Abstract
About the thesis, we did the welding construction experiment by using two kinds of examination bodies with different shape of the real scale and the butt joint. In addition, we examined the influence that the difference of the material shape gave to strength of the weld metal by using three dimensions finite element method analysis. Consequently, the following findings were obtained. It could be possible to presume the strength of weld metal from heat input, interpass temperature, mill sheet value of welding wire, and material shape. The cooling time of the weld metal is influenced form the heat input, interpass temperature and the volume of the material, and we can presume the cooling time from these results. Carbon equivalent of the weld metal receives the influence by the heat input, and we can presume carbon equivalent of the weld metal from chemical component of welding wire and the heat input.
