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All Journal Jurnal Pendidikan Teknik Mesin
Yasmin, Dzikrina Salsabila
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Mechanical Engineering

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EFFECT OF WELDING CURRENT ON LOW CARBON STEEL CHARACTERISTICS IN SMAW CLADDING PROCESS paundra, fajar; Yasmin, Dzikrina Salsabila; Pujiyulianto, Eko; Muhyi, Abdul; Rajagukguk, Kardo; Prabowo, Imam
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 1 (2025): June 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i1.21279

Abstract

The electric current magnitude is a fundamental parameter that directly affects penetration characteristics and weld bead geometry. This study analyzes the effect of current variations on physical and mechanical properties in the cladding process using the Shielded Metal Arc Welding (SMAW) method. The materials used are low-carbon steel and HV-600 electrodes with a diameter of 3.2 mm. The SMAW method was applied with current variations of 100 A, 120 A, 140 A, and 160 A. The tests carried out were NDT liquid penetrant, macro structure, micro structure and Vickers hardness. The results indicate a positive correlation between increasing current and hardness values in the weld area, with the highest hardness recorded at 665.803 HVN at 160 A and the lowest at 515.143 HVN at 100 A. Meanwhile, in the Heat Affected Zone (HAZ), a non-linear pattern was observed, with a maximum hardness of 263.237 HVN at 120 A and a minimum of 219.110 HVN at 140 A. Microstructural analysis revealed the formation of ferrite, pearlite, bainite, and martensite phases in the weld area, providing insights into optimizing welding parameters to enhance the mechanical properties of low-carbon steel cladding.
ANALYSIS OF MECHANICAL CHARACTERISTICS OF TOOTH BUCKET EXCAVATOR BASED ON DIFFERENT GRADE LEVELS nurdin, akhmad; Zulfikar Alief Utama, Iqbal; Angger Prasetiyo, Bagus; Hidayat, Rosyidi; Paundra, Fajar; Kurniawan, Fajri; Yasmin, Dzikrina Salsabila; Muhyi, Abdul
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025 (on going)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.33074

Abstract

The purpose of this study is to comprehend the microstructure and hardness value of three distinct tooth bucket manufacturers. Three manufacturers' excavator tooth buckets—Canada Grade, China Grade A, and China Grade C—are compared for their mechanical characteristics. Among the tests are the Vickers method for measuring hardness, optical microscopy for examining microstructure, and chemical composition analysis. According to the results, the primary elements in all three specimens—carbon, silicon, manganese, and chromium—meet the DIN Grade 25CrMo4 standard. The martensite phase, which gives the Canada product its hardness and resistance to deformation, dominates its microstructure. The China Grade C product, on the other hand, has a more prominent ferrite phase, which raises ductility while decreasing hardness. China Grade C (570.24 HVN) had the highest hardness test value, followed by China Grade A (517.67 HVN) and Canada (468.09 HVN). This demonstrates that while Canada excels at withstanding heavy loads without damage, China Grade C is better suited for applications needing high wear resistance. Users of heavy machinery can use this study as a scientific guide when choosing bucket nails based on operational requirements, including material toughness and wear.
Co-Authors Angger Prasetiyo, Bagus Fajri Kurniawan Hidayat, Rosyidi Imam Prabowo, Imam Kardo Rajagukguk, Kardo Muhyi, Abdul Nurdin, Akhmad Paundra, Fajar Pujiyulianto, Eko Zulfikar Alief Utama, Iqbal