بررسی عوامل مختلف برعمق نفوذ و پهنای جوش آلیاژ Ti-6Al-4V جوشکاری شده با روش پلاسما

فصلنامه علمی - پژوهشی مواد نوین

مقاله 3، دوره 10، شماره 38، بهمن 1398، صفحه 33-48   

نوع مقاله: مقاله پژوهشی

نویسندگان

یاسر وحیدشاد^* ؛ امیرحسین خدابخشی

پژوهشکده حمل و نقل فضایی، پژوهشگاه فضایی ایران

تاریخ دریافت: 21 مهر 1398،  تاریخ بازنگری: 06 دی 1398،  تاریخ پذیرش: 26 دی 1398 

چکیده

در این تحقیق، عوامل مختلف جوشکاری پلاسما بر روی کیفیت جوش ورق 3 میلی‌متر آلیاژ تیتانیوم Ti-6Al-4V بررسی شده است. این عوامل شامل شدت جریان الکتریکی، سرعت خطی جوشکاری و ترکیب مختلف گاز پلاسما (آرگون ـ هلیوم) است که بر پهنای سطح و ریشه جوش (نشان‌دهنده مقدار حرارت ورودی) موثر می‌باشد. نتایج ماکروگرافی نشان می‌دهد که یک محدوده مشخص از شدت جریان الکتریکی و سرعت خطی وجود دارد که در داخل این محدوده نفوذ جوشکاری مناسب بوده و یک منطقه جوش، بدون هرگونه عیب داخلی و سطحی و با خواص مکانیکی مطلوب بدست می‌آید. همچنین با محافظت موضعی منطقه جوش، سطح دنباله و ریشه جوش با گاز آرگون با خلوص 5N می‌توان از اکسید شدن منطقه جوش و تشکیل اکسید تیتانیوم بر سطح جوش جلوگیری کرد (جوش نقره‌ای رنگ براق). نتایج آزمون مکانیکی نشان می‌دهد که در صورت جوشکاری در داخل محدوده مناسب بدست آمده از عوامل جوشکاری، استحکام کششی فلز جوش نزدیک به فلز پایه می‌باشد. به علت اتوماتیک بودن روش جوشکاری، تکرارپذیری روش جوشکاری پلاسما بسیار مناسب بوده و کیفیت جوش به خوبی قابل کنترل می‌باشد. افزایش مقدار گاز هلیوم باعث گسترش منطقه جوش و عمق نفوذ بالاتر جوش می‌شود. بررسی ریزساختار منطقه جوش نشان می‌دهد که سه ساختار آلفای محصور شده دندانه‌ای، ساختار آلفا ـ بتا (ویدمن اشتاتن) و مارتنزیت در ساختار فلز جوش وجود دارد.

کلیدواژه‌ها

جوشکاری قوس پلاسما؛ ریزساختار؛ آلفای محصور شده؛ مارتنزیت؛ آلیاژ تیتانیوم Ti-6Al-4V

عنوان مقاله [English]

An Investigation of different parameters on the penetration depth and welding width of Ti-6Al-4V alloy by plasma arc welding

نویسندگان [English]

Yaser Vahidshad؛ Amir Hossein Khodabakhshi

Space Transportation Research Institute, Iranian Space Research Center

چکیده [English]

In this investigation, the effect of plasma arc welding (PAW) process parameters on the welding quality of Ti-6Al-4V alloys is studied. These parameters including current, welding linear velocity and plasma gas composition that affected on the weld bead width. Macrograph results indicated that there is a certain range of electric current and linear velocity, which within the range, the full penetration welding obtains, and the weld bead is free from defect. As a result, the mechanical properties are favorable and comparable to those of the base material. It can be protected weld bead from oxidation with argon gas (5N). Furthermore, the automation of the process resulted in repeatability of the plasma arc welding is very good and the weld quality is well controlled. The results indicated that increasing the amount of helium gas, increases the welding area and the higher penetration depth of the weld. Examination of the microstructure of the weld region shows that there are three serrated alpha phase, alpha-beta phase (Widmanstätten) and the martensitic phase in the weld microstructure.

کلیدواژه‌ها [English]

Plasma Arc Welding, Microstructure, Serrated alpha, Martensitic, Ti-6Al-4V titanium alloy

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