Lincoln Electric TIG 375 manual Making a TIG Weld with AN Amptrol, Smaw Process, Gtaw Process

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B-13

OPERATION

B-13

 

 

 

MAKING A TIG WELD WITH AN AMPTROL

1.Install welding equipment per Section A-5.

2.Setup controls per Section B-10.

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

input supply (if used).

Note: The Precision TIG Under-Cooler (or Water Solenoid connected to the Cooler receptacle) runs with the Fan-As-Needed machine cooling fan (See Maintenance Section D), so the cooler fan and water pump will also not run continuously in idle, but will run while welding.

4.With the torch held safely away from everything, close the Arc Start Switch of the Amptrol and set the gas flow meter. Then open the switch. The welder is now ready for welding.

5.Position the tungsten electrode at the start of the weld at a 65° to 75° angle with the horizontal, in the direction of pushing travel, so that the electrode is approximately 1/8" (4 mm) above the work piece.

Close the arc start switch. This opens the gas valve to automatically purge air from the hose and torch, then shields the arc strike area. After the 0.5 sec- ond preflow time, the high frequency becomes available to strike the arc. When the arc strikes the torch coolant (if used) starts to flow. Also, if welding DC- TIG, the high frequency shuts off just after the arc strikes.

6.Hold the arc start switch closed at minimum Amptrol Start level (See Section B-10) until an arc is estab- lished, then increase the output to the desired welding level and push the torch in the direction of travel.

7.At the end of the weld, decrease the Amptrol output to the crater-fill level before releasing the arc start switch to start the Postflow time. Hold the torch gas shielding over the solidifying weld crater while post- flow time expires and the gas valve reopens. The torch coolant (if used) continues to flow for up to 8 minutes after the arc goes out (with the Fan-As- Needed feature) to assure torch cooling.

Repeat steps 5 through 7 to make another weld.

RECOMMENDED ELECTRODE AMPERAGE RANGES - Precision TIG 375

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 375

 

 

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.)

 

EWG

 

 

 

 

 

 

EWG

 

Aluminum

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.

*Balanced Wave, Unbalanced Wave requires derating of the electrode.

PRECISION TIG 375

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Contents Safety Depends on You Precision TIGSafety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a LʼArcThank You Table of Contents Installation Rated Input Single Phase onlyDuty Cycle-Applications Volts at Rated Amperes Amps Precision TIGRecommended Input Wire and Fuse Sizes Physical DimensionsTemperature Ranges Additional Output CapacitySafety Precautions Input and Grounding Connections Work Cable Connection Output CABLES, Connections and LimitationsStick Electrode Cable Connection TIG Torch Connection Figure A.2Auxiliary Power Connections Figure A.3Robotic Interface Connection Figure A.4Operation Product DescriptionPipe Thawing Welding SparksRecommended Processes and Equipment Recommended ProcessesProcess Limitations Equipment LimitationsControls and Settings Figure B.1 Control PanelOperation TIG Mode Menu DisplayDo not USE 4-STEP if Using AN Amptrol Remote Advanced Panel ControlsOperation TIG Welding Features Internal SET UP ControlsStick Welding Features Figure B.3 Figure B.4 TIG Weld Cycle Chart Setup Guidelines for TIG Welding With AN AmptrolFigure B.6 Smaw Process Making a TIG Weld with AN AmptrolGtaw Process Accessories Factory Installed OptionsField Installed Options Optional EquipmentMaintenance Safety PrecautionsRoutine and Periodic Maintenance Overload ProtectionService Procedures Component AccessSpark GAP Adjustment UNDER-COOLER ServiceTroubleshooting HOW to USE Troubleshooting GuideOutput Problems SymptomsCourse of Action Meter Problems GAS ProblemsHI-FREQ Problems Preset & Output Control Problems Stick Welding Problems TIG Welding ProblemsTIG Problems Wiring Diagram Wiring Diagram Dimension Print K2622-1 Domestic Precaucion Aviso DE