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مقاله شبیه سازی جوشکاری مقاومتی نقطه ای با عنوان : 
THE FINITE ELEMENT MODELING OF RESISTANCE SPOT WELDING
قسمتی 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.

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اوقات فراغت معلمان شهریزد با تاکید بر فعالیت های ورزشی و ارتباط آن با فرسودگی شغلی در سال تحصیلی 93-92بررسی میزان تأثیرنظارت ذیحساب بر عملکرد عاملین ذیحساب ناجادانلود کتاب عشق های خنده دارآموزش وردپرس از مبتدی تا فوق حرفه ایپاورپوینت کد بندی کانال به روش همینگهنر افسون كننده ي ژاپني نين جوتسونقد نمایشنامه The Governess by Neil Simonپاور پوینت در مورد چسبمحوطه سازی مکانهای ورزشی‎ ✅فایل های دیگر✅

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