Hot Cracking T-Joint Weldability Test of Precipitation Hardenable Al Alloys

Abstract

This article presents research of weldability of aluminium alloys. The research was done at Faculty of Mechanical Engineering, CTU in Prague. In the rolling stock production often used precipitation hardenable Al alloy AlMg1Si1Mn was subjected to the hot cracking weldability test to research its susceptibility to hot cracking during GMAW. Base material and 3 recommended filler wires are subjected to T-joint weld cracking test. As filler wires AlSi5, AlMg4.5MnZr and AlMg5Cr were selected and welding method is GMAW. Tjoint weld cracking test is usable test standardized for evaluation of hot cracking, but as the result of this research it was found, that its sensitivity is very low and other weldability test has to be used to asses weldability properly.