Yustiasih Purwaningrum
Program Studi Teknik Mesin FTI Universitas Islam Indonesia

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PENGARUH ARUS LISTRIK TERHADAP KARAKTERISTIK FISIK-MEKANIK SAMBUNGAN LAS TITIK LOGAM DISSIMILAR AL-STEEL Purwaningrum, Yustiasih; Fatchan, M.
ROTASI "JURNAL TEKNIK MESIN" VOLUME 15, NOMOR 1, JANUARI 2013
Publisher : ROTASI "JURNAL TEKNIK MESIN"

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Abstract

The resistance spot weld of dissimilar materials is generally more complex than that of similar materials due differences in the mechanical, physical and chemical properties of the base metals. This research aimed is to investigate the mechanical and physical properties of spot weld of dissimilar materials with various welding current. A Series of bead plate welds were made on 4 mm thick Al 5083 and 1,2 thick SS 400. The welding current that used were 65, 70 and 75 Amperes. The physical properties were examined based on the microstructure using Optical Microscope. The mechanical properties were measured with respect to the strength and hardness using Universal Testing Machine and Vickers Microhardness respectively. The microstructures of all resistance spot welded for carbon steel SS 400 with various welding current were bainit for weld metal and ferrite and pearlite for base metal and HAZ. Weld metal with current welding 75 A have the highest tensile-shear strength.
PENGEMBANGAN METODE STRESSED SHEETING WELD PADA PENGELASAN PLAT BERPENGUAT DENGAN VARIASI TEMPERATUR PREHEAT Purwaningrum, Yustiasih; Triyono, Triyono; Koharto, Kelvin; Suhartanto, Adit
Jurnal Teknoin Vol 20, No 1 (2014)
Publisher : Jurnal Teknoin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v20i1.6696

Abstract

This research investigates  stressed sheeting welded (SSW) effects of stiffened thin plate structure with preheat temperature  variations. Stiffened thin plate structure is a structure that  consists of frame and sheet that used on  vehicle structure because of requirement low volume materials. The principle of  SSW is installation of sheeting on the frame is done by pulling the sheeting in hot conditions so the sheeting after joined with the frame has the flat surface. Lap joints of  SS 400 with thickness of  1 mm dan 3 mm were made using Gas Metal Arc Welding. The preheat temperature that used were 50°C, 60°C and 70°C. The mechanical properties were measured with respect to strength and hardness while physical properties were examined based on the distortion, micro and macrostructure. Results show that the distortion of weld metal with preheat temperatures 50°C, 60°C and 70°C are 1.02; 2.06; and 2.22 mm respectively. This values is better than weld metal without  SSW that has distortion 3.02 mm. The tensile  strength of weld metals with SSW method  is 20% higher than the weld metal  without SSW. Ferrite and pearlite structure appeared in based metal and HAZ region while weld metal had acicular ferrite and grain boundary ferrite structure.
PERANCANGAN DAN PEMBUATAN MESIN LAS ELEKTRODA GANDA UNTUK MENINGKATKAN KUALITAS HASIL LAS Purwaningrum, Yustiasih; Kusriyanto, Medilla; Kurniawan, Rudi
Jurnal Teknoin Vol 24, No 1 (2018)
Publisher : Fakultas Teknologi Industri Universitas Islam Indonesia

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Abstract

Double Metal Arc Welding Gas Electrodes (DE-GMAW) is a new welding process that separates the melting current into a base metal current and a controlled current by adding a TIG torch to a conventional GMAW system to form an alternative path that will flow through the current. This makes it possible to reduce the current passing through the base metal, so that the heat input in the base metal can be controlled at the desired level. Research has been done to know the parameters for the welding process run stable between welding wire and torch TIG as current cutter. Parameters that affect the stability of the control system are Bypass Electrodes, Tungsten Distance to Welding Electrodes, Tungsten Distance to Workpieces, Torch GMAW Tube Distance to Workpieces, Angles between Tungsten and Welding Wires. To control the base metal current at the desired level, a group of power resistors is added in the control system. In this study, the welding is done using 18 V voltage by using several variations of the number of resistors. From the research shows that the control system developed can adjust the current cut in a large range to maintain the base metal current at the desired level. The welding results using the DE-GMAW control system show the physical properties of the weld result better when compared with welding without using current control system.