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Imam Khoirul Rohmat
Politeknik Perkapalan Negeri Surabaya
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Journal : journal of welding technology

 1 
Weldability of welded joint alloy steel grade 91 to stainless steel grade 316L using filler metal ER NiCrMo-3 and ER 309LMo in power boiler piping and tubing Kurniyanto, Hendri Budi; Rohmat, Imam Khoirul; Muh Sulhan, Ilham Ainur Rosyid; Marzuki, Marzuki
Journal of Welding Technology Vol 6, No 2 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i2.6096

Abstract

Welded joints between high alloy steel and austenitic stainless steel are commonly used in the power plant industry. In this research, the materials used were SA-335 P91 and 316L stainless steel with ERNiCrMo-3 and 309LMo fillers designed with a butt joint configuration. Several mechanical test (tensile test ASTM E8, Hardness Test ASTM E92) and microstructure examination was carried out to determine the tensile strength, hardness and microstructure of welded joint. The highest tensile strength is found in the ERNiCrMo-3 filler metal, namely 354.085 MPa, while the lowest is found in the 309LMo filler metal, namely 349.87 MPa. The highest hardness values for the ERNiCrMo-3 filler metal are found in base metal P91, HAZ P91, weld metal, HAZ stainless steel 316L, and base metal stainless steel 316L, with values respectively 212.77 HVN, 278 HVN, 239.53 HVN , 189.32 HVN, and 180.40 HVN. The lowest values for the 309LMo filler metal are 210.13 HVN, 266.12 HVN, 206.48 HVN, 175.59 HVN, and 172.32 HVN. Microstructural observations show the formation of a dendrite phase in the weld metal area with ERNiCrMo-3 filler metal and a delta ferrite phase in the weld metal area with 309LMo filler metal. No phase changes were observed in the P91 base metal, P91 HAZ, 316L stainless steel base metal, or 316L stainless steel HAZ areas. The results of the corrosion resistance test show that specimens with the ERNiCrMo-3 filler metal are more resistant to pitting corrosion compared to specimens with the 309LMo filler metal. The corrosion rate is 12,50 mm/years for ERNiCrMo-3, and 18,94 mm/years for 309LMo filler metal.
Analysis of variations in the number of layers of hardfacing overlay ABREX 500 material on hardness,impact strength and microstructure with the SMAW process Amri, Moh. Syaiful; Anggara, Dika; rohmat, Imam Khoirul; Kurniyanto, Hendri Budi; Pradana, Dika Septya
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4286

Abstract

Hardfacing is a welding technique that functions to increase the surface hardness value of a material. Generally, hardfacing is done on low-carbon steel materials because low-carbon steel cannot be increased in hardness by heat treatment. For this reason, research will be carried out on the multilayer hardfacing process with the aim of obtaining optimal layer hardness. The methodology in this research is that multilayer hardfacing welding will be carried out consisting of 3 layers, 4 layers, and 5 layers, and each specimen has 2 buffer layer layers with E 309 electrodes for the hardfacing layer using HV 600 electrodes. This research reveals the influence of the number of layers of hardfacing on the hardness and toughness values. ABREX 500 material with a size of 150x150x10 mm was welded using the SMAW process using a current of 130 A. In this research, hardness and toughness tests were carried out. On test results. The base metal microstructure is dominated by a tempered martensite structure with a small amount of bainite and pearlite. In the structural area of the support layer, austenite and vermicular ferrite dominate. In the hardfacing layer area, austenite and vermicular ferrite, which are in dendritic form, dominate. The increase in hardness will occur significantly after hardfacing is carried out on the base metal. In a specimen, the more layers of hardfacing are added, the harder the material will be. The hardness of the specimen in 5 layers gets the most optimal value (higher) when compared with the hardness in 3 layers and 4 layers. In the 5-layer specimen, the resulting hardness value was 482.13 kgf/mm2, for the 4-layer specimen, the average value was 464.83 kgf/mm2, and in the 3-layer specimen, the hardness value was 444.13 kgf/mm2. For toughness testing, the highest toughness value was obtained, namely 1.32 (J/mm2) for the 3 layers specimen, compared to 4 layers with a toughness value of 1.25 (J/mm2) and 5 layer with a toughness value of 1.19 (J/mm2). The toughness value decreases as the hardness value increases.
Analysis of Bending Methods on BjTP 280 Roundbars on Hardness and Microstructure Muttaqin, Adzin Hanif; Munir, Mohammad Miftachul; Rohmat, Imam Khoirul
Journal of Welding Technology Vol 5, No 2 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v5i2.4197

Abstract

Reinforcing steel or commonly called roundbars is a material that is often used in industry, this is because the material is strong and easy to find anywhere. Deformation has a relationship to hardness. The higher the deformation value, the higher the material hardness value, but this is inversely proportional to the grain change, where the greater the deformation, the smaller the grain size. This research aims to determine the hardness and microstructure values of cold bending and hot bending treatments. Research by carrying out cold bending and hot bending which is connected to roundbars material without BjTP 280 bending treatment with the SMAW welding process. The highest hardness value is shown in the HAZ area of the hot bending specimen with a hardness value of 239.97 HV with a fine and small microstructure so it has the highest hardness value.
Co-Authors Adri Fato Ahmad Erlan Afiuddin Alfriansyah Aditya Anggara, Dika Aulia Nadia Rachmat Bachtiar Bachtiar Bachtiar Bahtiar, Yudha Budi, Hendri Budi Kurniyanto Dika Anggara Fathani Adhitya Mamang Fitri Hardiyanti Hendri Budi Kurniyanto Kurniyanto, Hendri Budi Kusminah, Imah Luluk M. Habib Muzzakki Marzuki Marzuki Mey Rohma Dhani Moch Iqbal Ramadhan Mochamad Yusuf Santoso Mochammad Karim Al Amin Moh. Miftachul Munir Moh. Syaiful Amri Mohammad Miftachul Munir Mohammad Munir Muh Sulhan, Ilham Ainur Rosyid Muhamad Ari Muhammad Saka Hafshah Mukhlis Mukhlis Mukhlis Munir, Mohammad Miftachul Mustain, Eko Muttaqin, Adzin Hanif Nisazarifa, Adristi Pradana, Dika Septya Pratama, Bintang Rizha Agustian Dwi Susanto Ruddianto Sasongko, Kukilo Edy Wibowo, Alvalo Toto Widodo, Erick Wahyu Restu Winarto Winarto Winarto Winarto Yuansa Septianto Yudi Eko Suyono