Teknologi pengelasan dalam pembuatan pressure vessel saat ini sangat berkembang dengan pesat dimana untuk memperoleh hasil pengelasan yang berkualitas maka dilakukan perlakuan khusus pada pressure vessel tersebut diantaranya yaitu proses Post Weld Heat Treatment (PWHT). Proses PWHT wajib dilakukan terutama dalam proyek-proyek Oil
Welding technology in the pressure vessel fabricating process is rapidly developed nowadays, which is needed to obatain the qualified result of the weldments, so that the special treatment for the pressure vessel such as post weld heat treatment(PWHT) must applied. PWHT process must be done especially in the oil and gas, petrochemical, power plant projects, etc. Based on the Welding Technology of Australia (WTIA), one of the applicable method to substitute the PWHT process is a method called Temper Bead Welding (TBW). In this final project, results of PWHT process will be compared to the results of TBW, both alternate temperbead technique and weld toe tempering technique. Material used in this project is SA 516 grade 70 with GMAW process. PWHT process itself will be done in a furnace with 595 oC holding temperature, and the holding time applied is 1 hour. Welding technique from both methods will compared through some tests such like hardness test, impact test, and metallography test to make sure how exactly is the fluence of TBW method can substitute the PWHT process. Results that obtained from this final project is , microstructure in the HAZ become fine grain ? shape. It?s relates to the hardness value that tend to be more ductile caused by tempering process that occured in the HAZ. With average hardness value at the PWHT is 170,12 HVN, 212,47 HVN at the alternate temper bead technique, 221,21 HVN at the weld toe tempering technique. Hardness value in the temperbead welding is much more higher than the PWHT process. Whereas impact testing at a temperature of -15oC shows the greater differential between PWHT process is 1,5 J/mm2, and TBW ? weld toe tempering technique 0,94 J/mm2, so that the impact value differential between PWHT process and TBW process is 0,56 J/mm2. From those differential values between PWHT process and TBW process, we may conclude that TBW methods not yet applicable to substitute the PWHT process.
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