HOT WIRE TIG (TUNGSTEN INERT GAS) WELDING DEVICE

摘要

PURPOSE:To eliminate arc blow influence, and to improve the welding accuracy and the operability by an inexpensive power unit, by setting a wire output current peak value to half or above of a special arc output current peak value, and setting it as a correct interval intermittent electric conduction. CONSTITUTION:A molten pool is formed by making a DC arc current of a prescribed value flow to a tungsten electrode 4 from a base metal 1, and heating a weld zone by a generated arc 5. On the other hand, between the base metal 1 and a filler wire 7a, a DC current is made to flow from a wire power source 23, and a prescribed hot wire TIG welding is executed by a molten wire. On the other hand, a prescribed level voltage of an input terminal 24a3 is changed to a pulse voltage of a PWM outputting circuit 24a, also set as an output of an interval control device 24 whose electric conduction period and electricity cut-off are =3ms and =5ms, respectively, by timers 24b, 24c, and a peak current value of the wire 7a is set to an intermittent current being =1/2 of an arc peak current value. In this case, an arc blow influence is eliminated practically, and by using an inexpensive power source which is not a high output, the welding accuracy and the operability are improved.