مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل پارامترهای فرایند جوشکاری لیزر فویل فولاد زنگ‌نزن توسط روش آماری رویه پاسخ به‌منظور اتصال صفحات دوقطبی پیل‌سوختی پلیمری

نویسندگان
محمدرضا پاک منش 1
مرتضی شمعانیان 2
سعید اصغری 1
1 پژوهشگاه فضایی ایران
2 دانشگاه صنعتی اصفهان
چکیده
در تحقیق حاضر، تاثیر پارامترهای جوشکاری لیزر پالسی Nd:YAG بدون فلز پرکننده بر روی اتصال لبه‌روی‌هم فویل فولاد زنگ‌نزن 316L با ضخامت 100 میکرومتر جهت کاربرد در صفحات دوقطبی پیل‌سوختی پلیمری مورد بررسی قرار گرفت. بدین‌‌منظور از ابزارهای آماری، آنالیز واریانس و نمودارهای مختلف جهت تحلیل داده‌ها توسط روش رویه پاسخ استفاده گردید. پارامترهای ورودی توان قله (130 تا 650 وات)، زمان روشنی پالس (1.5 تا 3.5 میلی‌ثانیه) و فرکانس جوشکاری (14 تا 18 هرتز) در نظر گرفته شد. روش آماری مذکور به‌خوبی توانست، با توسعه چندجمله‌ای درجهٴ دوم، تأثیر پارامترهای جوشکاری را پیش‌بینی نماید؛ به‌طوری‌که مجموع خطا شامل خطای تکرارپذیری و خطای عدم تطابق برای مدل استحکام برشی، مدل بریدگی کنار جوش و مدل پرنشدگی جوش به‌ترتیب 2، 8 و 3 به دست آمد. مهم‌ترین عوامل مؤثر بر استحکام برشی، عیوب بریدگی کنار جوش و نفوذ ناقص تشخیص داده شد. توان لیزر اصلی‌ترین پارامتر در این فرآیند برآورد گردید و اثر آن بر استحکام برشی جوش، بریدگی کنار جوش و پرنشدگی جوش به‌ترتیب 64، 62 و 66 درصد محاسبه شد. در نهایت حداکثر استحکام برشی به‌ میزان 522 مگاپاسکال در توان قله 260 وات، زمان روشنی پالس 3 میلی‌ثانیه و فرکانس 17 هرتز به‌دست آمد. در این‌حالت بریدگی کنار جوش به 3 میکرومتر رسید.
کلیدواژه‌ها
جوشکاری لیزر پالسی
روش رویه پاسخ
عیوب جوش
استحکام برشی جوش
صفحات دوقطبی پیل‌سوختی پلیمری

موضوعات

عنوان مقاله English

Analysis of the laser welding parameters of stainless steel foil by statistical response surface methodology for joining PEMFC bipolar plates

نویسندگان English

Mohammad Reza Pakmanesh 1
Morteza Shamanian 2
Saeid Asghari 1
1 Institute of Materials and Energy, Iranian Space Research Center, Isfahan, Iran
2 Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده English

In the present study, the effect of parameters of autogenous pulsed Nd: YAG laser welding process on the lap joint of a 316L stainless steel foil with a thickness of 100 µm to be used as bipolar plates of polymeric fuel cell was investigated. For this purpose, the statistical tools, the analysis of variance and the various diagrams were used to analyze the data by response surface methodology. The peak power (130 to 650 W), pulse durability (1.5 to 3.5 ms), and welding frequency (14 to 18 Hz) were considered as input parameters. The mentioned statistical method was able to predict the effect of welding parameters by developing second-order polynomials, so that the total error including the repeatability error and the lack of fit error for shear strength model, weld undercut model, and weld underfill model obtained 2, 8 and 3, respectively. The defects of weld undercut and lack of penetration were identified as most important factors affecting the shear strength. The laser power is as the main parameter in this process and the impact of it on the shear strength of the weld, the weld undercut and the weld underfill is calculated 64, 62 and 66%, respectively. Finally, the maximum shear strength with the value of 522 MPa is achieved at a peak power of 260 W, pulsed duration of 3 ms and welding frequency of 17 Hz. In this case, the weld undercut is determined as 3 micrometers.

کلیدواژه‌ها English

Pulsed laser welding
response surface methodology
Weld defects
Shear Strength
PEMFC bipolar plates
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مهندسی مکانیک مدرس
دوره 18، شماره 5
شهریور 1397
صفحه 132-141