A Comparison of Weld Properties with or without Filler Wire on Laser Welding of Magnesium Alloy for Car Industry

Abstract

Magnesium alloys are becoming important material for light weight car body, due to their low specific density but high specific strength. However they have a poor weldability, caused by high oxidization tendency and low vapour temperature. In this study, the welding performance of magnesium alloy was investigated for automobile application. The material was rolled magnesium alloy sheet contains 3wt%Al, 1wt%Zn and Mg balance. The effects of filler wire addition was investigated on 2kW Nd:YAG laser welding. For the results, the mechanical properties of welded specimen were similar with base metal in laser welding with and without filler wire. The bridging ability was improved with filler wire without weld properties deterioration on laser welding of magnesium alloy.

Effects of the Types of Coating on the Laser Brazing Characteristics of Dissimilar Joints between Mg Alloy and Steel Sheet

“…또한 주조성이 우수하여 엔진헤드 커버, 오일팬 등의 자동차 부품에 널리 적용되고 있으 며, 진동흡수능이 우수하여 고급자동차의 조향장치는 대부분이 마그네슘합금으로 제조되고 있다 2,3) . 최근에 는 박판주조 및 온간압연에 의하여 마그네슘합 판재의 제조비용이 감소 4) 함에 따라 차체 혹은 판넬류를 마그네 슘 합금판재로 제조하려는 연구가 진행되고 있다 [5][6][7] .…”

Method for welding highly crack susceptible magnesium alloy ZK60

“…However, the LBW with filler wire process is associated with the difficulty in precise control of the parameters, including the wire feeding speed, the wire feeding angle and the position, the welding speed and the laser power. [11][12][13][14] Moreover, it is very difficult and expensive to fabricate the filler wires of magnesium alloys with the diameter ,2 mm, which are suitable for the LBW process, due to the instinct hexagonal lattice structure. 15 Therefore, the LBW with filler wire process shows poor feasibility for welding magnesium alloys, and some other filler welding method, such as laser arc hybrid welding methods, have been developed for the mitigation of the disadvantages mentioned above.…”