Miller Bobcat 225 NT, Owner'S Manual

Page: 57 / 74

53
OM-405
13.2 Typical MIG Process Control Settings
These settings are guidelines only. Material and wire type, joint design, fitup, position, shielding
gas, etc. affect settings. Test welds to be sure they comply to specifications.
Note
ST-800 354
1/8 or
.125 in
Material thickness determines weld
parameters.
Convert Material
(.001 in = 1 ampere)
.125 in = 125 A
Select Wire Size
Wire Size Amperage Range
.030 in
.035 in
.045 in
40 – 145 A
50 – 180 A
75 – 250 A
.035 in
Select Wire Speed
Select Voltage
Wire
Recommendation
.030 in
.035 in
.045 in
2 in per ampere
1.6 in per ampere
1 in per ampere
Wire Speed
2 x 125 A = 250 ipm
1.6 x 125 A = 200 ipm
1 x 125 A = 125 ipm
Set voltage midway between high/low voltage.
Low voltage: wire stubs into work
High voltage: arc is unstable (spatter)
125 A based on 1/8 in
Thickness to
(Amperage)
material thickness
Size (Approx.)
Amperage (A)
Wire speed (amperage) controls weld pe-
netration (wire speed = burn-off rate)
Voltage controls height and width of
weld bead.
ipm = inch per minute