ANALISIS PENGARUH ARUS PADA PENGELASAN BERTINGKAT (MULTILAYER WELDING) TERHADAP STRUKTUR MIKRO, KEKERASAN DAN KUAT TARIK SAMBUNGAN MATERIAL ASTM A106

This aims of this study to determine the effect multilayer welding on ASTM A106 type carbon steel pipe material characteristics microstructure, hardness and maximum tensile strength material. is used as a raw for using Shielded Metal Arc Welding (SMAW) method. joints carried out in three layers (multilayer welding), namely root pass, hot capping layers. There are two variations specimens study, specimen 1 currents were 60, 70 80 A while 2 70, 90 A. To current each include Vickers Testing, microstructure testing testing. The results show that base metal area dominated by ferrite phase, which indicates has low weld shows more perlite phase than besides grain size smaller denser; level will increase when compared metal. test all concluded highest value was weld. From test, it can be greater 2.5% 1.