| 摘要 |
PURPOSE:To execute the welding work with high efficiency, and to prevent the deterioration of toughness of a welding zone and a welding metal and the generation of a microcracking. CONSTITUTION:At the time of welding a steel base material, the cooling time DELTAT800-500 is shortened by injecting a low temperature refrigerant of liquefied gas of liquid nitrogen, liquid argon, etc., to a high temperature bead part in the vicinity of a molten pool and cooling forcibly and quickly the bean part by following a movement of a welding position. |
