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M. Habib Muzzakki
Politeknik Perkapalan Negeri Surabaya
Mechanical Engineering

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ANALISIS HOLDING TIME POST WELD HEAT TREATMENT (PWHT) PADA PENGELASAN MATERIAL SA-213 GRADE T91 DENGAN SA-213 GRADE T22 UNTUK APLIKASI BOILER Imam Khoirul Rohmat; Moh. Syaiful Amri; Mohammad Miftachul Munir; Hendri Budi Kurniyanto; M. Habib Muzzakki
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1304

Abstract

Superheater is one of the boiler components that works to heat the saturated steam coming out of the steam drum, by utilizing hot gases from combustion. In this study using Gas Tungsten Arc Welding (GTAW) and using SA-213 grade T91 and SA-213 grade T22, these two materials require Post Weld Heat Treatment (PWHT). One of the crucial factors in PWHT is holding time, because holding time aims to obtain a homogeneous temperature and homogeneous microstructure and can affect the mechanical properties of the material. This research was conducted to find out how the effect of PWHT holding time on SA-213 grade T91 and SA-213 grade T22 materials on the microstructure and hardness values. The results of the micro test show that the dominance of pearlite and martensite will decrease with increasing holding time, there is also a difference in microstructure grain size that will increase with increasing holding time which is associated with a decrease in value. The test results show that the hardness value will decrease with increasing holding time, especially in the weld metal area, getting the highest hardness value on the weld metal is in the specimen with a holding time of 15 minutes with a hardness value of 237.67 HVN and the lowest hardness value is in the specimen with holding time 45 minutes which is 201.1 HVN.
Perbandingan PWHT dan Non PWHT pada Pengelasan Material SA-213 Grade T91 dengan SA-213 Grade T22 terhadap Struktur Mikro dan Kekerasan Imam Khoirul Rohmat; Moh. Saiful Amri; M. Habib Muzzakki; Hendri Budi Kurniyanto; Mukhlis Mukhlis; Moh. Miftachul Munir
Jurnal Rekayasa Mesin Vol 18, No 1 (2023): Volume 18, Nomor 1, April 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i1.4171

Abstract

Superheater adalah salah satu komponen boiler yang berfungsi untuk memanaskan uap jenuh yang keluar dari steam drum, material yang sering digunakan pada superheater adalah SA-213 grade T91 dan SA-213 grade T22, pada penelitian ini menggunakan proses pengelasan Gas Tungsten Arc Welding (GTAW). Kedua material yang digunakan wajib dilakukan proses PWHT, karena salah satu tujuan PWHT adalah menurunkan nilai kekerasan dan menyeragamkan struktur mikro. Penelitian ini bertujuan untuk mengetahui perbandingan PWHT dan tanpa PWHT pada material SA-213 grade T91 dan SA-213 grade T22 terhadap struktur mikro dan kekerasan. Hasil pengujian struktur mikro menunjukkan adanya pengurangan prosentase pearlite serta martensite dan adanya penambahan ukuran butir struktur mikro setelah PWHT. Pengujian hardness vickers menunjukkan adanya penurunan nilai kekerasan yang signifikan, khususnya pada daerah weld metal dan HAZ antara material tanpa PWHT dan PWHT. Didapatkan nilai kekerasan tertinggi pada weld metal SA-213 grade T91 tanpa PWHT dengan nilai kekerasan 376.70 HVN dan nilai terendah weld metal ada pada spesimen dengan holding time 45 menit yaitu sebesar 201.1 HVN.
Co-Authors Hendri Budi Kurniyanto Imam Khoirul Rohmat Moh. Miftachul Munir Moh. Syaiful Amri Mohammad Miftachul Munir Mukhlis Mukhlis