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Dika Anggara
Politeknik Perkapalan Negeri Surabaya
Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Comparative analysis of hardness and microstructure of dissimilar welded materials at various welding positions in the fabrication industry Mochammad Karim Al Amin; Ilham Nurcholis; Wiwik Dwi Pratiwi; Dika Anggara; Eriek Wahyu R W
Journal of Welding Technology Vol 4, No 1 (2022): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v4i1.2967

Abstract

304 stainless steel is commonly used in industry due to the advantages of great conductivity, while SS 400 carbon steel is largely used in the various engineering field on purpose of industrial and fabrication. One of examples is penstock application in Tegal, Central Java, has been using more than one kind of dissimilar steel, SUS 304 and SS 400, and the various of welding position (1G, 2G, and 3G). Penstock was flowed water from the river for irrigation and raw water so that could be affected to decrease of the thickness of materials. This research was conducted on the dissimilar welding of SUS 304 and SS 400 by SMAW with the welding process of (1G), (2G), and (3). After the welding process, visual examination, hardness test, and microstructure were conducted to examine the quality of welded and hardness of the root and surface of weld. The visual test was shown that no defect, the highest of hardness was at the weld metal with 3G of welding position at 207.17 HVN (specimen 2B) while the lowest of hardness was 195.13 HVN with 2G position (specimen 2A). The microstructure of weld metal was austenite of white and delta-ferrite of black, delta-ferrite was vermicular.
Analisis variasi arus pengelasan Submerged Arc Welding pada proses build-up beam material SM490YA terhadap perubahan distorsi menggunakan metode eksperimen dan numerik Rega Kurniawan; Muhamad Ari; Dika Anggara
Journal of Welding Technology Vol 3, No 2 (2021): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v3i2.2507

Abstract

Proses Pengelasan SAW (Submerged Arc Welding) dengan arus besar secara kontinyu mengakibatkan panas yang masuk juga secara kontinyu pada satu titik. Hal ini mengakibatkan ekspansi yang signifikan jika terkena panas dan penyusutan jika mengalami pendinginan dan distorsi pada material. Pada penelitian ini, eksperimen dilakukan dengan variasi arus las. Pemodelan numerik struktural – termal dilakukan dengan software berbasis elemen hingga, dengan menggunakan data dari eksperimen sebagai validasi. Distrosi yang terjadi pada eksperimen dan pemodelan mendapatkan hasil yang mendekati. Distorsi sudut yang paling minimum pada eksperimen pengelasan SAW Single 450A sebesar 1,0˚ dan 1,2˚, sedangkan pada pemodelan numerik sebesar 1,15 ˚.
Co-Authors Eriek Wahyu R W Ilham Nurcholis Mochammad Karim Al Amin Muhamad Ari Rega Kurniawan Wiwik Dwi Pratiwi