Lincoln Electric SVM162-B Making a TIG Weld with AN Amptrol, Smaw Process, Gtaw Process

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

Return to Section TOC Return to Master TOC

B-14

OPERATION

B-14

MAKING A TIG WELD WITH AN AMPTROL

Close the arc start switch. This opens the gas valve

to automatically purge air from the hose and torch,

1. Install welding equipment per Section A-5.

then shields the arc strike area. After the 0.5 sec-

ond preflow time, the high frequency becomes

2. Setup controls per Section B-9.

available to strike the arc. When the arc strikes the

torch coolant (if used) starts to flow. Also, if welding

3. Turn on the shielding gas supply, and torch coolant

DC- TIG, the high frequency shuts off just after the

input supply (if used).

arc strikes.

Note: The Precision TIG Under-Cooler (or Water

6. Hold the arc start switch closed at minimum Amptrol

Solenoid connected to the Cooler receptacle) runs with

the Fan-As-Needed machine cooling fan (See

Start level (See Section B-10)until an arc is estab-

Maintenance Section D), so the cooler fan and water

lished, then increase the output to the desired weld-

pump will also not run continuously in idle, but will run

ing level and push the torch in the direction of trav-

while welding.

el.

4. With the torch held safely away from everything,

7. At the end of the weld, decrease the Amptrol output

close the Arc Start Switch of the Amptrol and set the

to the crater-fill level before releasing the arc start

gas flow meter. Then open the switch. The welder

switch to start the Postflow time. Hold the torch gas

is now ready for welding.

shielding over the solidifying weld crater while post-

flow time expires and the gas valve reopens. The

5. Position the tungsten electrode at the start of the

torch coolant (if used) continues to flow for up to 8

weld at a 65° to 75° angle with the horizontal, in the

minutes after the arc goes out (with the Fan-As-

direction of pushing travel, so that the electrode is

Needed feature) to assure torch cooling.

approximately 1/8" (4 mm) above the work piece.

• Repeat steps 5 through 7 to make another weld.

RECOMMENDED ELECTRODE AMPERAGE RANGES - PRECISION TIG 275

SMAW Process

ELECTRODE

POLARITY

3/32"

1/8"

5/32"

Fleetweld 5P, Fleetweld 5P+

DC+

40 - 70

75 - 130

90 - 175

Fleetweld 180

DC+

40 - 80

55 - 110

105 - 135

Fleetweld 37

DC+

70 - 95

100 - 135

145 - 180

Fleetweld 47

DC-

75 - 95

100 - 145

135 - 200

Jet-LH MR

DC+

85 - 110

110 - 160

130 - 220

Blue Max Stainless

DC+

40 - 80

75 - 110

95 - 110

Red Baron Stainless

DC+

40 - 70

60 - 100

90 - 140

Mild steel procedures are based on recommended procedures listed in C2.10 8/94 and the maximum rating of the PRECISION TIG 275

Excaliber 7018 procedures are based on Jet-LH 78 MR

Blue Max procedures are based on C6.1 6/95

Red Baron Procedure are based on ES-503 10/93

GTAW Process

Electrode Polarity

DC-

AC*

Approximate Argon

Electrode Tip Preparation

Sharpened

Balled

Gas Flow Rate

Electrode Type

EWZr

C.F.H. (l/min.)

EWTh-1, EWCe-2

EWTh-1, EWTh-2

EWTh-2, EWLa-1

EWP

EWCe-2, EWLa-1

Stainless

Electrode Size (in.)

Aluminum

EWG

EWG

Steel

.010

Up to 15 A.

Up to 15 A.

Up to 15 A.

3-8

(2-4)

3-8

(2-4)

.020

Up to 15 A.

10 to 15 A.

5 to 20 A.

5-10

(3-5)

5-10

(3-5)

.040

Up to 80 A.

20 to 30 A.

20 to 60 A.

5-10

(3-5)

5-10

(3-5)

1/16

Up to 150 A.

30 to 80 A.

60 to 120 A.

5-10

(3-5)

9-13 (4-6)

3/32

Up to MAX. A.

60 to 130 A.

100 to 180 A.

13-17 (6-8)

11-15 (5-7)

1/8

X

100 to 180 A.

160 to 250 A.

15-23

(7-11)

11-15

(5-7)

Tungsten electrodes are classified as follows by the American

Welding Society (AWS):

Pure .........................................EWP...........green

+1% Thoria ..............................EWTh-1......yellow

+2% Thoria ..............................EWTh-2......red

+2% Ceria................................EWCe-2 .....orange

+1.5% Lanthana ......................EWLa-1......black

+0.15 to 0.40% Zirconia ..........EWZr..........brown

Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.

PRECISION TIG 275

Balanced Wave, Unbalanced Wave requires derating of the electrode.