B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/00 (2006.01) B23K 9/10 (2006.01) B23K 9/16 (2006.01)
Patent
CA 2244304
The present invention is directed to an arc welding apparatus constructed of: a welding transformer 1, wherein a first tap T1 is provided at a point of half N/2 of the total number of turns N of the secondary winding of the transformer 1, the first tap T1 is connected to the electrification section 9 of a manual welding holder 8, a second tap T2 is provided at a point of N1 turns from the start Ts of the secondary winding, the second tap T2 is connected to a second thyristor 3, a first thyristor 2 and a third thyristor 4 are connected across both ends of the secondary winding, a third tap T3 is provided at a point of half N1/2 of N1 turns of the secondary winding and the third tap T3 is connected to a CO2 arc welding torch 10; a control circuit 6 for controlling these thyristors 2-4, a gate signal switchover circuit 5 for executing switchover between gate signals of the thyristors 2-4; and a reactor 7 for smoothing a welding current. The arc welding apparatus executes switchover between manual welding and CO2 welding by means of thyristors, thereby manufacturing the apparatus at low cost and achieving improved reliability.
Naruto Masafumi
Okubo Masayuki
Yasuhara Yoshimichi
Kirby Eades Gale Baker
Matsushita Electric Industrial Co. Ltd.
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