Tweco ArcMaster 401MST - Manual (Page 42)

ARCMASTER 401MST POWER SOURCE
INSTALLATION, OPERATION AND SETUP 3-12 Manual 0-5287
Weld Process Selection
Weld Mode
Weld Parameter STICK MIG
LIFT
TIG
Description
WELD (V) Ч √ Ч Weld voltage MIG Mode.
INDUCTANCE Ч √ Ч Inductance control in MIG Mode.
HOT START
√ × √
Start current in amps is added or subtracted.
In STICK mode the Hot Start is 100% to 200%,
factory default 125%; while in TIG mode the range
is 50% to 200%, factory default 50%.
WELD (A) √ × √ WELD (A) current for STICK or LIFT TIG.
ARC FORCE
√ Ч Ч
Adjusts percentage increase in welding current
and is proportional to arc length (arc voltage).
Table 3-5 Weld Process Selection verses Weld Mode
Weld Parameter Descriptions
WELD (V)
This parameter operates the MIG weld arc voltage in MIG mode.
INDUCTANCE
This parameter operates the INDUCTANCE when MIG welding. It controls the dynamic properties of the arc
in dip transfer welding mode. When this parameter is set to 0%, i.e. minimum inductance, the arc has a fast
response with a resulting crisp arc noise and coarse spatter. When this parameter is set to 200%, i.e. maximum
inductance, the arc has a slow response with a resulting soft arc and fine spatter.
NOTE
As the INDUCTANCE is increased, the WELD (V) may need to be adjusted to achieve the desired weld
characteristic.
HOT START
This parameter operates in Stick and TIG modes. Hot start can subtract 50% of the weld current during arc
starts some times desirable in TIG welding, or add up to 200% of weld current during arc starts, helping with
low hydrogen electrode ignition.
WELD (A)
This parameter operates the Stick, Gouging, and TIG weld current.
ARC FORCE CONTROL
This parameter operates in STICK mode only and is used to adjust percentage increase in welding current
and is proportional to arc length (arc voltage). This control provides an adjustable amount of arc control (or
dig). This feature can be particularly beneficial in providing the operator with the ability to compensate for
variability in joint fit up in certain situations with particular electrodes, e.g. cellulose and hydrogen controlled
electrodes. In all welding processes, the amount of penetration obtained is dependent on the welding current;
i.e. the greater the penetration, the greater the current.
Arc Force Position Effect on Welding Performance
Minimum (0) Soft arc, Low spatter, Low penetration
Medium (100%)
Normal arc, Improved fusion
characteristics, Normal penetration
Maximum (200%) Hard arc, Deep penetration
Table 3-6 Weld Parameter Descriptions