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

نوع مقاله : علمی و پژوهشی

نویسندگان

• هدی میرسیفی ¹
• حامد قوهانی عرب ¹
• محمود شریفی تبار ²

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

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

10.22067/jmme.2025.92300.1192

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

موضوعات

• متالورژی جوشکاری

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عنوان مقاله [English]

Optimization of Resistance Upset Butt Welding Parameters of Steel Rebars: A Study on Mechanical Properties and Microstructure

نویسندگان [English]

• Hoda Mirseifi ¹
• Hamed Ghohani Arab ¹
• Mahmood Sharifitabar ²

¹ Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran

² Materials Engineering Department, Hakim Sabzevari University, Sabzevar, Iran

چکیده [English]

This study investigates the effect of resistance upset butt welding (RUBW) process parameters on the joining of steel bars with different diameters. The conducted evaluations included microstructure, ultimate tensile strength (UTS), elongation, and localized hardness of the welded specimens. Parameter optimization was performed using Central Composite Design (CCD) and Particle Swarm Optimization (PSO) algorithms. The maximum ultimate tensile strength of 628 MPa and an elongation of 25% were achieved under optimal conditions for an 18-mm-diameter rebar, a welding current of 8460 A, and a welding pressure of 1.64 MPa. Analysis of variance showed that the quadratic model provided accurate predictions for ultimate tensile strength, while the linear model was accurate for elongation. The PSO algorithm was used to determine the optimal input parameters, and its results were compared with those from the CCD method. The JMatPro software was used to analyze the phase types and compared with experimental observations. The results showed that the joint interface contained needle-shaped ferrite grains and the heat affected zone exhibited a coarse-grained ferrite-pearlite microstructure.

کلیدواژه‌ها [English]

• Solid-state welding
• Design of experiments
• Optimal Response
• Hardness distribution
• Variance analysis

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