Effect of Filler Wire Feed Rate on the Formation of Porosity in Laser Welded Joints of Magnesium Alloy AZ31B–H24

In this work, the effect of a filler wire feed rate was studied with special attention to proportion porosity volume in weld metal, microstructure, and mechanical properties. Butt laser joints were created using Nd:YAG laser. Weld produced AZ31 diameter 1.2 mm. Decreasing led an increase metal. Therefore, is more likely occur welding without use wire. Clear segregation aluminium, manganese, zinc observed EDS maps local line profile measurements. The precipitates formed rich Al Mn or Zn, compared matrix. They also show large decrease Mg content minimum values ranging from 10 60 wt.% precipitates. To investigate pores metal joint, computed tomography used. highest measured joint no. 3. (0.63 mm3). On contrary, lowest detected 1. (0.06 largest width (2.25 mm) if 130 cm/min. average microhardness (82.5 HV0.1) recorded 3, fracture occurred tensile strength only 154 MPa.