بررسی تجربی اثر انرژی ورودی بر استحکام اتصال جوشی غیر هم‌جنس اینکونل 713LC و فولاد 4140 به روش جوشکاری پرتو الکترونی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشکدگان فنی دانشگاه تهران، تهران، ایران

2 دانشیار، دانشکده مهندسی مکانیک، دانشکدگان فنی دانشگاه تهران، تهران، ایران

چکیده

موتورهای توربینی عمدتاً دارای اتصال جوشی غیر هم‌جنس به روش‌های گوناگون جوشکاری ذوبی هستند. در این تحقیق انرژی ورودی به‌عنوان پارامتر اصلی با تغییر در ولتاژ و جریان پرتو با ثابت گرفتن سرعت جوشکاری mm/s6 و شعاع پرتو الکترونی یک میلی‌متری بروی فرایند جوشکاری پرتو الکترونی مورد بررسی قرار گرفتند. کیفیت اتصال نمونه‌ها پس از جوشکاری، با سه مشخصه تست کشش و هندسه جوش (عمق نفوذ) همراه با بررسی سطح شکست تعیین گردید. مشاهده گردید که با افزایش انرژی ورودی عمق نفوذ و نیروی کششی اتصال افزایش می‌یابد. در تست کشش نمونه‌ها نیروی کششی سه نمونه، بیش از 80 درصد فلز پایه را نشان دادند. همچنین نشان داده شد که شکست در تمامی نمونه‌ها از ناحیه فصل مشترک فولاد 4140 با منطقه جوش رخ ‌داده است؛ به­‌طوری­‌که با افزایش انرژی ورودی منطقه متأثر از حرارت در فصل مشترک فولاد 4140 افزایش می‌یابد. در مقایسه دو نمونه با ولتاژ یکسان و آمپر متفاوت و همچنین آمپر یکسان و ولتاژ متفاوت نشان داده شد که اثر آمپر بر استحکام جوش به‌مراتب بیشتر از ولتاژ است. در بررسی سطوح شکست نیز مشاهده گردید که در مقادیر انرژی بالاتر از J/mm 230 انعطاف‌پذیری جوش کاهش می‌یابد؛ علت آن درجه حرارت بالا بر اثر افزایش انرژی ورودی و نرخ سرد شدن سریع منطقه جوش است. با توجه به نتایج این تحقیق شرایط بهینه استحکام و عمق نفوذ جوش مناسب در نمونه V40I40 با انرژی جوش J/mm 267 مشاهده گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental investigating the effect of heat input on the strength of dissimilar welded joints of IN 713LC and AISI 4140 by electron beam welding method

نویسندگان [English]

  • Hamidreza Banooei 1
  • Mohammadreza Farahani 2
1 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
چکیده [English]

Turbine engines mainly have non-homogeneous welded joints with various fusion-welding methods. In this research, the input energy was investigated as the main parameter with different in the voltage and beam current with welding speed of 6mm/s and focal radius of 1mm of the electron beam welding process. The connection quality of the samples after welding was determined with three characteristics of tension test and welding geometry along with examination of the fracture surface. It was observed that with the increase of input energy, the depth of penetration and the tensile strength of the connection increased. In this tensile test, three samples showed a tensile load of more than 80% of the base metal. It was also shown that failure in all the samples occurred from the interface area of 4140 steel with the fusion zone. With the increase of input energy, the heat affected zone increases. Comparing two samples with the same voltage and different beam current, and two samples with the same beam current and different voltage, shown that the influence of the beam current on the joint strength is significantly higher than the effects of beam voltage. Fractography shown that for the beam energy higher than 230 J / mm, the weld flexibility decreases. It can be explained by the high temperature and fast cooling rate in fusion zone for this sample. It was also shown that the acceptable tensile strength and suitable depth of penetration obtained in V40I40 sample with the beam energy of 267 J / mm.

کلیدواژه‌ها [English]

  • Electron beam
  • welding EBW
  • Tensile load
  • Inconel-713LC
  • AISI-4140

مراجع

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