Forward and reverse feed AC arc welding method
A technology of AC arc and welding method, which is applied in arc welding equipment, welding equipment, manufacturing tools, etc., and can solve problems such as unstable welding status and changes
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[0064] figure 1 It is a block diagram of a welding device for carrying out the forward and reverse feed AC arc welding method according to Embodiment 1 of the present invention. The following reference figure 1 to illustrate the blocks.
[0065] The inverter circuit INV takes a 3-phase 200V AC commercial power supply (not shown) as an input, rectifies and smoothes the AC commercial power supply to generate a DC voltage, and performs inverter control on the DC voltage according to a drive signal Dv described later. , thus outputting high-frequency AC.
[0066] The high-frequency transformer INT changes the high-frequency AC into a voltage value suitable for welding. The secondary rectifier group D2 rectifies the converted high-frequency AC, and outputs positive and negative DC voltages.
[0067] The output polarity of the welding device is switched by ON / OFF control of the electrode positive polarity switching element PTR and the electrode negative polarity switching elemen...
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