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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Journal of Welding Technology
Ferdiyansyah Ferdiyansyah
PT. Pupuk Iskandar Muda
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Holding Time on Stress Relief Annealing Process to Hardness of Carbon Steel SA.106 Grade B After Welding Syukran Syukran; Azwinur Azwinur; Ferdiyansyah Ferdiyansyah
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 14, No 1 (2020): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.14.1.46-51

Abstract

Stress relief annealing (SRA) is a process of releasing residual stresses contained in the material due to the welding process. The need for SRA is due to heterogeneous changes in the microstructure when the material is exposed to the heat of welding so that it will cause the mechanical properties of the material to change. One of the mechanical properties that experience significant changes is hardness (hardness value) because it can experience an increase. Therefore it is necessary to decrease the hardness value through a heat treatment SRA that takes into account the appropriate holding time. The purpose of this study was to determine the effect of holding time variations on the value of the welding material hardness for the carbon steel case SA.106 Gr.B. During this time after welding SA106 material specifically under 19 mm thickness is not heat treatment after welding even though the welding effect will change the properties of this material, so it is necessary to heat treatment with certain holding time variations to determine its effect on the mechanical properties of the material. The welding process uses SMAW with E7018 electrodes. Specimen heating is carried out in a heating oven to a constant temperature of 650oC with variations in the heating time of 15 minutes, 30 minutes, and 45 minutes. Furthermore, hardness testing is done by testing the base metal area, heat affect zone, and weldment. The results that SRA greatly influenced the hardness value of a welded material, based on testing the highest hardness value in the SRA heat treatment was obtained at a holding time of 45 minutes with a hardness value on the base metal of 67 HRC (BM), HAZ area of 65.25 HRC, and weldment area of 64.42 HRC. But at the holding time for 45 minutes, the value of material hardness tends to be more uniform compared to other variables.
Pengaruh arus pengelasan SMAW terhadap kekuatan sambungan las double lap joint pada material AISI 1050 Azwinur Azwinur; Adi Saputra Ismy; Rizky Nanda; Ferdiyansyah Ferdiyansyah
Journal of Welding Technology Vol 2, No 1 (2020): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v2i1.1833

Abstract

Pengelasan merupakan ikatan metalurgi pada sambungan logam atau logam paduan yang dilakukan dalam keadaan lumer atau cair. Mengelas adalah suatu aktifitas menyambung dua bagian logam atau lebih dengan cara memanaskan atau menekan atau gabungan dari keduanya sedemikian rupa sehingga menyatu seperti benda utuh. Kekuatan sambungan pengelasan merupakan syarat dari sebuah konstruksi terutama di industri migas seperti pada instalasi perpipaan dan tanki bertekanan. Prosedur mengelas dan parameternya merupakan suatu hal yang sangat mempengaruhi kekuatan dari sambungan las. Penelitian ini bertujuan untuk mengetahui kekuatan sambungan lap joint terhadap hasil pengelasan SMAW pada baja AISI 1050 dengan elektroda 7016.Variasi arus yang digunakan dalam proses pengelasan ini yaitu 100A, 125A dan 150A. Hasil penelitian menunjukkan bahwa arus pengelasan sangat mempengaruhi kekuatan sambungan las, hal ini dapat terlihat dari nilai kekuatan tegangan tarik dimana nilai tertinggi pada spesimen yang dilas dengan arus 100A sebesar 74.05 kgf/mm2, sedangkan untuk tegangan tarik terendah pada spesimen dengan arus pengelasan 150A dengan nilai tegangan tariknya sebesar 68.60 kgf/mm2. Hasil bentuk patahan setelah proses pengujian tensile test tidak terjadi pada daerah weld metal dan bentuk patahan yang terjadi dapat dikategorikan dalam bentuk patahan getas. AbstractWelding is a metallurgical bond in a metal or alloy metal connection which is done in a liquid state. Welding is an activity of joint two or more metal parts by heating or pressing or a combination of the two in such a way that they merge like whole objects. The strength of the welding joint is a prerequisite for a construction especially in the oil and gas industry such as in piping installations and pressurized tanks. The welding procedure and its parameters is a matter that greatly affects the strength of the welded joint. This study aims to determine the strength of the double lap joint to the SMAW welding results on AISI 1050 steel with 7016 electrodes. Current variations used in this welding process are 100A, 125A and 150A. The results showed that the welding current greatly affected the strength of the weld joint, this can be seen from the value of the tensile stress strength where the highest value in the specimens welded with a current of 100A was 74.05 kgf / mm2, while for the lowest tensile stress on the specimen with a welding current of 150A with a value of tensile stress of 68.60 kgf / mm2. The results of the fracture form after the tensile test does not occur in the weld metal area and the shape of the fracture that occurs can be categorized in the form of brittle fracture. 
Co-Authors Adi Saputra Ismy Azwinur Azwinur Rizky Nanda Syukran Syukran