Lincoln Electric IM520-B manual Typical Current Ranges for Tungsten Electrodes

Page 21

 

 

 

 

 

 

 

 

 

 

 

 

 

OPERATION

 

 

 

 

 

 

 

TABLE 3

 

 

 

(2)

 

 

 

 

 

 

 

 

 

 

 

 

(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 pure helium shielding gasses.

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

1% Thoriated . . . . . . . . EWTh-1 2% Thoriated . . . . . . . . EWTh-2

Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.

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

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

#4

= 1/4 in.

(6 mm)

#5

= 5/16 in.

(8 mm)

#6

= 3/8 in.

(10 mm)

#7

= 7/16 in.

(11 mm)

#8

= 1/2 in.

(12.5 mm)

#10

= 5/8 in.

(16 mm)

(5)TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles, which are less prone to breakage, but cannot withstand high temperatures and high duty cycles.

TIG WELDING SEQUENCE OF OPERATION (2-STEP MODE)

1.Connect an Arc Start Switch or an Amptrol to the Remote Receptacle.

2.Turn on the welder, gas supply and water supply (if so equipped). The Control Panel Display and red LEDS will illuminate when the power is on.

3.Select the TIG 2-Step Weld Mode.

4.Select Local (if using an Arc Start Switch) or Remote (if using an Amptrol) current control. Set the output current using the Amps Up/Down keys. The output current setting will be displayed on the Ammeter.

5.Select Continuous High Frequency if welding with AC polarity, or Start Only High Frequency if welding with DC- polarity. High Frequency Off can be used for scratch start welding.

6.Select AC or DC- electrode polarity. See Table 2.

7.If welding with AC polarity, select Auto Balance™. This gives the optimum ratio between cleaning and penetration, automatically adjusted for the output current. If manual adjustment of the AC Wave Balance is desired, select Manual Balance, and adjust the wave balance with the Cleaning and Penetration keys. See the Advanced Features section for more information on setting and using the AC Wave Balance.

8.Select TIG Pulser On or Off. If the TIG Pulser is on, adjust the pulse frequency with the Pulses Per Second Up/Down keys. See the Advanced Features section for more information on setting and using the TIG Pulser.

9.Set the Afterflow time with the Seconds Up/Down keys. Afterflow time provides shielding gas flow (and cooling water, if used) after the weld. Use short Afterflow times with low currents and small tungstens, use long afterflow times at high output currents with large tungstens.

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Contents Square Wave TIG Safety Electric Shock can kill Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE SûretéPlease Examine Carton and Equipment For Damage Immediately Table of Contents Installation Select Suitable Location Safety PrecautionsStacking TiltingRear Panel Input ConnectionsTIG Torch Connection Output ConnectionsStick Electrode Cable Connection Operation Safety InstructionsOperating Instructions General WarningsOperation Work Design Features and Advantages Operational Features and ControlsGeneral Description Recommended Processes EquipmentLimitations Welding CapabilityControl Panel Keys Controls and SettingsCase Front Controls DisplayRecommended Polarity Settings for TIG Welding Hand and Foot Amptrol Accessory OperationWelding Operation TIG WeldingTypical Current Ranges for Tungsten Electrodes TIG Welding Sequence of Operation 2-STEP ModeAdvanced TIG Welding Features TIG Welding Sequence of Operation 4-Step ModeAC Wave Balance and Auto Balance Stick Welding Auxiliary PowerOverload Protection ALL MachinesOptions / Accessories AccessoriesInstallation of Field Installed Options Undercarriage FunctionMaintenance MaintenanceRoutine and Periodic Maintenance General Assembly Exploded View How To Use Troubleshooting Guide TroubleshootingTroubleshooting Guide Problems Possible Areas Symptoms MisadjustmentsRecommended Course of Action Troubleshooting Function Problems TIG Mode Problems TIG Welding Problems Troubleshooting Stick Welding Problems Wiring Wiring Diagram Square Wave TIG 255 Code 10451, 10452 Wiring DiagramNew Lessons in Arc Welding How To Read Shop DrawingsNeed Welding Training? Basic CoursePrecaucion WarnungAtenção Warnung Limited Warranty