Analisis Pengaruh PWHT Terhadap Sifat Mekanik Hasil Pengelasan SMAW Pada Baja ST41 Dengan Variasi Temperature dan Waktu Tahan Melalui Uji Impact dan Metalografi.

Putra, Nungki Dwi (2021) Analisis Pengaruh PWHT Terhadap Sifat Mekanik Hasil Pengelasan SMAW Pada Baja ST41 Dengan Variasi Temperature dan Waktu Tahan Melalui Uji Impact dan Metalografi. Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

The welding process creates a local heating effect with a high temperature that causes the metal to experience thermal expansion and shrinkage when cooling. This causes residual stresses that arise after welding. It is necessary to find a way to eliminate the residual stresses that arise and to improve the microstructure by using PWHT. The aims of this study were (1) to determine the effect of Post Weld Heat Treatment on the toughness of ST41 steel welding results, (2) to determine the effect of variations in temperature and holding time of Post Weld Heat Treatment on the microstructure of ST41 steel welding results, (3 ) Knowing the effect of temperature and holding time of Post Weld Heat Treatment on the toughness of ST41 steel material welding results. In this study used ST41 steel material with a thickness of 10 mm. The welding process uses SMAW welding with E7018 electrodes. PWHT temperature variations used are 7000C, 7500C, 8000C with holding times of 45 minutes, 70 minutes, 95 minutes. Furthermore, impact and metallographic tests were carried out to determine the material's toughness and microstructure after the PWHT process was carried out. The results of the impact test showed an increase in the impact price on ST 41 Steel from the welding process after PWHT was carried out. ST 41 steel specimens without PWHT process showed an impact value of 1,316 Joule/mm2 while ST.41 steel specimens with variations in temperature and holding time showed the highest impact value obtained from a temperature of 8000C with a holding time of 95 minutes with an impact price of 2,453 Joule/mm2 It can be concluded that the PWHT process can increase the toughness of the welded material. Based on the results of the microstructure test, with variations in temperature and holding time used, there is a change in grain size in the weld metal area. In addition, there is a decrease in the percentage of pearlite and an increase in the percentage of ferrite. Where this can reduce the hardness and increase the toughness of the material which makes the material more ductile.

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