Hot Cracking Susceptibility in Welds of High Strength Al Alloys by Using DCSP-GTAW

Ha, Ryeo-Sum; Jung, Byong-Ho; Park, Hwa-Soon

Journal of KWJS 2004;22(5):65-72.
Published online November 12, 2004.

[연구논문] DCSP-GTAW에 의한 고력 Al 합금의 고온균열감수성에 대한 연구

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Hot Cracking Susceptibility in Welds of High Strength Al Alloys by Using DCSP-GTAW

Ryeo-Sum Ha, Byong-Ho Jung, Hwa-Soon Park

Abstract

The tendency and degree of hot cracking of high strength 5083, 6N0l and 7N01 Al alloy welds by using DCSP-GTAW through modified Varestraint test and autogenous butt welding were investigated. In hot cracking test, 6N01 alloy showed the highest susceptibility to hot cracking in the weld metal and HAZ. Cracking susceptibilities generally increased with increase of solidification temperature range of the base metal and bead penetration-to-width ratio of the weld metal. The cracks in welds of the alloys vertically formed to solid-liquid interface and propagated along with columnar grain boundaries. The facture facets of cracks showed the typical morphology of solidification crack observed as dendritic structures. Especially, in 6N01 alloy, liquation cracks which were due to elements of Si, Fe and Mg also observed in HAZ near fusion boundary. In butt welding of different Al alloys, the bead crack was mainly occurred in the welds of 6N01, 7N01 and other Al alloys together with 6N01 or 7N01. In the butt welds of 7N01, it was found that the component of Cu had an effect on the higher susceptibility to the hot cracking.