Anti-viscin thread control method

The invention provides an anti-viscin thread control method comprising the following the steps: feeding a solder wire doped with solder agent; carrying out constant voltage control according to a voltage setting signal (Er), thus outputting a welding voltage (Vw) and a welding current (Iw), and carrying out welding; if a welding start signal (St) is changed into a stop instruction, than the voltage setting signal (Er) is switched into an anti-viscin thread voltage setting value (Ear), thus stop welding. The anti-viscin thread voltage setting value (Ear) is set in vibration waveform, so the welding current (Iw) is set to vibration waveforms of triangle shape or sine wave shape, and the anti-viscin thread voltage setting value (Ear) is set to prevent short circuit in an anti-viscin thread control period (Ta); welding agent in the solder wire can be gasified so as to prevent slags from attaching to the front end of the solder wire. The solder wire with solder agent is used for arc welding so as to prevent slags from attaching to the front end of the solder wire, thus providing better arcing property.