بهینه‌یابی پارامترهای جوشکاری مقاومتی سربه‌سر میلگردهای فولادی: مطالعه خواص مکانیکی و ریزساختار

مهندسی متالورژی و مواد

مقاله 6، دوره 36، شماره 2 - شماره پیاپی 38، خرداد 1404، صفحه 73-92   

نوع مقاله: علمی و پژوهشی

شناسه دیجیتال (DOI): 10.22067/jmme.2025.92300.1192

نویسندگان

هدی میرسیفی¹؛ حامد قوهانی عرب^{* 1}؛ محمود شریفی تبار²

¹گروه مهندسی عمران، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران

²گروه مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه حکیم سبزواری، سبزوار، ایران

چکیده

پژوهش حاضر تأثیر پارامترهای فرآیند جوشکاری مقاومتی سربه‌سر (RUBW)1 بر اتصال میلگردهای فولادی با قطرهای مختلف را بررسی می‌کند. ارزیابی‌های انجام‌شده شامل ریزساختار، استحکام کششی نهایی، درصد ازدیاد طول نسبی، و سختی موضعی نمونه‌های جوش داده شده است. بهینه‌سازی پارامترها با استفاده از روش طراحی مرکب مرکزی (CCD)2 و الگوریتم جمعیت ذرات (PSO)3 انجام شد. حداکثر استحکام کششی نهایی 628 مگاپاسکال و ازدیاد طول 25 درصد در شرایط بهینه برای قطر میلگرد 18 میلی‌متر، شدت جریان 8460 آمپر، و فشار جوش 64/1 مگاپاسکال به‌دست آمد. تحلیل واریانس نشان داد که مدل درجه دوم برای استحکام کششی نهایی و مدل خطی برای ازدیاد طول نسبی، پیش‌بینی‌های دقیقی ارائه می‌دهند. الگوریتم PSO برای تعیین پارامترهای ورودی بهینه استفاده و نتایج آن با روش CCD مقایسه شد. نرم‌افزار JMatPro برای بررسی نوع فازها و مقایسه با مشاهدات تجربی به کار رفت. نتایج نشان داد که فصل‌مشترک دارای دانه‌های فریت سوزنی و ناحیه متأثر از حرارت دارای ریزساختار دانه درشت فریت-پرلیت است.

کلیدواژه‌ها

جوش حالت جامد؛ طراحی آزمایشات؛ پاسخ بهینه؛ توزیع سختی؛ تحلیل واریانس

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