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All Journal Malikussaleh Journal of Mechanical Science Technology Jurnal Hurriah: Jurnal Evaluasi Pendidikan dan Penelitian
Muhammad Nuzan Rizki
Mechanical Engineering Department, Universitas Malikussaleh
Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of the Effect of Cutting Depth in the Thread-Making Process on Fatigue Testing Using a CNC Gedee Weiler Learn Turn Mhd Bagas Alfian Rizky; Aljufri Aljufri; Suryadi; Muhammad Nuzan Rizki; Ferri Safriwardy; Rahmatsyah Maksum Ramsi
Malikussaleh Journal of Mechanical Science and Technology Vol. 10 No. 1 (2026): Malikussaleh Journal of Mechanical Science and Technology (MJMST)
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v10i1.28687

Abstract

A thread is an essential element of a bolt that functions as both a fastener and a force-transmitting component, and therefore must be able to withstand both static and dynamic loads. In practical applications, threads are frequently subjected to repeated loading, which can potentially lead to failure due to material fatigue. This study aims to analyze the effect of thread depth variation on the fatigue resistance of AISI 1045 steel processed using a CNC Gedee Weiler Learn Turn machine. The thread depth variations used were 0.4 mm, 0.6 mm, and 0.8 mm. The testing method was carried out using a rotary bending fatigue machine until the specimen fractured, after which the number of cycles to failure and the resulting bending stress were calculated. The test results show that the greater the thread depth, the higher the bending stress experienced by the specimen, namely 227.7 MPa at a depth of 0.4 mm, 253.8 MPa at a depth of 0.6 mm, and 284.3 MPa at a depth of 0.8 mm. However, an increase in thread depth resulted in a decrease in the number of cycles to failure. The specimen with a 0.4 mm thread depth exhibited the most optimal and highest fatigue life value, at 5,127.54 cycles, whereas the specimen with a 0.8 mm thread depth achieved the most optimal fatigue life of only 2,603.04 cycles. These findings indicate that a shallower thread depth provides better fatigue resistance in AISI 1045 steel.
Analysis of the Mechanical Properties of SMAW Welded Joints on ST 37 Plate Material after PWHT as a Case Study in Welding Engineering Education Asadda Qulfaj; Aljufri A; Muhammad Nuzan Rizki; Nurul Islami; Muhammad Isra
JURNAL HURRIAH: Jurnal Evaluasi Pendidikan dan Penelitian Vol. 6 No. 2 (2025): Jurnal Hurriah: Journal of Educational Evaluation and Research
Publisher : Yayasan Pendidikan dan Kemanusiaan Hurriah Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56806/jh.v6i2.260

Abstract

One of the techniques in improving the mechanical properties of a welding result is the Post Weld Heat Treatment (PWHT) process. Attempts to improve these properties are the main goal of users so that the construction they build can last a long time from the influence of natural phenomena. This research aims to analyze the mechanical properties of SMAW welded joints on ST37 plate material that undergoes the PWHT process, as well as contribute as a practicum teaching material or case study in learning welding techniques in the technical education environment. In this study, welding was carried out with E7016 electrodes, and then three variations of the PWHT process were carried out, namely at temperatures of 400, 500, and 600°C with a holding time of 30, 60, and 90 minutes, respectively. The joints were tested using a penetrant test and a hardness test. The results showed that PWHT at 600°C with a holding time of 90 minutes produced the highest average hardness value compared to 400°C and 500°C with 30 and 60 minutes. This finding reinforces the understanding that temperature and holding time in the PWHT process significantly affect the hardness value of the weld. Therefore, the results of this study are not only useful in the development of manufacturing technology but also utilized as an applicable learning medium. By knowing the effect of PWHT on the mechanical properties of welded joints, welding instructors can design a more effective practicum in teaching the principles of welding.
Co-Authors Aljufri A Aljufri Aljufri Asadda Qulfaj Ferri Safriwardy Mhd Bagas Alfian Rizky Muhammad Isra Nurul Islami Rahmatsyah Maksum Ramsi Suryadi Suryadi