Laboratory and computational study of the effect of chemical composition of welding metal on solidification cracks in welding of 6061 aluminum alloy

Welding of aluminum alloys can be accompanied by solidification cracking. The chemical composition of weld metal is one of the factors affecting cracking, which cracking can be prevented by determination of appropriate weld metal composition. The aim of this study was to investigate the effect of filler metal type and dilution rate on crack sensitivity in 6061 alloy welding. Welding was performed using TIG process by two types of filler metals including 1100 and 4043 with different dilutions ratios and the severity of their welding cracks was evaluated. The crack intensity was evaluated by the ΔT2 criterion to evaluate the reliability of this model. The obtained results showed that this model could predict the cracking behavior with relatively good accuracy.

Keywords:

Welding of aluminum alloys , TIG welding , Solidification cracking , Dilution