Tweco ArcMaster 401MST - Manual (Page 44)

ARCMASTER 401MST POWER SOURCE
INSTALLATION, OPERATION AND SETUP 3-14 Manual 0-5287
3.10 Setup for LIFT TIG (GTAW) Welding
For TIG welding a TIG torch with valve is required for this power source.
A. Remove all packaging materials. Do not block the air vents at the front or rear of the Power Source.
B. Connect the work lead to the positive welding terminal (+). Welding current flows from the Power Source via
dinse type connectors. It is essential, however, that the male plug is inserted and turned securely to achieve a
sound electrical connection.
C. Connect the optional TIG Torch to the negative welding terminal (-). Welding current flows from the Power
Source via dinse type connectors. It is essential, however, that the male plug is inserted and turned securely
to achieve a sound electrical connection.
CAUTION
Loose welding terminal connections can cause overheating and result in the male plug being fused in
the terminal.
!
WARNING
Before connecting the work clamp to the work piece make sure the mains power supply is switched off.
Secure the welding grade shielding gas cylinder in an upright position by chaining it to a suitable
stationary support to prevent falling or tipping.
D. Ensure that the gas cylinder is secured to a building pillar, wall bracket or otherwise securely fixed in an upright
position.
E. Select TIG mode by pressing Process Selection Button until TIG indicator lights up.
F. Connect the TIG Torch trigger switch / remote control to the 14 pin or 19 pin socket on the Power Source as
applicable. It will operate in lift TIG mode with either a remote connected to the 14 or 19 pin connector, or the
contactor enabled on the panel. The TIG Torch will operate in LIFT TIG mode.
G. Fit the Flowmeter/ Regulator to the gas cylinder then connect the gas hose from the TIG Torch to the Flowmeter
outlet. The Power Source is not fitted with a shielding gas solenoid to control the gas flow in LIFT TIG mode,
therefore the TIG Torch will require a gas valve.
TIG Welding Current Range Factory setting
Welding current I1 10 to 300 A (1 phase)
100
10 to 400 A (3 phase)
Table 3-8 TIG Welding Current
H. Arc Ignition. Open the valve 19 on the TIG welding torch. Briefly touch the workpiece with the tip of the electrode
at the point to be welded. Lift the electrode a little. The arc burns between the workpiece and the electrode
Art # A-12455
1 2
Figure 3-4 Arc Ignition