مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

تأثیر فلز پرکننده بر رفتار مکانیکی اتصال جوش فولاد زنگ نزن به روش جوشکاری قوسی تنگستن -گاز GTAW

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، گروه مهندسی مکانیک، دانشگاه پیام نور، تهران، ایران
2 کارشناسی ارشد، گروه مهندسی مکانیک، موسسه آموزش عالی علوم و فنون خوارزمی، قشم، ایران
چکیده
اتصال جوش فولاد زنگ نزن SS-316 در صنایع نفت و گاز از اهمیت بالایی برخوردار است. در این تحقیق، جوشکاری فولاد زنگ نزن 316L بـا اسـتفاده از روش قوسی تنگستن - گاز خنثی، با هدف ارزیابی رفتار مکانیکی فلزات پرکننده مورد بررسی قرار گرفت. برای این منظور از سه فلز پرکننده ER309L، ER316L و ER309LMo استفاده گردید. ریز ساختار، آزمون کشش، سختی و مقاومت به ضربه اتصال جوش مورد بررسی و مطالعه قرار گرفت. نتایج ریز ساختار نواحی مختلف جوش نشان داد ساختار جوش سه نوع فلز پرکننده مشابه و دارای ساختار آستنیت و فریت دلتا می‌باشد و تفاوت اندکی در میزان توزیع فریت دلتا در زمینه آستنیتی وجود دارد. نتایج سختی­سنجی نشان داد میانگین سختی فلز پرکننده ER309LMO (205 ویکرز) بیشتر از میانگین سختی فلزات پرکننده ER316L (197 ویکرز) و ER309 (189 ویکرز) بود. همچنین سختی ناحیه متأثر از حرارت اتصال فولاد 316L در هر سه فلز پرکننده افزایش داشت. استحکام نهایی اتصال هر سه فلز پرکننده بالاتر از 545 مگاپاسکال بود به ‌طوری ‌که نمونه کششی از محل فلز پایه دچار شکست شد. میانگین انرژی ضربه (156 ژول) فلز جوش ER316L بیشتر از میانگین انرژی ضربه (96 ژول) فلز جوش ER309L و میانگین انرژی ضربه (58 ژول) فلز جوش ER309LMO بود و این کاهش انرژی ضربه دو فلز جوش ER309 ناشی از ریز ساختار فریت دلتا می‌باشد. استفاده از فلز پرکننده ER316L با طراحی اتصال V به علت بهبود انرژی ضربه، فلز پرکننده مناسب‌تری برای این اتصال می‌باشد.
کلیدواژه‌ها

عنوان مقاله English

The effect of filler metal on the mechanical behavior of stainless steel welded by GTAW welding

نویسندگان English

Moslem Mohammadi Soleymani 1
Hosna Mostafaei 2
1 Assistant Professor, Department of Mechanical Engineering, Payame Noor University (PNU), Tehran, Iran
2 MSc, Department of Mechanical Engineering, Kharazmi Institute of Higher Education of Sciences and Techniques, Qeshm, Iran
چکیده English

Welding connection of 316L stainless steel has great importance in the oil and gas industry. In this research, welding of 316L stainless steel was investigated using GTAW with the aim of evaluation of the mechanical behaviour of filler metals. Three filler metals of ER309L, ER316L and ER309LMO were used for this purpose. The microstructure results of different regions of welding sections showed that welding structures of three types of filler metals are similar and have structure of Austenite and Ferrite delta. Also, there is a slight difference in the distribution amount of Ferrite delta in the Austenite background. Hardness evaluation results showed that the average hardness of filler metal of ER309LMO is higher than average hardness of filler metals of ER316L and ER309. Also, hardness of impacted region by connection heat of 316L steel in each of filler metals had been increased. The final strength of connection of all three filler metals was higher than 545 MPa. It was in such a way that sample of tensile test was failed and ruptured in the base metal location. The average of impact energy was (156J) for weld metal of ER316L which was higher than average of impact energy (96J) for weld metal of ER309L and average of impact energy (58J) for weld metal of ER309LMO. This reduction in impact energy in two weld metal of ER309 is due to microstructure of Ferrite delta. Using filler metal ER316L with V connection design is better for this connection due to improved impact energy.

کلیدواژه‌ها English

Filler Metal
Mechanical Behavior
316-Stainless Steel
GTAW Welding
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