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 weld- ing level and push the torch in the direction of trav- el.

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 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.)

 

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 275

Page 28
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Lincoln Electric 275 Making a TIG Weld with AN Amptrol, Recommended Electrode Amperage Ranges Precision TIG, Smaw Process

275 specifications

The Lincoln Electric 275 is a versatile multi-process welding machine that stands out for its advanced features and robust performance. Designed for both novice and experienced welders, the machine offers MIG, TIG, and stick welding capabilities, making it a valuable tool for a variety of applications.

One of the main features of the Lincoln Electric 275 is its power output. With an impressive selection of amperage settings, it can deliver between 25 to 275 amps, making it suitable for both thin and thick materials. This flexibility allows users to work on projects ranging from automotive repairs to industrial fabrication.

The machine utilizes inverter technology, which significantly enhances its efficiency and reduces power consumption. Inverter welders are known for their lightweight design and compact size compared to traditional transformer-based welders. This portability makes the Lincoln Electric 275 easy to transport to job sites, catering to both professional and hobbyist welders who require mobility.

Another defining characteristic of the Lincoln Electric 275 is its easy-to-use interface. The digital display provides clear readings, allowing users to effortlessly adjust settings for optimal performance. Additionally, the machine features a user-friendly control panel with distinct knobs for regulating voltage and wire feed speed, assisting welders in achieving precise welds.

The Lincoln Electric 275 is also equipped with advanced arc technologies. Its built-in arc control enhances the stability of the welding arc, resulting in a smoother, more consistent weld. Furthermore, the machine offers synergic controls that automatically adjust the voltage and wire feed speed based on the selected material and thickness, making the welding process more intuitive and reducing the margin for error.

Durability is another hallmark of the Lincoln Electric 275. Constructed with high-quality materials, the machine is built to withstand the rigors of daily use in demanding environments. Its design also incorporates efficient cooling mechanisms to prevent overheating during prolonged operations, ensuring longevity and reliability.

In conclusion, the Lincoln Electric 275 is a powerful and adaptable welding machine that combines advanced technology with user-friendly features. Its multi-process capabilities, inverter technology, and robust construction make it an essential tool for both professional welders and DIY enthusiasts. Whether tackling intricate projects or heavy-duty tasks, the Lincoln Electric 275 proves to be a reliable choice that does not compromise on performance.