نوع مقاله : مقاله پژوهشی
1 دانشیار، گروه مهندسی مواد و متالورژی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.
2 دانشجوی کارشناسی ارشد مهندسی موادو متالورژی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.
عنوان مقاله [English]
In the present study, ASTM A516-Grade 70 steel sheets were coated using E410 and E309 electrodes via Shielded Metal Arc Welding (SMAW) process in different number of welding passes. To evaluate the microstructure and properties of the clad layer, metallographic examinations, hardness test, wear test and scanning electron microscope (SEM) from the worn surfaces were used. Microstructural examinations revealed that, all the samples contain ferrite and martensite in the microstructure with different volume fraction. The results showed that, the volume fraction of martensite increased by increasing the number of welding passes. Also, the results of hardness test revealed an increase in the hardness by increasing the number of the number of welding passes. Wear test results showed that, for some samples with higher hardness value, wear resistancewas decreased. Evaluation of the worn surfaces revealed that, in the case of the sample welded using E410 electrode without interlayer, abrasive and oxidative wear mechanisms were dominated. In the case of the sample welded using E309 electrode interlayer and E410 overlay, abrasive, oxidative and galling were observed.