| 摘要 |
PURPOSE:To cool high temperature heated parts, form a protecting atmosphere near the weld zone and enable good welding to be accomplished with high efficiency by supplying liquefied inert gas to the electric weld zone and its surroundings. CONSTITUTION:The supply of liquefied inert gas in the form of liquid offers the prevention of burn-through and oxidation of the high temperature parts after welding, besides the assurance of the oxidation prevention of the weld zone. Further, in arc welding, it offers throttled arc and concentrated heat energy and in high frequency welding it does easier current supplying. For example, high frequency current is supplied by way of the contact chips 3 of both edges 2 of a formed hoop 1 moving in the arrow direction. Liquefied gas such as Ar the or like is evenly supplied along the weld line from the metal pipes 6, 7 having the plural supply holes 10, 11 above and below the weld zone 5. The vaporized gas on the way exhausts through the pipe 13 of a separator 12. A plate member 14 is provided in the lower part to let the liquefied gas stangate. The escape of the inert gas and the entry of the air are prevented by a disc 15 such as of felt or the like. |
