TIG Welding Current Ranges for Tungsten Electrodes - (Argon Shielding Gas)
Electrode
Diameter
(inches) 		Dcen, A Dcep, A High-Frequency
unbalanced ac, A 		High-Frequency
balanced ac, A
EWP
EWTh-1
EWTh-2
EWTh-3 		EWP
EWTh-2
EWTh-2
EWTh-3 		EWP EWTh-1
EWTh-2
EWZr 		EWTh-3 EWP EWTh-1
EWTh-2
EWZr 		EWTh-3
0.010 up to 15 --- up to 15 up to 15 --- up to 15 up to 15 ---
0.020 5-20 --- 5-15 5-20 --- 10-20 5-20 10-20
0.040 15-80 --- 10-60 15-80 10-80 20-30 20-60 20-60
1/16 70-150 10-20 50-100 70-150 50-150 30-80 60-120 30-120
3/32 150-250 15-30 100-160 140-235 100-235 60-130 100-180 60-180
1/8 250-400 25-40 150-210 225-325 150-325 100-180 160-250 100-250
5/32 400-500 40-55 200-275 300-400 200-400 160-240 200-320 160-320
3/16 500-750 55-80 250-350 400-500 250-500 190-300 290-390 190-390
1/4 750-1000 80-125 325-450 500-630 325-630 250-400 340-525 250-525