تاثیر ترکیبات بین فلزی‌ بر استحکام جوش‌های غیر‌همجنس اصطکاکی تلاطمی نقطه‌ای آلومینیم/فولاد

نوع مقاله : علمی و پژوهشی

نویسندگان

دانشگاه صنعتی شریف

چکیده

هدف از این تحقیق، بررسی تاثیر ترکیبات بین فلزی‌ بر استحکام جوش‌های اصطکاکی تلاطمی نقطه‌ای آلومینیم- فولاد بوده است. متغیرهای فرایند، سرعت چرخشی و زمان ماند ابزار بودند. بررسی‌های ریزساختاری فصل مشترک اتصال توسط میکروسکوپ‌های نوری و الکترونی روبشی انجام پذیرفت. نتایج آزمون کشش-برش نشان داد که در تمامی سرعت‌های چرخشی مورد استفاده، استحکام اتصالات با افزایش زمان ماند، افزایش می‌یابد. علاوه بر این، در زمان‌های ماند مشابه، سرعت‌های چرخشی بالاتر منجر به دست‌یابی به اتصالات مستحکم‌تری گردید. مشاهدات ریزساختاری فصل مشترک اتصال، نشان داد که رشد ضخامت لایه بین فلزی تا 5 میکرومتر منجر به افزایش استحکام جوشها می‌گردد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Intermetallic Compounds on the Strength of Dissimilar Friction Stir Spot Welded Al/Steel Joints

نویسندگان [English]

  • Eskandar Fereiduni
  • Mojtaba Movahedi
  • Amir-Hossein Kokabi
Sharif University of Technology
چکیده [English]

The aim of the present study is to investigate the effect of Al-Fe intermetallic compounds on the strength of friction stir spot welded (FSSW) joints. The tool rotational speed and dwell time were the studied process parameters. The microstructure of the joint interface was characterized using optical and scanning electron microscopes. Tensile-shear testing results showed that the strength of the welds improved with the enhancement of dwell time for all of the applied rotational speeds. Furthermore, for a given dwell time, higher rotational speeds led to stronger joints. Microstructural observations revealed that the strength of the welds increased with the growth of the intermetallic layer thickness up to 5 µm.

کلیدواژه‌ها [English]

  • Al-5083
  • St-12
  • Friction Stir Spot Welding
  • Intermetallic compounds
  • Tensile-Shear Strength
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