WELDABILITY TEST OF PRECIPITATION HARDENABLE ALUMINIUM ALLOY EN AW 6082 T6

Abstract

The article presents results of weldability test of precipitation hardenable aluminium alloys used often for rolling stock production. The research was conducted at Department of Manufacturing Technology, Faculty of Mechanical Engineering, Czech Technical University in Prague. The used material was EN AW 6082 T6. The weldability by GTAW and GMAW welding methods was assessed by Houldcroft`s weldability test (Fishbone test). Using this weldability test susceptibility of the base metal and influence of filler wire selection to solidification cracking was evaluated. As filler wire AlSi5, AlMg4.5MnZr and AlMg5Cr were selected, because they are recommended for selected base metal. During the tests, it was found that to evaluate the susceptibility to solidification cracking GTAW method is much more sensitive than GMAW welding. The results of base metal test had shown that it is very susceptible to solidification cracking. As the filler metal the AlMg5Cr gave the best results, it suppressed solidification cracking the most.

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