X-ray CT Scan Analysis of Oxidized Welded AA6061 Al Alloy

Abstract

In arc welding, an electrode is used to conduct a current to fuse the two pieces metals together. Inappropriate selection of filler wire can gives effect to the metallurgical and stability of the welded structure. In this research, we use electrode ER 4043 and ER5356 to study the mechanical properties of the AA6061 Al alloy. Different types of filler wire give a different condition on mechanical properties of metal especially when involved in high temperature service. X-ray CT Scan was used to study the internal behaviour of oxidized welded joint after exposed to high temperature environment. It was observed that the effect of temperature accelerates the degradation behaviour in welded zone compared with base metal. Protective behaviour was found to develop on parent metal side, while non-protective oxide formed on fusion metal of the welded alloy showing a porous surface structure.