اثر زاویه سطح شانه ابزار روی خواص اتصال در جوشکاری اصطکاکی اغتشاشی آلیاژ آلومینیوم 5052

محورهای موضوعی : روش ها و فرآیندهای نوین در تولید

فرهاد غروی ¹ (استاد یار)

تاریخ دریافت : 1396/01/12 تاریخ پذیرش : 1396/09/19 تاریخ انتشار : 1396/09/01

کلید واژه: جوشکاری اصطکاکی اغتشاشی, آلومینیوم 5052, اتصالات لبه رویهم, عیب قلاب, خواص کششی-برشی,

چکیده مقاله :

در این تحقیق، جوشکاری اصطکاکی اغتشاشی با طرح اتصال لبه رویهم آلیاژ آلومینیوم 5052 اجرا گردید و اتصالات جوش لبه رویهم توسط سرعت پیشروی 63 میلیمتر بر دقیقه و سرعت چرخش ابزار 1450 دور بر دقیقه ساخته شدند. سه نوع ابزار با زاویه سطح شانه متفاوت (صفر، 5 و 10 درجه) طراحی و استفاده شد. تاثیر زاویه سطح شانه بر خواص اتصال جوش بوسیله میکروسکوپ نوری و آزمون کشش-برش مورد مطالعه قرار گرفت. نتایج نشان داد که در زاویه سطح شانه صفر درجه، یک کانال پیوسته در سمت پیشرونده نزدیک به دکمه جوش ایجاد و در طول خط جوش گسترده شد. اتصال لب رویهم با بیشترین استحکام شکست، کوچک ترین اندازه قلاب و در طی آزمون برشی کششی، شکست از محل عیب قلاب نبوده و در فصل مشترک ورق ها رخ داده است. اندازه عیب قلاب (Hook) و ضخامت موثر ورق (EPT) با زیاد شدن زاویه سطح شانه به ترتیب از 5/4 به 2 و از 25/2 به 1 کاهش یافتند در حالی که بالاترین خواص کششی-برشی در زاویه سطح شانه برابر با 10 درجه به 4650 نیوتن بر میلیمتر رسید.

چکیده انگلیسی:

Friction stir lap welding of 5052 aluminum alloy was performed in the present research, and lap joints were fabricated by rotational speed of 1450 rpm and welding speed of 63 mm/min. Three tools with different shoulder surface angle (i.e. 0, 5, and 10 degrees) were designed and used. The effect of shoulder surface angle on joint properties was studied by optical microscopy and tensile-shear test. The results showed that only at angle of shoulder surface of zero-degree a continuous channel-like void was formed in the advancing side near the nugget zone and extended along the welding direction. The lap joints with the highest fracture strength has the smallest hook size, and is fractured at fraying surface rather than in the hook defect during tensile-shear test. Hook size and effective plate thickness (EPT) decreased from 4.5 to 2 and 2.25 to 1, respectively, as the angle of shoulder surface increased while the highest tensile-shear properties were obtained around 4650 N/mm at angle of shoulder surface of 10 degrees.

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