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 tung- sten 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 establish- es 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 current 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 ʻTouch Startʼ feature allows contamination free starting without the use of a Hi-fre- quency 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 "REMOTE- LY 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 CONTROL. 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 inductance con- trol. The proper setting depends on the procedure and oper- ator 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%.

•Outershield - 0S-70, 0S-71M.

•Solid wires for MIG welding - .035 (0.9 mm), and .045 (1.1 mm), Super Arc 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 cer- tain 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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Lincoln Electric IM919 manual TIG Welding, Wire WELDING-CV, Typical Current Ranges 1 for Tungsten ELECTRODES2
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IM919 specifications

The Lincoln Electric IM919 is a highly advanced multi-process welding machine that combines versatility and efficiency, making it a go-to choice for professional welders and fabrication shops. Known for its robust design and user-friendly interface, the IM919 is engineered to perform a wide range of welding processes, including MIG, TIG, and stick, enhancing its application for various projects.

One of the standout features of the IM919 is its intuitive control panel. Designed with a clear digital display, it allows welders to easily select and adjust settings for voltage, wire feed speed, and amperage with precision. This accessibility makes it suitable for both novice and experienced users, providing a seamless experience in the welding process.

Technologically, the IM919 incorporates Lincoln Electric’s advanced welding technologies. The machine employs an inverter-based power supply, which offers a lightweight design and improved energy efficiency. This inverter technology significantly enhances arc stability, ensuring consistent weld quality across various materials, including steel, aluminum, and stainless steel. With a maximum output of around 300 amps, the IM919 is capable of handling heavier gauge materials while maintaining a compact form factor.

Additionally, the IM919 features a synergic control mode, which automatically adjusts parameters based on the selected wire type and diameter. This function aids in optimizing the welding process and minimizes trial and error, allowing for faster, more reliable results. Moreover, the machine is equipped with a powerful cooling system that prevents overheating during extended operation, thus extending its overall lifespan.

Durability and safety are paramount in the design of the IM919, as it comes with an IP23S rating, which means it is protected against water and dust ingress, making it suitable for various working environments. Enhanced safety features, such as overload protection and thermal cut-off, ensure that the welder remains operationally safe even under demanding conditions.

In summary, the Lincoln Electric IM919 is a state-of-the-art welding machine that excels in versatility, user-friendliness, and durability. With its advanced technologies and features, it stands out as an essential tool for professionals seeking quality and reliability in welding applications. Whether in a busy workshop or on a job site, the IM919 delivers outstanding performance, making it a valuable investment for anyone in the welding trade.
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