| 摘要 |
PURPOSE:To control penetration constant and perform stable welding by changing welding condition such as welding current etc., quantity of flux spreading, quantity of gas sent into the hollow so as to maintain internal pressure of arc part hollow in the flux accumulation. CONSTITUTION:Flux 5 is accumulated on a base metal 1 and a welding wire 2 is thrusted into it. Welding is performed by applying power from a welding power source 6 to the base metal and welding electrode 3. A heat resistant nozzle 8 made of a hollow pipe is thrusted into the arc hollow 7 in the flux accumulation generated right under the electrode 3. Pressure in the hollow 7 is detected continuously by a pressure detector 9 through the nozzle 8. The detected value is compared with a set value of a setting device 10 by a differential amplifier 11, and a motor 13 is driven by a controller 12 to control the deviation to become 0. An outlet nozzle 14 of a flux hopper 4 is moved up and down to control the height of flux accumulation continuously. |
