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Effects of Welding Current and Material Thickness on Hardness and Tensile Strength of SPCC Steel Welded Using the Metal Inert Gas (MIG) Process Sutrisno Sutrisno; Yohanes Maria Astomo Dwi S; Aditya Nugraha; Adhi Setya Hutama; Rudi Kristianto; Yohanes Oscar Andrian
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7211

Abstract

This study investigates the effect of welding current and material thickness on the hardness and tensile strength of cold-rolled SPCC steel welded using the Metal Inert Gas (MIG) process. Welding current was varied at 80 A, 90 A, and 100 A, while material thicknesses of 0.9 mm, 1.4 mm, and 2.0 mm were used. Specimens were prepared according to the ASTM E8 standard for tensile testing. Hardness measurements were conducted in the heat-affected zone (HAZ) and base metal using the Leeb hardness method, while tensile properties were evaluated through tensile testing. The results show that welding current and material thickness significantly affect the mechanical properties of the welded joints. The highest hardness value of 672 HLD was obtained at a welding current of 100 A with a plate thickness of 0.9 mm, whereas the lowest hardness value of 232 HLD occurred at 80 A with a thickness of 2.0 mm. The highest average tensile strength of 340.56 N/mm² was achieved at 90 A with a thickness of 1.4 mm. The results indicate that a moderate welding current provides optimal tensile performance, whereas higher current levels increase hardness due to greater heat input during the welding process. Therefore, appropriate parameter selection is essential to achieve optimal welding performance in thin SPCC steel plates.  
Rancang Bangun Mesin CNC Painting Berbasis Mach 3 Rudi Kristianto; Y AstomoD.S; Chatarina Adjeng Aprilliasari; Benedictus Bimo Kurniawan; Dionicius Wijang Fenandy Esa; Muhammad Rosyid Wijaya; Reza Andhika Sudiyoko
Journal of Applied Mechanical Engineering and Renewable Energy Vol 6 No 1 (2026)
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/1gx6wt69

Abstract

Penelitian ini membahas proses perancangan dan pembangunan mesin CNC Painting berbasis Mach3 yang ditujukan untuk membantu proses pengecatan secara otomatis dengan hasil yang terkontrol dan seragam. Latar belakang dari proyek ini adalah kebutuhan akan sistem pengecatan yang dapat menggantikan metode manual, mengurangi ketergantungan pada operator, serta menghasilkan kualitas pengecatan yang konsisten. Metode yang digunakan meliputi perancangan struktur mekanik pada sumbu X, Y, dan Z, pemasangan sistem pneumatik yang difungsikan sebagai penarik pelatuk spray gun dalam proses pengecatan, serta integrasi sistem kontrol berbasis perangkat lunak Mach3 untuk mengatur pergerakan motor stepper sesuai jalur gerak yang telah diprogram. Pengujian dilakukan terhadap seluruh bagian sistem, termasuk pengujian mekanik pergerakan tiap sumbu dan pengujian fungsi sistem spray. Hasil pengujian menunjukkan bahwa mesin mampu bergerak pada setiap sumbu dan menjalankan proses pengecatan. Mekanisme penarikan pelatuk melalui pneumatik bekerja secara responsif sesuai perintah program, sehingga proses pengecatan dapat berlangsung otomatis. Kesimpulannya, mesin CNC Painting yang dirancang dalam proyek ini berhasil menjalankan fungsi pengecatan otomatis sesuai dengan rancangan, dan berpotensi untuk diterapkan dalam kebutuhan pengecatan berulang dengan hasil yang konsisten.
Co-Authors Adhi Setya Hutama Aditya Nugraha Benedictus Bimo Kurniawan Chatarina Adjeng Aprilliasari Dionicius Wijang Fenandy Esa Muhammad Rosyid Wijaya Reza Andhika Sudiyoko Sutrisno Sutrisno Y AstomoD.S Yohanes Maria Astomo Dwi S Yohanes Oscar Andrian