The Study on Metallurgical Structure and Corrosion Resistance of Dissimilar Welds between ASTM A790 SAF 2205 and ASTM A312 TP 316L Stainless Steel Pipe by Gas Tungsten Arc Welding Process
Keywords:Corrosion Resistance, Stainless Steel, ASTM A790 SAF 2205, ASTM A312 TP 316L
This research studies dissimilar welding between ASTM A790 SAF 2205 and ASTM A312 TP 316L stainless steel pipe by using gas tungsten arc welding (GTAW) process which affects the metallurgical structure and corrosion resistance of weldment. The filler metal used in this experiment is AWS A5.9 ER2209 for joining the ASTM A790 SAF 2205 together and AWS A5.14 ERNiCrMo-3 for joining the dissimilar material between ASTM A790 SAF 2205 and ASTM A312 TP 316L. The metallurgical structure was examined by using an optical microscope (OM) and the corrosion resistance of welded joint was carried out with potentiodynamic polarization and immersion test method. From the result, it was found that the general microstructure of ASTM A790 SAF 2205 comprises ferrite and austenite, ASTM A312 TP 316L is austenite. AWS A5.9 ER2209 and AWS A5.14 ERNiCrMo-3 welded metal found ferrite-austenite and austenite respectively. Moreover, both corrosion resistance test methods reflect the highest corrosion rate that occurs on the dissimilar welded joint between ASTM A790 SAF 2205 and ASTM A312 TP 316L which was welded by AWS A5.14 ERNiCrMo-3 filler metal.
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