PENGARUH JENIS ACTIVATED FLUX DAN VARIASI KUAT ARUS PADA PENGELASAN A-TIG DISSIMILAR MATERIAL TERHADAP KEDALAMAN PENETRASI, KEKERASAN, STRUKTUR MIKRO DAN LAJU KOROSI

Abstract

The TIG welding process has shallow penetration. The addition of activated flux can increase the depth of penetration of the weld, which is called A-TIG welding, so this study to analyze the effect of the activated flux type and current on the depth of penetration, hardness, microstructure, and corrosion rate. This study used SUS 304 and A36 materials with a thickness of 6 mm which are welded using the A-TIG welding process with variations of activated flux Fe₂O₃, Cr₂O₃ and variations in the current strength of 100 amperes and 120 amperes. To find out the results of these variations, this study was tested by macro, hardness, microstructure, and corrosion rate tests. The results of the study on variations in the type of activated flux and variations in current resulted penetration depth of 3.6 mm found in activated flux Cr₂O₃ with 120 amperes and penetration depth in activated flux Fe₂O₃ with a value of 2.43 mm on 100 amperes. Then the highest hardness value was found in activated flux Fe₂O₃ and 120 amperes with a value of 471.48 HVN, and the lowest is in Cr₂O₃ ampere 100 with a value of 398.16.HVN. The micro test results in a phase change from pearlite, ferrite, and austenite to martensite in the weld metal. And to test the corrosion rate on activated flux Fe₂O₃ and a current of 120 amperes with a value of 0.24931 mm/year, the activated flux Cr₂O₃ and a current of 100 amperes with a value of 0.090114 mm/year.