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All Journal Automotive Experiences Teknologika
Rohman Rohman
Sekolah Tinggi Teknologi Wastukancana, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Optimization of Tensile-Shear Strength in the Dissimilar Joint of Zn-Coated Steel and Low Carbon Steel Sukarman Sukarman; Amri Abdulah; Jatira Jatira; Dede Ardi Rajab; Rohman Rohman; Choirul Anwar; Yulfian Aminanda; Muhammad Ali Akbar
Automotive Experiences Vol 3 No 3 (2020)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1145.093 KB) | DOI: 10.31603/ae.v3i3.4053

Abstract

The present study features analytical and experimental results of optimizing resistance spot welding performed using a pneumatic force system (PFS). The optimization was performed to join SECC-AF (JIS G 3313) galvanized steel material with SPCC-SD low carbon steel. The SECC-AF is an SPCC-SD (JIS G 3141) sheet plate coated with zinc (Zn) with a thickness of about 2.5 microns. The zinc coating on the metal surface causes its weldability to decrease. This study aims to obtain the highest tensile-shear strength test results from the combination of the specified resistance spot welding parameters. The research method used the Taguchi method using four variables and a combination of experimental levels. The experimental levels are 2-levels for the first parameter and 3-levels for other parameters. The Taguchi optimization experimental results achieved the highest tensile-shear strength at 5049.64 N. It properly worked at 22 squeeze time cycles, 25 kA of welding current, and 0.6-second welding time and 12 holding-time cycles. The S/N ratio analysis found that the welding current had the most significant effect, followed by welding time, squeeze time, and holding time. The delta S/N ratio values were 1.05, 0.67, 0.57 and 0.29, respectively.
PENGARUH PERUBAHAN DIAMETER PERMUKAAN GUN TIP PADA PROSES SPOT WELDING TERHADAP KUALITAS SIFAT MEKANIK NUGGET WELD DI PT. XYZ Rohman; Dede Abdi Rajab; Arif Rahman
Jurnal Teknologika Vol 10 No 2 (2020): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (822.909 KB) | DOI: 10.51132/teknologika.v10i2.87

Abstract

Proses spot welding merupakan teknik pengelasan yang banyak digunakan pada manufacture otomotive. Salah atu keutamaannya untuk menghasilkan kualitas produk yang terjamin dan rapih, adapun permasaahan yang diakibatkan dari proses spot welding ialah spot lose atau pengelasan yang tidak menempel.Untuk mengetahui permasalahan spot lose ada beberapa faktor yang berkaitan, diantaranya parameter spot welding, proses pengerjaan, diameter ujung gun tip, material part dan sirkulasi pendinginan. Pengujian dilakukan dengan memvariasikan jumlah pengelasan yang ke 1, 100, 200, 300, 400 dan 500 kali pengelasan. Material yang digunakan low steel JIS S 20C, parameter disesuaikan dengan standar pemakaian. Pengujian dilakukan untuk mengetahui sifat mekanik dari nugget weld diantaranya pengujian tarik dan pengujian kekerasan.Hasil penelitian menunjukkan bahwa variasi jumlah pengelasan berpengaruh pada diameter ujung gun tip, sehingga pembesaran pada ujung diameter gun tip mempengaruhi luas alas diameter nugget weld, pada pengelasan yang ke 1 menghasilkan UTS tegangan geser paling besar yaitu 27,30 kg/mm2 dan kekerasan pada daerah las sebesar 38 HRC, sedangkan pada pengelasan yang ke 500 menghasilkan penurunan UTS tegangan geser hingga 10,67 kg/mm2 dan kekerasan pada daerah las sebesar 39 HRC.
Co-Authors Amri Abdulah Arif Rahman Choirul Anwar Dede Abdi Rajab Dede Ardi Rajab Jatira Jatira Muhammad Ali Akbar Sukarman Sukarman Yulfian Aminanda