Three electrodes was welded on the pipeline, could you tell me how to setup voltage on the three electrodes? volts is: 3 phase 120V 50hz.

I have setup following volts on the electrodes,

first electrode: 120*2^0.5 sin(314t)

second electrode: 120*2^0.5 sin(314t-120)       120 is 120C  phase angle

Third electrode:120*2^0.5 sin(314t-240)            240 is 240C phase angle

How ever I found this is wrong after runing