a study on effect of process variables onfatigue and impact behavior and bead penetration of robotic MIG welded AA۶۰۶۱ aluminum alloy joints

Aluminum alloys forming to AA۶۰۶۱ have a wide range of desirable properties which are used in different industries such as aircraft industry and other aerospace structures. The effect of processing variables on fatigue life, impact energy and bead penetration of AA۶۰۶۱ joints produced by MIG robotic welding process was analyzed in the present study. Different samples were obtained by employing arc voltages of ۲۰, ۲۳ and ۲۶ V, welding currents of ۱۱۰, ۱۳۰ and ۱۵۰ A, welding speeds of ۵۰, ۶۰ and ۷۰ cm/min. After finishing of the welding process, the mechanical properties of the samples were evaluated by means of fatigue and impact test at room temperature and the depth of weld penetration was measured in all of geometrical specimens. Results were clearly illustrated that when heat input increases, fatigue life of weld metal decreases whereas impact energy of weld metal increases in first and then drops significantly. A linear increase in depth of penetration with increasing welding current and arc voltage was also observed. The biggest penetration in this investigation was observed for ۶۰ cm/min welding speed

کلیدواژه ها:

MIG parameters ، fatigue life ، impact energy ، bead penetration ، welding