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Journal : Otopro

PENGARUH JENIS ELEKTRODA TERHADAP SIFAT MEKANIK HASIL PENGELASAN SMAW MATERIAL BAJA ST 42 Armika, I Putu; Nugraha, I Nyoman Pasek; Widayana, Gede
Otopro Vol 20 No 2 Mei 2025
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v20n2.p56-61

Abstract

SMAW (Shield Metal Arc Welding) is an activity carried out in the joining process which has a metal base material. The purpose of the study was to analyze the tensile strength results, and to determine the microstructure of the strongest electrode. using three types of electrodes RB-26, RD-250 and LB-52U electrode diameter 2.6mm on ST37 steel plate with ASTM E8 specimens with a length of 200mm, a width of 20mm and a thickness of 3mm. SMAW welding process with a welding current of 95A, with a position of 1G (flat). This study uses a descriptive quantitative statistical data processing method of experiments using Microsoft Excel software. From the results of the study there is a significant influence on the tensile strength of the three electrode variations. The highest tensile strength results are shown in the RD-260 electrode with a tensile strength of 513.28MPa and the lowest is the LB-260 electrode with a tensile strength of 478.09MPa. The results of microstructure testing with 200x and 400x measurements show that pearlite is the most abundant in the RB-26 electrode and ferrite is the most abundant in the RD-260 electrode. From the tensile test and microstructure test, there is a mutually influencing relationship that the highest tensile strength is the RD-260 electrode type, proven by the greater dominance of ferrite which is softer and more ductile. This finding indicates that the selection of electrode type plays an important role in determining the mechanical properties of the welding results.
ANALISIS KEKUATAN IMPACT KOMPOSIT POLYESTER BERPENGUAT SERBUK KAYU JATI DENGAN VARIASI FRAKSI VOLUME MATRIKS DAN REINFORCEMENT Ariantika, Kadek; Wiratmaja, I Gede; Nugraha, I Nyoman Pasek
Otopro Vol 19 No 2 Mei 2024
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v19n2.p50-54

Abstract

The biggest problem facing the automotive industry today is limited natural resources and environmental protection. Therefore, it is very important to conduct and carry out research and mapping of alternative materials that can reduce the use of non-renewable materials. The aim of this research is to determine the effect of variations in the volume of teak wood powder on the impact strength of composites with a polyester polymer matrix and identify fracture patterns. This research uses an experimental design combined with one-way statistical analysis of variance to test the research hypothesis. The results showed that there were significant differences in impact strength between the variations of the three specimens tested. Specimens with variations in volume fraction of 20%:80% for teak wood powder and polyester resin have the highest impact strength, while specimens with variations in volume fraction of 30%:70% for teak wood powder and polyester resin have the lowest impact strength. Apart from that, examination of the microscopic structure of the fracture patterns shows differences in fracture patterns between specimens. Specimens with variations in volume fraction of 0% (100% polyester resin) show a brittle fracture mechanism, while specimens of 10%:90%, 20%:80%, 30%:70% for teak wood powder and polyester resin show that the fracture pattern that appears is a combination of fragility and fibular fracture which is also called a fibrous fracture.
Co-Authors Abdi Pranata, I Gede Adisantosa, I Gede Wahyu Denata Agus Adi, I Nyoman Alfian, Handi Aprianto, Gede Aprilia, Dodik ari pradnyana, suta Ariantika, Kadek Arifudin, Andi Armika, I Putu Arnawa, I Komang Gede Arsana, Putu Baskara, Rizal Buddhi Satya Utama Budiastawan, Ngurah Putu Darma, Kadek Budi Susila Deva Supriana, Putu Dewa Gede Hendra Divayana, Dewa Gede Hendra Dewa, I Dewa Gede Darma Permana Dewangga, Sang Putu Fitrah Dewi, L.J.E. Dipa, Dewa Putu Dias Sancaya Dwipayana, Made Krisna Eka Jaya, I Gd Elisa, Edi Fajriyanto, Muhammad Noval Firdaus, Kholid Galang Kawih Gede Agus Widiantara Gede Widayana Gede Widayana Hadi Susanto Haryono, Dimastya Teguh Cipto I Gede Ari Saputra I Gede Made Aditya Tresnajaya I Gede Wiratmaja I Gusti Ngurah Sanjaya, I Gusti Ngurah I Putu Heri Yudistira Kadek Rihendra Dantes Kadir, Ach. Khalil Kayana, I Made Dwi Kayana, Made Dwi Kolo, Jaeme Martins Krisnayadi, Made Hari Luh Joni Erawati Dewi Made Agus Suardana Pinatih Mahayoga, I Kadek Alit Mohammad Zakarianto Nyoman Arya Wigraha Pradana, Putu Surya Pramesti, I Gede Yoga Prayuda, Gede Wisnu Priadi, Made Angga Putera, Ocky Primatara Putra Krisnanandha, Vidsvara Putra, A. A. Pt. Ananta Putra, Anak Agung Kade Semara Putra, I G Ngurah Kusuma Randi Wirdana, I Gede Riandika, Putu Ryan Pratama Putra, Ryan Pratama Satriadyanto, Irawan Suadnyana, Made Budi Suandika, I Komang Adi Suartama, I Putu Gede Subadra, I Nengah Suka Arimbawa, I Kadek Suryantara, Putu Agus Sutrisna, Kadek Wibawa, I Wayan Satya Widiarta, I Wayan Wijaya, Dedik Ananta Wijaya, Kadek Surya Yasa, Kadek Odi Supertama Zurweni Zurweni