مقاله شبیه سازی جوشکاری مقاومتی نقطه ای با عنوان : THE FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDINGقسمتی از چکیده:THE FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDING ABSTRACT Resistance spot welding process is the most significant joining process in the automobile industry due to its high speed and suitability for automation. One of the recent demands in the automobile industry is to reduce the vehicle weight so as to improve the fuel efficiency and to meet this requirement, aluminium alloys is being considered as an important alternative for auto-body material. The vehicle corrosion problem can also be squarely dealt with. However, unlike resistance spot welding of steel, joining of aluminium through the same process has met with serious difficulties, because of faster deterioration of electrodes. High electrical and thermal conductivity, high shrinkage during solidification and the presence of natural oxide coating are some of the features that make spot welding process of aluminium alloys markedly different. At a very high temperature aluminium chemically reacts with copper alloy (electrode material). Subsequently random chipping-off of material from the electrode faces takes place and it results in electrode wear. Further, the electrode life reduces drastically when spot welding aluminium alloys. In terms of weldability, this is an extreme negative point since weldability for automobile use is greatly dictated by electrode tip life.
مقاله شبیه سازی جوشکاری مقاومتی نقطه ای با عنوان : THE FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDINGقسمتی از چکیده:THE FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDING ABSTRACT Resistance spot welding process is the most significant joining process in the automobile industry due to its high speed and suitability for automation. One of the recent demands in the automobile industry is to reduce the vehicle weight so as to improve the fuel efficiency and to meet this requirement, aluminium alloys is being considered as an important alternative for auto-body material. The vehicle corrosion problem can also be squarely dealt with. However, unlike resistance spot welding of steel, joining of aluminium through the same process has met with serious difficulties, because of faster deterioration of electrodes. High electrical and thermal conductivity, high shrinkage during solidification and the presence of natural oxide coating are some of the features that make spot welding process of aluminium alloys markedly different. At a very high temperature aluminium chemically reacts with copper alloy (electrode material). Subsequently random chipping-off of material from the electrode faces takes place and it results in electrode wear. Further, the electrode life reduces drastically when spot welding aluminium alloys. In terms of weldability, this is an extreme negative point since weldability for automobile use is greatly dictated by electrode tip life.