Miller A-250 Series Owner's Manual - Page 10

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Miller A-250 Series Owner's Manual
4-2. Connecting Torch With Two-Piece Cable
.
If applicable, install high-frequency unit.
Torch Without Gas Valve
Torch With Gas Valve
Tools Needed:
11/16 in.
Notes
OM-282751 Page 6
4
5
8
7
4
−
9 5
7
!
2
Obtain the following hose:
3
1
1
Connections
2
3
4
5
6
7
Connect work clamp to a clean, paint-
6
free location on workpiece, close to
weld area.
Use wire brush to clean weld joint
area.
8
9
2
Valve controls gas preflow and post-
flow. Open valve on torch just before
3
welding.
Preflow is used to purge the immedi-
ate weld area of atmosphere.
Postflow is required to cool tungsten
and weld, and to prevent contamina-
tion of tungsten and weld. After weld-
ing, leave valve open about 1 second
for every 10 amperes of weld current.
Close valve on torch when postflow is
finished.
6
Turn Off welding power source
power before installing torch.
Gas Hose With 5/8-18 Right-
Hand Fittings
Regulator/Flowmeter
Gas Cylinder
Welding Power Source
Torch Power Cable
Torch Gas-In Hose
Work Clamp
Foot Control
Gas Valve
805554-A