بررسی تجربی عیوب جوش در اتصال کنارهم آلیاژ آلومینیوم با روش جوشکاری اصطکاکی اغتشاشی: بررسی هندسه پین ابزار و پارامترهای فرایندی

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

1 استادیار، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.

2 استادیار، گروه مهندسی مکانیک، دانشکده فنی، دانشگاه بین‌المللی امام خمینی، قزوین، ایران.

چکیده

در این مقاله به بررسی خواص ریزساختاری، مکانیکی و همچنین عیوب موجود در اتصال ورقه‌های آلومینیومی به کمک روش جوشکاری اصطکاکی اغتشاشی پرداخته شده است. ابتدا خواص ریزساختاری ناحیه جوشکاری اصطکاکی بررسی شد و سپس تأثیر پارامترهای فرایند بر خواص ریزساختاری مورد بحث قرار گرفت. نتایج نشان داد اندازه دانه در ناحیه اغتشاشی نسبت به فلز پایه، بسیار بهبود یافته است. سپس تأثیر پارامترهای ورودی فرایند بر اندازه ذرات بررسی شد. عیوب جوش که یکی از مهم‌ترین دلایل شکست اتصالات می‌باشد بررسی شد و تأثیر هندسه پین ابزار و پارامترهای فرایند بر ایجاد عیوب در ناحیه جوشکاری مورد بحث قرار گرفت. نتایج نشان داد ابزار رزوه‌دار در سرعت پیش‌روی بالاتری قابلیت تولید جوش بی‌عیب را دارد و به ترتیب ابزار‌های مربعی، مثلثی مخروطی و مثلثی در مراتب بعدی قرار می‌گیرند؛ به‌طوری‌که در سرعت دورانی 500 دور در دقیقه می‌توان با ابزار رزوه‌دار حتی در سرعت پیشروی 500 میلی‌متر در دقیقه نیز اتصال بی‌عیب تولید کرد درحالی‌که این مقدار برای ابزار مربعی و مثلثی به‌ترتیب 400 و 315 میلی‌متر در دقیقه است. در انتها سختی ناحیه جوشکاری‌شده در نمونه‌های مختلف بررسی شد. سختی فلز جوش به دلیل آنیل شدن و حذف کار سختی انجام‌شده روی ماده پایه (ناشی از فرایند نورد اولیه) پایین‌تر از ماده پایه است و با افزایش نسبت سرعت دورانی به سرعت پیش‌روی ابزار، سختی کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Investigation of Welding Defects in Butt Joining of Aluminum Alloy by Friction Stir Welding: Effects of Tool Pin Profile and Process Parameters

نویسندگان [English]

  • Mostafa Akbari 1
  • Parviz Asadi 2
1 Assistant Professor, Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
2 Assistant Professor, Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran.
چکیده [English]

In this paper, the microstructural and mechanical properties as well as the defects in the joining of aluminum sheets using the friction welding method are investigated. First, the microstructural properties of the friction stir welding zone are investigated, and then the effect of process parameters on the microstructural properties is discussed. The grain size in the stir zone was greatly improved compared to the base metal, which resulted in the improvement of the mechanical properties in this zone. Then, the effect of process parameters on the grain size was investigated. Welding defects, which is one of the most important reasons for joint failure, were investigated and the effect of tool pin profile and process parameters on the formation of defects in the welding area were discussed. For instance, by using the rotational speed of 500 rpm, a defect-free joint can be produced by the threaded pin even in the traverse speed of 500 mm/min, while the amount for the square and triangular pin profiles were 400 and 315 mm/min, respectively. Finally, the hardness of the welded area was studied in different samples. The hardness of the weld metal was lower than that of the base material due to the annealing of hardness which was generated as a result of primary rolling process. The hardness decreased by increasing the ratio of rotational speed to tool traverse speed.

کلیدواژه‌ها [English]

  • Friction stir welding
  • Welding defects
  • 5083 aluminum
  • Microstructure
  • Mechanical properties

مراجع

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فصلنامه علمی کارافن
دوره 19، شماره 1 - شماره پیاپی 57
فنی و مهندسی
خرداد 1401
صفحه 125-143

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سابقه مقاله

  • تاریخ دریافت: 02 خرداد 1400
  • تاریخ بازنگری: 15 شهریور 1400
  • تاریخ پذیرش: 10 مهر 1400

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