Tungsten inert gas (TIG) welding of aluminum alloy EN AW-AlZn5.5MgCu

Abstract

The paper presents the results of tungsten inert gas (TIG) welding of aluminium alloy 7075-T6 in the butt joint, with single-V edge preparation. The sample dimensions were 100 × 75 × 20 mm3. The TIG welding was done with 2 mm diameter filler wire made of 5183 (AlMg4,5Mn) at four preheating temperatures. During the welding a temperature was measured at six locations with thermocouples. For successfully welded samples tensile test were done and microstructure of base metal, heat affected zone and weld was analysed. The welds brake at heat affected zone between base metal and the weld. The optimal preheating temperature was at 200 °C.

Keywords

• TIG welding
• aluminium alloy 7075–T6
• repair welding of tools
• preheating temperature
• microstructure
• tensile test