Comparison of Bending and Impact Property Related to Flux Cored Arc Welding and Submerged Arc Welding of LT-FH with Respect to Welding Parts of Liquefied Petroleum Gas Tank

LT-FH, a low temperature C-Mn steel, was utilized to compare the bending and impact properties of various specimens based on welding method.The property-comparison out of welding method was accompanied by performing bending and impact tests under the standards of the "Classification Society" for manufactured structures for LPG tank applications.In order to acquire the property-comparison on the given test specimens, flux cored arc welding (FCAW) and submerged arc welding (SAW) were utilized to weld the given test pieces.The specimens used for the bending and impact tests were prepared by precise fabrication using both lathe and milling machines.First of all, no cracks were observed on the root part of the bent specimen when the bending test was performed.In addition, when evaluating the effects of impact property related to the weld metal and heat affected zone, the SAW results differed little compared to FCAW.Actually, with respect to SAW, the weld metal showed twice as high impact toughness as the heat affected zone.The results of the impact test confirmed that ductile fracture occurred via microstructural mechanism including lots of dimple microstructures, which means that immediate plastic deformation was produced during the Charpy impact test.