfer is less than 1 ms, in the mean time, the arc is stiffness, spatter is low and weld appearance is good.

 

Key words: aluminum alloys; MIG welding; self-adjusting dynamic characteristics

ISSN 1672-7029
CN 43-1423/U

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