Effect of Laser Welding Parameters on Porosity of Welds in Cast Magnesium Alloy AM50

Volume 1 - Issue 2

Karl Fahlström¹*, Jon Blackburn², Leif Karlsson³ and Lars-Erik Svensson³

Received: December 03, 2018;   Published: December 14, 2018

DOI: 10.32474/MAMS.2018.01.000106

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Abstract

Pores in the weld metal lower the mechanical properties of the weld. It is therefore important to understand the pore formation mechanisms and find procedures that could reduce porosity. This study focused on laser welding of 3 mm thick magnesium alloy AM50, investigating how different parameters affect porosity formation. Low levels of porosity content were achieved by either increasing the welding speed or using a two-pass welding approach. It was found that higher welding speeds did not allow pores, which were pre-existing from the die-casting process, to have sufficient time to coalesce and expand. In the two-pass welding technique, pores were removed as a result of a degassing process which occurred through the second pass.

Keywords: Laser welding; Magnesium, Cast; Metallurgy; Porosity; Automotive; AM50

Abstract| Introduction| Experimental| Results| Effect of Welding Parameters on Porosity| Discussion| Conclusion| Acknowledgement| References|