Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 22, Issue 2, Pages 97-103Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2016.1199127
Keywords
Welding; Grain refining; AZ91 Mg alloy; Arc oscillation; Dendrite fragmentation
Funding
- National Science Foundation of the United States [DMR 1500367]
- China Scholarship Council
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Grain refining can improve the solidification-cracking resistance and mechanical properties of welds. Mg alloys are increasingly used for vehicle weight reduction, AZ91 Mg being the most widely used Mg casting alloy. The present study was conducted to study grain refining in gastungsten arc welding of AZ91 Mg, focusing on identifying the mechanism of grain refining. Significant grain refining was obtained by transverse arc oscillation. Dendrite fragmentation was identified as the grain refining mechanism, instead of heterogeneous nucleation or grain detachment. This was done by using an overlap welding procedure in which the weld made with transverse arc oscillation (test weld) overlapped with another weld made previously without arc oscillation (preweld). It was found that repeated prewelding followed by welding with transverse arc oscillation resulted in very fine grains.
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