Lincoln Electric 250 manual TIG Welding, Wire WELDING-CV

Page 21

B-5

OPERATION

B-5

 

 

 

TIG WELDING

The TOUCH START TIG setting of the MODE switch is for DC TIG (Tungsten Inert Gas) welding. To initiate a weld, the CONTROL dial is first set to the desired current and the tungsten is touched to the work. During the time the tungsten is touching the work there is very little voltage or current and, in general, no tungsten contamination. Then, the tungsten is gently lifted off the work in a rocking motion, which establishes the arc.

The ARC CONTROL is not active in the TIG mode. To STOP a weld, simply pull the TIG torch away from the work. When the arc voltage reaches approximately 30 Volts the arc will go out and the machine will reset the cur- rent to the Touch Start level. To reinitiate the arc, retouch the tungsten to the work and lift. Alternatively, the weld can be stopped by releasing the Amptrol or arc start switch.

The Ranger 250 can be used in a wide variety of DC TIG welding applications. In general the ‘Touch Start’ feature allows contamination free starting without the use of a Hi- frequency unit. If desired, the K930-2 TIG Module can be used with the Ranger 250. The settings are for reference.

Ranger 250 settings when using the K930-2 TIG Module with an Amptrol or Arc Start Switch:

Set the MODE Switch to the TOUCH START TIG setting.

Set the "IDLER" Switch to the "AUTO" position.

Set the "WELDING TERMINALS" switch to the "REMOTELY CONTROLLED" position. This will keep the "Solid State" contactor open and provide a "cold" electrode until the Amptrol or Arc Start Switch is pressed.

When using the TIG Module, the OUTPUT control on the Ranger 250 is used to set the maximum range of the CURRENT CONTROL on the TIG Module or an Amptrol if connected to the TIG Module.

WIRE WELDING-CV

Connect a wire feeder to the Ranger 250 according to the instructions in INSTALLATION INSTRUCTIONS Section.

The Ranger 250 in the CV-WIRE mode, permits it to be used with a broad range of flux cored wire (Innershield and Outershield) electrodes and solid wires for MIG welding (gas metal arc welding). Welding can be finely tuned using the ARC CON- TROL. Turning the ARC CONTROL clockwise from –10 (soft) to +10 (crisp) changes the arc from soft and washed-in to crisp and narrow. It acts as an induc- tance control. The proper setting depends on the pro- cedure and operator preference. Start with the dial set at 0.

Listed below are some wires suitable for use on this machine:

Innershield - NR-311, NS-3M, NR-207, NR-203 Ni 1%, NR-204-H.

Outershield - 0S-70, 0S-71M.

Solid wires for MIG welding - .035 (0.9 mm), and

.045 (1.1 mm), L-50 and L-56, .035 (0.9 mm) and

.045 (1.1 mm) Blue Max MIG 308 LS.

Contact your local authorized Lincoln Electric Distributor or the Lincoln Electric Company for specific wires used on certain applications with this machine.

TYPICAL CURRENT RANGES (1) FOR TUNGSTEN ELECTRODES(2)

Tungsten Electrode

DCEN (-)

DCEP (+)

Approximate Argon Gas Flow

 

TIG TORCH

 

Diameter in. (mm)

 

 

Flow Rate C.F.H. ( l

/min.)

 

Nozzle Size (4), (5)

 

 

 

 

 

 

 

 

 

 

 

 

 

1%, 2% Thoriated

1%, 2% Thoriated

Aluminum

 

 

Stainless Steel

 

 

 

 

 

Tungsten

Tungsten

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.010

(.25)

2-15

(3)

3-8

(2-4)

 

3-8

(2-4)

#4, #5, #6

 

0.020

(.50)

5-20

(3)

5-10

(3-5)

 

5-10

(3-5)

 

 

0.040

(1.0)

15-80

(3)

5-10

(3-5)

 

5-10

(3-5)

 

 

1/16

(1.6)

70-150

10-20

5-10

(3-5)

 

9-13

(4-6)

#5, #6

 

3/32

(2.4)

150-250

15-30

13-17

(6-8)

 

11-15

(5-7)

#6, #7, #8

 

1/8

(3.2)

250-400

25-40

15-23

(7-11)

 

11-15

(5-7)

 

 

5/32

(4.0)

400-500

40-55

21-25

(10-12)

 

13-17

(6-8)

#8, #10

 

3/16

(4.8)

500-750

55-80

23-27

(11-13)

 

18-22

(8-10)

 

 

1/4

(6.4)

750-1000

80-125

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 gases.

(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

= _ 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.

RANGER 250

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Contents Ranger California Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Table of Contents Installation Machine Specifications Ranger 250 K1725-2, K1725-4 Safety Precautions PRE-OPERATION Engine Service Electrical Connections Standby Power Connections Auxiliary Power ReceptaclesConnection of Ranger 250 to Premises Wiring Connection of an LN-23P Wire Feeder to the Ranger Connection of Lincoln ELEC- Tric Wire FeedersConnection of LN-7 or LN-8 to the Ranger Connection of the LN-25 to the RangerOperation Design FeaturesGeneral Description Engine OperationWelding Controls Weld Mode Selector SwitchARC Control Weld Output Terminals with Flange NUTWire Feeder Voltmeter Switch Weld Terminals Control SwitchEngine Controls PIN AmphenolWelder Operation StoppingTypical Ranger 250 Fuel Consumption Wire WELDING-CV TIG WeldingTypical Current Ranges 1 for Tungsten ELECTRODES2 Auxiliary Power ARC GougingRanger 250 Extension Cord Length Recommendations Accessories T12153-9 50 AMP, 120/240V Power PlugRecommended Optional Equipment Engine Maintenance Components MaintenanceKohler Engine Onan P220 OHVAIR PRE-CLEANER Service AIR Cleaner ServiceEngine OIL Change Engine OIL Refill CapacitiesSpark Plug Service AIR Filter Paper ElementSpark Plug Battery Maintenance Engine Adjustment Overspeed is HazardousCleaning the Battery Charging the BatteryWelder / Generator Maintenance HOW to USE Troubleshooting Guide TroubleshootingService Facility Persists,Contact your localLincoln Authorized Field Contact your local Lincoln Possible AreasTroubleshooting Troubleshooting Diagrams Diagrams Diagrams Diagrams Diagrams Engine Welders /LN-8 Connection Diagram Diagrams Diagrams Diagrams Diagrams Diagrams Diagrams W11 G4284Dimension Print Ranger 22.25 23.5015.25 15.50 Ranger Ranger Precaucion Warnung
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