مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی اثر پارامترهای لیزر ND:YAG پالسی و نیروی فشاری اعمالی به درز اتصال، بر هندسه و استحکام جوش در لوله جدار نازک فولاد زنگ نزن316L

نوع مقاله : پژوهشی اصیل

نویسندگان
علیرضا نیکروان
فرهاد کلاهان
محمود شریعتی
دانشگاه فردوسی مشهد
10.52547/mme.22.8.555
چکیده
به دلیل اهمّیت اتصال در تجهیزات تحت فشار و قابلیت­های جوش لیزر، در این تحقیق به بررسی تجربی و تحلیل پارامترهای لیزر پالسی برای جوشکاری لوله­های فولادی زنگ نزن AISI316L پرداخته­ایم. در این راستا فیکسچری برای موقعیت دهی لوله، طراحی و پس از ساخت روی ماشین لیزر نصب گردید. متغیّرهای ورودی شامل پارامترهای تنظیمی پرتوی لیزر (شدت جریان، پهنای پالس، فرکانس) می­باشند. همزمان با آن­ها اثر دو پارامتر دیگر (سرعت دورانی و نیروی فشاری وارد به درز تماس دو لوله در حال جوشکاری) نیز بررسی شده است. متغیّرهای پاسخ (خروجی­ها) شامل عرض، عمق نفوذ و استحکام جوش می­باشند. داده­های تجربی با اجرای آزمایش­های طرح 27L تاگوچی جمع آوری شدند. سپس با برازش توابع رگرسیونی مختلف بر داده­ها، رابطه بین متغیّرهای ورودی با هر یک از مشخصه­های خروجی برقرار گردید. بر اساس تجزیه و تحلیل واریانس، دو پارامتر پهنای پالس و شدت جریان با مجموع بیش از 70% مشارکت، در تغییر هر سه مشخصه­ خروجی تاثیر غالب دارند. همچنین نیروی اعمالی به درز تماس فقط بر عمق نفوذ و استحکام جوش موثر است. در بهینه سازی چند هدفه با توجه به ترتیب اهمّیت­ متغیّرهای خروجی (1-استحکام، 2-عمق نفوذ 3-عرض جوش)، سطح بهینه پارامترهای ورودی تعیین گردید. در پایان نمونه بهینه­ای با جوشکاری لیزر ساخته شد که در مقایسه با نمونه­های طرح آزمایش­، عمق نفوذ آن با ضخامت دیواره لوله متناسب­تر، منحنی مرزهای جوش یکنواخت­تر و استحکام آن به فلز پایه نزدیک­تر می­باشد.

کلیدواژه‌ها
جوشکاری لیزر
طراحی آزمایش
مدلسازی رگرسیونی
آنالیز واریانس
بهینه سازی

موضوعات

عنوان مقاله English

Investigation of the effect of ND:YAG laser pulse parameters and compressive force applied to the seam on geometry and strength of the weld joint in 316L stainless steel thin-walled tube

نویسندگان English

ali reza nikravan
Farhad kolahan
Mahmoud Shariati
ferdowsi university of mashhad
چکیده English

Due to the importance of the joints in the pressurized instruments and the abilities of the laser welding in this study, the welding of AISI316L tubes have been studied and analyzed. In this regard a fixture has been drawn in order to positioning of the tubes and fixed on the welding desk. The welding input parameters includes the laser welding adjusting variables, includes (welding current, welding pulse width, and welding frequency). Moreover, the effect of the two other variables (rotating speed and the force applied to the welding seam) has also been studied. The welding output characteristics comprises the welding width, depth of penetration and welding strength. The experimental data has been collected using L27 Taguchi design. The relation between the process input variables and output characteristics has been established using different regression models. Based on the analysis of variance (ANOVA) results, pulse width and welding current with 70% contribution have an influential effect on all the three response characteristics. Moreover, the seam force has only the influential effect on the depth of penetration and strength. Next, in optimization step based on the importance of the process characteristics (strength, depth of penetration, welding width), the optimized levels have been determined. At the end, the optimized condition has been conducted using laser welding, in comparison of which the samples in the design matrix, the welding depth has a close relation with the thickness of the wall, the welding boundaries smother and the strength has a close value to the base metal.

کلیدواژه‌ها English

Laser Welding
Design of experiment
regression modeling
Analysis of Variance
Optimization
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مهندسی مکانیک مدرس
دوره 22، شماره 8
مرداد 1401
صفحه 555-565