Lincoln Electric IM693 manual Feeding Wire Electrode, Idle Roll Pressure Setting, Making a Weld

POWER MIG 200

B-4 OPERATION B-4

FEEDING WIRE ELECTRODE

WARNING

When triggering, the electrode and drive mecha- nism are electrically “hot” relative to work and ground and remain “hot” several seconds after the gun trigger is released.

NOTE: Check that drive rolls, guide plates and gun parts are proper for the wire size and type being used. Refer to Table C.1 in Accessories section.

1.Turn the Readi-Reel or spool until the free end of the electrode is accessible.

2.While securely holding the electrode, cut off the bent end and straighten the first six inches. (If the electrode is not properly straightened, it may not feed properly through the wire drive system).

3.Release the pressure on the idle roll by swinging the adjustable pressure arm down toward the back of the machine. Lift the cast idle roll assembly and allow it to sit in an upright position. Leave the outer wire guide plate installed. Manually feed the wire through the incoming guide bushing and through the guide plates (over the drive roll groove). Push a sufficient wire length to assure that the wire has fed into the gun and cable assembly without restriction. Reposition the adjustable pressure arm to its origi- nal position to apply pressure to the wire.

4.Press gun trigger to feed the electrode wire through the gun.

IDLE ROLL PRESSURE SETTING

The optimum idle roll pressure varies with type of wire, wire diameter, surface conditions, lubrication, and hardness. As a general rule, hard wires may require greater pressure, and soft, or aluminum wire, may require less pressure than the factory setting. The optimum idle roll setting can be determined as follows:

1.Press end of gun against a solid object that is elec- trically isolated from the welder output and press the gun trigger for several seconds.

2.If the wire “birdnests”, jams or breaks at the drive roll, the idle roll pressure is too great. Back the adjustment knob out 1/2 turn, run new wire through gun, and repeat above steps.

3.If the only result was drive roll slippage, loosen the adjustment knob on the conductor plate and pull the gun cable forward about 6" (15 cm). There should be a slight waviness in the expose wire. If there is not waviness, the pressure is too low. Tighten the adjustment knob 1/4 turn, reinstall the gun cable and repeat the above steps.

MAKING A WELD

1.Check that the electrode polarity is correct for the process being used, then turn the power switch ON.

2.Set desired arc voltage tap and wire speed for the particular electrode wire, material type and thick- ness, and gas (for GMAW) being used. Use the Application Chart on the door inside the wire com- partment as a quick reference for some common welding procedures.

3.Press the trigger to feed the wire electrode through the gun and cable and then cut the electrode within approximately 3/8" (10 mm) of the end of the con- tact tip [3/4" (20 mm) Outershield®].

4.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).

5.When using Innershield electrode, the gas nozzle may be removed from the insulation on the end of the gun and replaced with the gasless nozzle. This will give improved visibility and eliminate the possi- bility of the gas nozzle overheating.

6.Connect work cable to metal to be welded. Work clamp must make good electrical contact to the work. The work must also be grounded as stated in “Arc Welding Safety Precautions”.

WARNING

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

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

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

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

10.When no more welding is to be done, close valve on gas cylinder (if used), momentarily operate gun trigger to release gas pressure, and turn off POWER MIG 200.