B-6

B-6

OPERATION

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8.Digital Voltmeter - This meter displays welding voltage, as measured on the output studs of the Square Wave TIG 275. After welding is complete, the meter displays the welding voltage corre- sponding to the peak welding current and displays this value for approximately 5 seconds.

9.Thermal Protection Light - A yellow light which only lights when an over temperature situation occurs. See the Maintenance Section for more information on thermostatic protection.

10.Power Switch - Controls the input power to the Square Wave TIG 275.

11.Polarity Switch - Selects DC+, AC or DC- welding polarity without reconnecting leads. DO NOT SWITCH WHILE WELDING.

12.Twist Mate Electrode and

13.Work Connections - Easy to connect electrode and work connections. This style Electrode Connection makes the gas and current connec- tions for the TIG torch at the same time. (Adapter plugs are provided with the machine.)

14.Remote Receptacle - For Amptrol, Arc Start Switch or Robotic Interface connection.

15.Optional Water Solenoid Connections - Easy to install this optional feature which allows for water flow control for water cooled torches.

WELDING OPERATION

TIG WELDING

Familiarize yourself with the Controls and Settings Section before attempting operation of the Square Wave TIG 275.

TIG WELDING GUIDELINES

TIG welding can be done in either the TIG 2-Step or the TIG 4-Step Weld Mode. TIG 2-Step is typically used with Hand or Foot Amptrols, with Remote Current control. TIG 4-Step typically uses an Arc Start switch and Local Current Control, because it provides a very brief current upslope, and a .5 to 10 second adjustable current downslope. TIG 4-Step also functions like a trigger interlock, making it unnecessary to hold down the Arc Start switch during a weld. This feature requires that the remote control device in use must have separate Arc Start and Output Control mecha- nisms. Read the TIG Welding Sequence of Operation sections for more details on 2-Step and 4-Step opera- tion.

Recommended tungsten electrode sizes, stickouts, currents, cup or nozzle sizes are shown in Table B.1.

SINCE WELDING APPLICATIONS CAN VARY, THIS CHART IS INTENDED AS A GUIDE ONLY.

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(2)

 

 

 

 

 

 

TABLE B.1 TYPICAL CURRENT RANGES FOR TUNGSTEN ELECTRODES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC

 

 

 

Approximate Argon

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gas Flow Rate

 

 

 

 

 

 

DCEN ( - )

DCEP ( + )

Unbalanced Wave

 

Balanced Wave

 

 

C.F.H. (1/min.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tungsten

 

 

 

 

1%, 2%

 

 

1%, 2%

 

 

 

 

 

 

 

Electrode

 

1%, 2%

1%, 2%

 

Thoriated

 

 

Thoriated

 

 

 

 

 

TIG Torch

 

Diameter

 

Thoriated

Thoriated

Pure

Tungsten

 

Pure

Tungsten

 

 

 

Stainless

Nozzle

 

in. (mm)

 

Tungsten

Tungsten

Tungsten

Zirconiated

 

Tungsten

Zirconiated

 

Aluminum

Steel

Size (4), (5)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.010

(.25)

 

2-15

(3)

2-15

2-15

 

2-15

---

3-8

(2-4)

3-8

(2-4)

#4, #5, #6

 

0.020

(.50)

 

5-20

(3)

5-15

5-20

 

10-20

5-20

5-10

(3-5)

5-10

(3-5)

 

 

0.040

(1.0)

 

15-80

(3)

10-60

15-80

 

20-30

20-60

5-10

(3-5)

5-10

(3-5)

 

 

1/16

(1.6)

 

70-150

10-20

50-100

70-150

 

30-80

60-120

5-10 (3-5)

9-13 (4-6)

#5, #6

 

3/32

(2.4)

 

150-250

15-30

100-160

140-235

 

60-130

100-180

13-17 (6-8)

11-15 (5-7)

#6, #7, #8

 

1/8

(3.2)

 

250-400

25-40

150-210

225-325

 

100-180

160-250

15-23 (7-11)

11-15 (5-7)

 

 

5/32

(4.0)

 

400-500

40-55

200-275

300-400

 

100-240

200-320

21-25 (10-12)

13-17 (6-8)

#8, #10

 

3/16

(4.8)

 

500-750

55-80

250-350

400-500

 

190-300

290-390

23-27 (11-13)

18-22 (8-10)

 

 

1/4

(6.4)

 

750-1000

80-125

325-450

500-630

 

250-400

340-525

28-32 (13-15)

23-27(11-13)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) When used with argon gas. The current ranges shown must be reduced when using argon/helium or

(4)

TIG torch nozzle “sizes” are in multiples of 1/16ths of an inch:

 

 

 

pure helium shielding gasses.

 

 

 

 

#4 = 1/4 in.

(6 mm)

 

 

 

 

 

 

 

(2) Tungsten electrodes are classified as follows by the American Welding Society (AWS):

#5 = 5/16 in.

(8 mm)

 

 

 

 

 

 

 

Pure . . . . . . . . . . . . . . . EWP

 

 

 

 

#6 = 3/8 in.

(10 mm)

 

 

 

 

 

 

 

1% Thoriated . . . . . . . . EWTh-1

 

 

 

 

#7 = 7/16 in.

(11 mm)

 

 

 

 

 

 

 

2% Thoriated . . . . . . . . EWTh-2

 

 

 

 

#8 = 1/2 in.

(12.5 mm)

 

 

 

 

 

 

 

Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for

#10 = 5/8 in.

(16 mm)

 

 

 

 

 

 

 

2% Thoriated Tungsten in AC and DC applications.

 

(5)

TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles,

(3) DCEP is not commonly used in these sizes.

 

 

 

which are less prone to breakage, but cannot withstand high temperatures and high duty cycles.

SQUARE WAVE TIG 275

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Lincoln Electric SVM141-A service manual Welding Operation, TIG Welding Guidelines, Twist Mate Electrode
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SVM141-A specifications

The Lincoln Electric SVM141-A is a cutting-edge solution designed for operators requiring precision, efficiency, and versatility in their welding applications. This machine is known for its compact form but robust feature set, making it an ideal choice for both professional welders and industrial applications.

One of the standout features of the SVM141-A is its advanced inverter technology. This innovation allows for a stable arc, providing consistent results even under varying conditions. The machine minimizes power consumption, making it energy-efficient without compromising performance. The inverter technology also supports a wider input voltage range, making the SVM141-A suitable for use in diverse environments and job sites.

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In summary, the Lincoln Electric SVM141-A is a versatile, efficient, and user-friendly welding machine that appeals to a wide range of users. Its advanced inverter technology, multi-process capabilities, safety features, and durable construction make it a strong contender in the welding market, suitable for both professionals and hobbyists alike. Whether it’s for light fabrication, repairs, or industrial welding tasks, the SVM141-A meets diverse needs with precision and reliability.
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