Effect of Intermetallic Compound Content on the Laser Welding Performance of Al-Fe Alloy Sheets

摘要

The present study investigated the laser welding performance of Al-Fe alloy sheets with different contents of intermetallic compounds (IMCs). Under the same welding parameters, the alloy with higher IMCs content has wide and deep weld pools with uniform sizes. The alloy with lower IMCs content has narrow and shallow weld pools with nonuniform sizes. The higher content of IMCs results in higher laser absorptivity and lower thermal conductivity, and then increases the effective absorbed energy during welding, which is beneficial to the formation of wide and deep weld pools. The distribution uniformity of IMCs influences the size uniformity of weld pools. In the alloy with lower content of IMCs, the nonuniform distribution of IMCs results in the formation of abnormal weld pool, leading to the nonuniform size of the weld pools. In the alloy with higher content of IMCs, uniform distributions of IMCs make the size of weld pools more uniform.