Lincoln Electric TIG 275 TIG Weld Cycle Chart, Setup Guidelines for TIG Welding with AN Amptrol

B-10 OPERATION B-10

TIG WELD CYCLE CHART

2 or 4-STEP

4-STEP

With PULSE ON

4-STEP Trigger

4-STEP Trigger

Trigger

Trigger

No Pulsing

Re-closed or

Re-opened

Closed

1ST Open

During Upslope Time

2-STEP Trigger

after

SEE ITEM 12

SEE ITEM 12

or

Opened

Downslope Time

When Downslope

SEE ITEM 12

SEE ITEM 12

Drops Below

MAXIMUM OUTPUT

Background Setting

SETTING

CRATER-FILL

Adjustable 2-Max.A

LEVEL

SEE ITEM 6

Advanced

Panel Select:

Amptrol or Remote

Mach. Min.

(PEAK) Range

or

SEE ITEM 6 & 7

MIN. Setting

PULSE FREQ.

% ON TIME

(as w/o Panel)

Adjustable

Adjustable

MINIMUM OUTPUT

SEE ITEM 7

0.1-20 pps

5-95%

(Start) SETTING

SEE ITEM 14

SEE ITEM 15

Adjustable 2-50A

SEE ITEM 7

BACKGROUND

Adjustable

MIN.Setting -100% Peak

SEE ITEM 16

PREFLOW

UPSLOPE

DOWNSLOPE

POSTFLOW

Fixed 0.5 sec

Fixed<0.5 sec

Adjust 0 —10 sec

Adjust 2-60 sec

or x2

w/o Amptrol

w/ Advan. Panel

or x2

SEE ITEM 9

SEE ITEM 7

(Fixed 0 sec w/o)

SEE ITEM 9

SEE ITEM 17

START TIME

CRATER-FILL TIME

Manual

Manual in 2/4-Step

in 4-Step

w/ Restart Disabled

SEE ITEM 12

SEE ITEM 12 & TIG

Welding Features

SETUP GUIDELINES FOR TIG WELDING WITH AN AMPTROL

Both the Hand and Foot Amptrols work in a similar manner. They are meant to be used for remote current control for TIG welding using the machine’s 2-Steptrigger mode (See Item 12).

The Amptrol is capable of controlling the output of the Precision TIG over the range between the level preset by the Minimum Output control when the Amptrol is at its inactivated state, and the level preset by the Maximum Output control when the Amptrol is at fully- activated state.

It is important to note that even with the Precision TIG’s new MicroStartTM Technology, some tungstens may be difficult to start at the low (2 amps) minimum rating of the machine. Rather than guessing where to depress the Amptrol to start the arc reliably, the Minimum Output control allows presetting the exact level, so reliable starts, as well as minimum crater-fill levels, can be consistently obtained at the minimum Amptrol (inac- tivated ) state. FIGURE B.6 shows Precision TIG setup for TIG welding with an Amptrol.

USING THE START PEDAL FOOT AMPTROL (K870-1)

To further enhance reliability of consistently obtaining this minimum level just after the Amptrol’s start switch is closed, or just before it opens for crater-fill, the new K870-1 Start Pedal Foot Amptrol is available. Its independent start pedal on control pedal provides two- stage foot action to easily feel start switch closure at minimum output level for precise arc start and crater control. Also, an adjustable heel stop helps assure comfortable foot location.(See Figure B.5)

Currently available TIG foot pedal controls combine the arc start switch actuation in the same pedal action with the output control variable resistance. This technique provides no independent tactile feel of where the arc start switch actuates, and at what control level, for con- sistent TIG starting. Nor does it provide a way for con- sistent crater-fill control to feel at what decreasing con- trol pedal position the arc start switch will re-open causing arc out.

PRECISION TIG 275