بررسی تجربی خواص مکانیکی متأثر از جوشکاری اصطکاکی اغتشاشی نقطه‌ای غیر همجنس آلیاژ آلومینیوم 6061-T6 به مس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی مکانیک، دانشگاه زنجان، زنجان، ایران

2 فارغ‌التحصیل کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه زنجان، زنجان، ایران

3 دانشجوی دکتری، گروه مهندسی مکانیک، دانشگاه زنجان، زنجان، ایران

10.22034/ijme.2023.413891.1824

چکیده

جوشکاری اصطکاکی اغتشاشی نقطه‌ای (FSSW) یکی از انواع روش‌های جوشکاری حالت جامد جهت اتصال قطعات و فلزات سبک بخصوص آلیاژهای آلومینیوم و مس محسوب می‌شود. در این تحقیق تأثیر پارامترهای مهم فرآیند جوشکاری FSSW از قبیل سرعت دورانی و زمان توقف ابزار بر خواص مکانیکی و میکرو سختی سنجی اتصالات غیر همجنس آلیاژ آلومینیوم 6061 به مس خالص تجاری مورد بررسی قرار گرفته است. همچنین تأثیر نحوه قرارگیری ورق‌ها بر خواص مکانیکی مطالعه شده است. نتایج نشان می‌دهد با افزایش سرعت دورانی ابزار از 1250 به 1600 دور در دقیقه و زمان توقف ابزار از 5 به 10 ثانیه استحکام کششی و خمشی تمامی نمونه‌های جوشکاری شده افزایش میابد. همچنین در سرعت‌های دورانی کمتر از 1250 دور در دقیقه به دلیل کاهش تولید حرارت اصطکاکی و بالاتر از 1600 دور در دقیقه به دلیل تولید حرارت بالاتر از حد، کیفیت اتصالات کاهش یافته است. نتایج میکرو سختی سنجی نشان می‌دهد در پارامترهای مختلف جوشکاری با افزایش سرعت دورانی و زمان توقف ابزار باعث ایجاد دانه‌های ریز و تبلور مجدد یافته در منطقه اغتشاشی و دیگر نواحی شده، که این مسئله در اثر حرارت تولیدی ناشی از اصطکاک و تغییر فرم شدید ماده در حین جوشکاری میباشد. نتایج به دست آمده نشان می‌دهد در حالتی که مس بالا و آلومینیوم پایین باشد استحکام تسلیم و نهایی کشش به بیشترین مقادیر خود به ترتیب ۱۴۲ و ۱۸۸ مگاپاسکال می رسد.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental investigation on mechanical properties affected by dissimilar friction stir spot welding of aluminum 6061-T6 alloy to copper

نویسندگان [English]

  • Davood Afshari 1
  • Hasan Modaresinia 2
  • Moahmmad Karimi Ivanaki 3
  • Mohammad Mahdi Entezarian 2
1 Associate Professor, Department of Mechanical Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
2 MSc Graduate, Department of Mechanical Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
3 PhD Student, Department of Mechanical Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
چکیده [English]

Friction stir spot welding (FSSW) is one of the types of solid state welding methods for joining parts and light metals, especially aluminum and copper alloys. In this research, the effect of important parameters of the FSSW welding process, such as rotational speed and tool stop time, on the mechanical and micro- hardness properties of dissimilar connections of aluminum alloy 6061 to commercial pure copper has been investigated. Also, the effect of the placement of the sheets on the mechanical properties has been studied. The results show that by increasing the rotational speed of the tool from 1250 to 1600 rpm and the stopping time of the tool from 5 to 10 seconds, the tensile and bending strength of all welded samples increases. Also, at rotational speeds less than 1250 rpm due to the reduction of frictional heat generation, and higher than 1600 rpm due to excessive heat generation, the quality of connections has decreased. The results of micro- hardness measurement show that in various welding parameters, increasing the rotational speed and stopping time of the tool caused the creation of fine grains and recrystallization found in the stir zone and other areas, which is due to the heat produced due to friction and severe material change in shape. The obtained results show that at high aluminum and low copper, the yield strength and ultimate tensile strength reach their highest value, of 142 MPa and 188 MPa respectively.

کلیدواژه‌ها [English]

  • Friction Stir Spot Welding
  • Welding Parameters
  • AA6061-T6
  • Copper
  • Mechanical Properties

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