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All Journal Journal of Renewable Energy and Mechanics Jurnal Teknologi dan Manajemen Industri Terapan
Mukhlis
Politeknik Perkapalan Negeri Surabaya
Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Mechanical Properties of Repair Welding High Yield Strength Structural Steel S690Q: SIFAT MEKANIK SAMBUNGAN LAS HASIL REPAIR BAJA STRUKTUR HIGH YIELD STRENGTH S690Q Hendri Budi Kurniyanto; Diki Hadi Pratama; Imam Khoirul; M. Thoriq Wahyudi; Mukhlis
Journal of Renewable Energy and Mechanics Vol. 5 No. 01 (2022): REM VOL 5 NO 01 2022
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.295 KB) | DOI: 10.25299/rem.2022.8782

Abstract

Repeated welding caused by welding defects in the weld joint will result in changes in the mechanical properties of the weld joint, especially in the Heat Affected Zone (HAZ). Significant changes will occur when welding on steel materials that have undergone special treatment during the manufacturing process, such as quenched and tempered S690Q steel. S690Q steel is a structural steel with high yield strength with quenched and tempered conditions. The research was conducted by doing repeated welding as a simulation of the repair process using the GMAW process. Macro observations as well as tensile, bending, hardness, toughness tests were carried out on cross sections of welded joints. From the results of all the tests carried out the results meet the requirements of the BS EN ISO 15614-1 standard, but the results of the hardness test can identify significant changes in mechanical properties in the HAZ, especially in the bottom or root pass and hot pass areas. The average hardness value decreased from 334.07 HV at the top (face) to 209.55 HV and 198.88 HV at the bottom (hot pass and root pass) on the left side of the HAZ. While on the right side of the HAZ, the hardness value is 337.40 HV to 254.34 HV and 208.64 HV. Keywords: HAZ, S690Q, Structural Steel, Quenched and Tempered Steel
Analisis Nilai Kekerasan, Nilai Ketangguhan dan Struktur Mikro pada Multiple Repair dan Post Weld Heat Treatment (PWHT) Pengelasan HARDOX 500 Rocky Andiana; Mukhlis; Daffa Ramadhan Arya Wiratama; Zindhu Maulana Ahmad Putra
Jurnal Teknologi dan Manajemen Industri Terapan Vol. 4 No. 3 (2025): Jurnal Teknologi dan Manajemen Industri Terapan
Publisher : Yayasan Inovasi Kemajuan Intelektual

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55826/xzgr4c53

Abstract

Perbaikan berulang (multiple repair) pada baja HARDOX 500 menggunakan las berisiko menurunkan sifat mekanisnya. Penelitian menganalisis dampak dari jumlah repair dan durasi Post-Weld Heat Treatment (PWHT) terhadap sifat mekanis dan mikrostruktur. Metode penelitian adalah eksperimental dengan pengelasan Shielded Metal Arc Welding (SMAW) pada baja HARDOX 500. Variabel meliputi jumlah repair (tanpa repair, 1x, dan 2x) serta durasi holding time PWHT (30 dan 60 menit). Analisis dilakukan melalui uji kekerasan Vickers, uji impak Charpy, dan pengamatan struktur mikro. Hasil penelitian menunjukkan penambahan jumlah repair dapat meningkatkan nilai kekerasan namun menurunkan nilai ketangguhan material. Fenomena ini diatribusikan pada peningkatan masukan panas kumulatif dan formasi fasa bainit. Sebaliknya, proses PWHT dengan durasi holding time yang lebih lama (60 menit) terbukti efektif menurunkan nilai kekerasan, yang konsisten dengan terjadinya pertumbuhan butir dan pembentukan fasa ferit asikular yang lebih lunak. PWHT disimpulkan dapat memulihkan sebagian ketangguhan yang hilang akibat proses repair.
Co-Authors Daffa Ramadhan Arya Wiratama Diki Hadi Pratama Hendri Budi Kurniyanto Imam Khoirul M. Thoriq Wahyudi Rocky Andiana Zindhu Maulana Ahmad Putra