Lincoln Electric SP-100 service manual Shielding GAS, Making a Weld

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B-5	OPERATION
FIGURE B.5	FIGURE B.6

Gun Handle

Contact Tip

Gas Diffuser/
Contact Tip	Wire Electrode

Gas Nozzle 3/8" – 1/2" Electrical Stickout

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WARNING

When inching the welding wire, the drive rolls, the gun connector block and the gun contact tip are always energized relative to work and ground and remain energized several seconds after the gun trigger is released.

7.Refer to Figure B.5. Remove gas nozzle and con- tact tip from end of gun.

8.Turn the SP-100 ON (“I”).

9.Straighten the gun cable assembly.

10.Depress the gun trigger switch and feed welding wire through the gun and cable. (Point gun away from yourself and others while feeding wire.) Release gun trigger after wire appears at end of gun.

11.Replace contact tip and gas nozzle.

12.Refer to Figure B-6. Cut the wire off 1/4” – 3/8” (6

– 10 mm) from the end of the tip. The SP-100 is now ready to weld.

SHIELDING GAS

When using the GMAW process, a cylinder of carbon dioxide (CO2) or argon-carbon dioxide mixed shielding gas, flow regulator, and an inlet gas hose must be obtained. Refer to the ACCESSORIES section for more information about selecting gas cylinders for use with the SP-100.

1.For CO2, open the cylinder very slowly. For argon- mixed gas, open cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

2.If using a regulator with an adjustable flow meter, close the gun trigger and adjust the flow to give 15

– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20 -– 25 CFH (10 – 12 I/min) when welding out of

position or in a drafty location for CO2]. For argon mixed gas, trigger to release gas pressure, and turn off the adjust the flow to give 25 – 30 CFH (12 – 14 I/min).

3.Keep the cylinder valve closed, except when using the SP-100. When finished welding:

a) Close the cylinder valve to stop gas flow.

b) Depress the gun trigger briefly to release the pressure in the gas hose.

c) Turn off the SP-100.

MAKING A WELD

1.See Recommended Processes And Equipment section for selection of welding wire and shielding gas and for range of metal thicknesses that can be welded.

2.See the Application Guide on the inside of wire feed section door for information on setting the SP-100 controls.

3.Set the Voltage (“V”) and Wire Speed (“olo’”) con- trols to the settings suggested for the welding wire and base metal thickness being used.

4.Check that the polarity is correct for the welding wire being used and that the gas supply, if required, is turned on.

5.When using Innershield electrode, remove the gas nozzle and install the gasless nozzle. This will improve visibility of the arc and protect the gas dif- fuser from weld spatter. Refer to the MAINTE- NANCE section for details on nozzle replacement.

SP-100