Miller Electric XMC 4000, Owner'S Manual

Page: 31 / 44

OM-221 694 Page 27
4-20. TIG Lift-Arc Welding
1
1 − 2
Seconds
“Touch”
Do NOT Strike Like A Match!
2
Ref. S-156 279
Lift-Arc Start
When Lift-Arc t button light is On,
start arc as follows:
1
TIG Electrode
2 Workpiece
Touch tungsten electrode to work-
piece at weld start point, enable out-
put and shielding gas with torch trig-
ger, foot control, or hand control.
Hold electrode to workpiece for
1-2 seconds , and slowly lift elec-
trode. Arc is formed when electrode
is lifted.
Normal open-circuit voltage is not
present before tungsten electrode
touches workpiece; only a low
sensing voltage is present between
electrode and workpiece. The
solid-state output contactor does
not energize until after electrode is
touching workpiece. This allows
electrode to touch workpiece with-
out overheating, sticking, or getting
contaminated.
Application:
Lift-Arc is used for the DCEN or AC
GTAW process when HF Start
method is not permitted, or to re-
place the scratch method.
4-21. Preparing Unit For Stick Welding
To select STICK welding process, proceed
as follows:
Follow safety precautions according to
Section 1.
Prepare unit according Section 3.
Using a cable with a proper adapter, con-
nect electrode holder to the MIG gun con-
nector.
Connect work clamp cable to the WORK
connector.
If a remote control is desired, connect it to
the Remote Control receptacle.
Turn unit On.
Allow time for unit to complete its start up
cycle.
Set STICK welding process using P3 push
button.
.
Be aware that STICK welding can be
enabled (L16 On) or disabled (L16 Off)
using P6 push button, and this status
is retained in the STICK welding pro-
cess memory.
4-22. Stick Welding Advanced Settings
HOT START
To change HOT START setting, proceed
as follows:
Press P2 to enter SET UP menu.
Select MENU FULL on D1 and D2 (see
Section 4-10).
Use E1 to change D1 to HOT.
D2 value is default setting of 100% (range
is 0% to 100%).
Use E2 to change D2 value.
This parameter increases output amper-
age at the start of a weld to eliminate elec-
trode sticking.
ARC FORCE
To change ARC FORCE setting, proceed
as follows:
Press P2 to enter SET UP menu.
Select MENU FULL on D1 and D2 (see
Section 4-10).
Use E1 to change D1 to ARC.
D2 value is default setting of 80% (range is
0% to 100%).
Use E2 to change D2 value.
When setting is increased, short-circuit
amperage at low arc voltage increases.