Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 30, No. 10 (October 2017) 1592-1598    Article in Press

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  EFFECT OF DIFFERENT WELDING PARAMETERS ON THE MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF STAINLESS STEEL 304H WELDED JOINTS
 
S. A. Rizvi and S. P. Tewari
 
( Received: April 18, 2017 – Accepted in Revised Form: July 07, 2017 )
 
 

Abstract    In this research work, an attempt has been made to examine the different welding parameters which affect the weldability of 304H Austenitic stainless steel (ASS) welded joint using the proper filler wire. Chemical composition of filler wire was same as that of base metal. Further this study addressed the combined effect of various welding parameters on the metallurgical and mechanical properties of the weldments. Welding was carried out at different parameters such as welding wire speed, shielding gas flow rate, welding current and arc voltage etc. Tensile tests and V-notch Charpy tests were conducted as per ASTM to determine the mechanical properties of the welded specimens. In order to determine the microstructured changes that occurred, the interface regions of the welded specimens were examined by microscope. As a result, it is reported that changing the shielding gas flow rate and wire feed speed affects the microstructure and mechanical properties of weldment. Impact tests reveal that toughness of the welded joint increases with increasing in welding current, while ultimate tensile strength (UTS) first increases and then decreases.

 

Keywords    GMAW, Shielding gas, mechanical properties, morphology, SS, ferrite.

 

چکیده    در اين تحقيق تلاش شده است كه پارامترهاي جوش مختلفي كه بر جوشكاري فولاد ضدزنگ آستنيتي (ASS)304 H جوش داده شده با استفاده از سيم پركن تاثیر گذارند، مورد بررسي قرار گیرند. ترکیب شیمیایی سیم پرکننده همانند فلز پایه بود. علاوه بر این، این مطالعه به ترکیب اثر پارامترهای مختلف جوش بر خواص متالورژیکی و مکانیکی نقاط جوش داده شده اشاره دارد. جوشکاری با پارامترهای مختلف مانند سرعت سیم جوش، سرعت جریان گاز محافظ، جریان جوش و ولتاژ قوس و غیره انجام شده است. آزمونهای کششی و آزمایشات V-notch Charpy بر اساس ASTM برای تعیین خواص مکانیکی نمونه های جوش انجام شده است. به منظور تعيين تغييرات ريز ساختاري که رخ داد، مناطق خطوط رابط نمونه هاي جوش داده شده با استفاده از ميکروسکوپ مورد بررسي قرار گرفتند. در نتیجه، گزارش شده است که تغییر جریان گاز محافظ و سرعت انتقال سیم بر ریزساختار و خواص مکانیکی جوش تاثیرگذار است. آزمون های ضربه نشان می دهد که چقرمگی نقاط جوش داده شده با افزایش جریان جوش افزایش می یابد، در حالی که UTS ابتدا افزایش و سپس کاهش می یابد.

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