Lincoln Electric V200-T Operating Steps, Welding in TIG Mode, Remote Control Operation, Sept97

B-4 OPERATION B-4

OPERATING STEPS

WELDING IN TIG MODE

1.Connect the TIG torch and cable quick connect plug to the DC- output receptacle. This receptacle also contains an integral gas connection for the torch. Connect the work cable to the DC+ recepta- cle and to the work piece.

2.Set the Welding Process Switch to “2S” when using a hand or foot amptrol. When using an arc start switch, “2S or “4S” can be used.

3.Set the TIG Process Switch to the desired posi- tion.

4.Connect an optional Amptrol or Arc Start Switch to the Remote Control Connector.

5.Turn on the cylinder gas valve and adjust the flow regulator to obtain desired flow.

6.Turn the power switch to “230” or “460” as appropri- ate for your input voltage. NOTE: There will be a 0.5 second gas flow when the power is turned on.

7.Set the Current Control on the control panel to the maximum desired amps.

8.Depress the Amptrol or Arc Start Switch to energize the torch and establish an an arc with the work piece.

NOTE: When the TIG Process Switch is set to “2S” or “4S” TIG position, depressing the remote control will start a 0.5 second gas pre-flow before energizing the TIG torch. When the remote control is released the TIG torch is de-energized and gas flow will continue for the set post flow time (0 - 50 sec.).

REMOTE CONTROL OPERATION

A Foot Amptrol™ is optional with the V200-T for remote current control while TIG welding. An optional Hand Amptrol may also be used. An optional Arc Start Switch may be used to start and stop the weld- ing if no remote control of the current is desired. Refer to the Accessories section of this manual.

Both the Hand and Foot Amptrol work in a similar manner. For simplicity, the following explanation will refer only to “Amptrols”, meaning both Foot and Hand models. The term “minimum” refers to a foot pedal in the “up” position, as it would be with no foot pressure, or a Hand Amptrol in the relaxed position, with no thumb pressure. “Maximum” refers to a fully depressed Foot Amptrol, or a fully extended Hand Amptrol.

When the welder is in TIG modes activating the Amptrol energizes the electrode terminal and varies the output welding current from its minimum value of 1 amp, to the maximum value set by the Current Control on the control panel. This helps eliminate accidental high current damage to the work piece and/or tung- sten, and gives a fine control of the current. When the welder is in the stick mode a remote control has no effect and is not used.

It is important to note that, in some cases, the tung- sten will not start an arc at the minimum current because the tungsten may be too large or cold. To start an arc reliably, it is important to depress the Amptrol far enough so that the machine output current is near the tungsten operating range. For example, a 3/32” tungsten may be used on DC- to weld the full range. To start the weld, the operator may have to turn the current control up and depress the Amptrol approximately 1/4 of the way down. Releasing the Amptrol to its minimum position may not start the arc. Also if the current control is set too low, the arc may not start. In most cases, a large or cold tungsten will not readily establish an arc at low currents. This is normal. In DC-, the V200-T will start a 3/32, 2% thori- ated tungsten electrode at 15 amperes provided the electrode tip is properly grounded and not contaminat- ed.

INVERTEC V200-T Sept97