Lincoln Electric SVM 117-A service manual Making a Weld

B-8 OPERATION B-8

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NOTE: The unit will remember the run-in mode from the previous power down and return you to that same state the next time you power up. Therefore, it is not necessary to repeat either of the above procedures each time the unit is powered up. You need only per- form one of the above procedures when you want to change the run-in mode.

NOTE. When the gun trigger is first closed before turn- ing on the welder, there is no output power or wire feed until the trigger is opened and re-closed, regardless of the WIRE SPEED CONTROL POTENTIOMETER KNOB setting.

MAKING A WELD

1.Check that the electrode polarity is correct for the process being used.

2.Turn the POWER SWITCH to ON.

3.Set desired arc voltage and wire speed for the electrode wire, material type and thickness, and gas (for GMAW) being used.

NOTE: Use the Application Chart on the door inside the wire compartment as a quick reference for some common welding procedures.

NOTE: If Timer Kit is installed, see the Accessories Section of this manual to select the desired mode and for additional welding information Spot and Stitch modes.

4.Inch the electrode through the gun and cable.

5.Cut the electrode within approximately 3/8" (10mm) of the end of the contact tip or 3/4" (20mm) for Outershields.

NOTE: When the trigger is pulled, the wire feeder feeds wire at low speed regardless of the set wire feed speed until the welding arc starts or 2 seconds has elapsed. This feature enhances starting and makes it easier to set the stickout. The 2 second limit permits high speed loading of the gun and cable. To change run-in mode, refer to Changing Run In Mode Section.

6.If welding gas is to be used, turn on the gas supply and set the required flow rate (typically 25-35 CFH; 12-16 Liters/min).

NOTE: When using Innershield electrode, the gas nozzle may be removed from the insulation on the end of the gun. This will give improved visibility and elimi-

nate the possibility of the gas nozzle overheating.

7.Connect the work cable to metal to be welded. Work clamp (if used) must make good electrical contact to the work. The work must be grounded.

WARNING

When using an open arc process, it is necessary to use correct eye, head and body protection.

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8.Position electrode over joint. End of electrode may be lightly touching the work.

9.Lower welding helmet, close gun trigger, and begin welding. Hold the gun so the contact tip to work distance is about 3/8 inch (10mm) or 3/4" (20mm) for Outershield.

10.To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

11.When no more welding is to be done, close the valve on gas cylinder (if used), momentarily oper- ate gun trigger to release gas pressure.

12.Turn POWER SWITCH to OFF.

WIRE-MATIC 250