Study on the Optimization Field Welding Conditions of Low Heat-Input Pluse MIG Welding Process for 5052 Aluminum Alloy Sheets

Kim, Jae-seong; Lee, Young-gi; An, Ju-sun; Lee, Bo-Young

Journal of KWJS 2011;29(1):80-84.
Published online March 4, 2011.

Al 5052 합금의 저입열 Pulse MIG 최적 현장 용접조건 산정에 관한 실험적 연구

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Study on the Optimization Field Welding Conditions of Low Heat-Input Pluse MIG Welding Process for 5052 Aluminum Alloy Sheets

Jae-seong Kim, Young-gi Lee, Ju-sun An, Bo-Young Lee

Abstract

The weight reduction of the transportations has become an important technical subject Al and Al alloys, especially Al 5052 alloys have been being applied as door materials for automobile. One of the most widely known car weight-reduction methods is to use light and corrosion-resistant aluminum alloys. However, because of high electrical and thermal conductivity and a low melting point, it is difficult to obtain good weld quality when working with the aluminum alloys. Also, Pulse MIG welding is the typical aluminum welding process, but it is difficult to apply to the thin plate, because of melt-through and humping-bead. In order to enhance weld quality, welding parameters should be considered in optimizing the welding process. In this experiment, Al 5052 sheets were used as specimens, and these materials were welded by adopting new Cold Metal Transfer (CMT) pulse process. The proper welding conditions such as welding current, welding speed, torch angle 50° and gap 0~1㎜ are determined by tensile test and bead shape. Through this study, range of welding current are confirmed from 100A to 120A. And, the range of welding speed is confirmed from 1.2m/min to 1.5m/min.

Key Words: MIG pulse welding, CMT, Welding current, Welding speed, gap, Welding range