Abstract A36 and A53 steels are low carbon steel with relatively similar percentage, respectively 0,25-0,30% 0,25-0,29%. Both often used within the marine industry. The objective of this research is to figure out effect variation groove angle heat input process welding two different plates towards a metallography, tensile, bending test E71T electrode, as well figuring weld 18 mm thick plates. 5...