B-12OPERATION

3.If the only result was drive roll slippage, loosen the gun cable Fast-Mate™ connection nut from the front of the SP-255 and pull the gun cable forward about 6” (152 mm). There should be a slight wavi- ness in the exposed wire. If there is no waviness, the pressure is too low. Tighten the thumbscrew 1/4 turn, lock the gun cable in place and repeat the above steps.

MAKING AN AUTO MODE WELD

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

2. Press

then select:

3. Press

then select:

4.If Spot or Stitch timing modes are required, per- form either step 4.a. for Spot or step 4.b. for Stitch; otherwise, go to step 5.

4.a.Press

then select:

 

 

 

 

IDEALARC SP-255 OCT94

Press

again to return to previous

 

display.

4.b.Press

then select:

 

 

 

 

Press

again to return to previous

 

display.

5.Inch the electrode through the gun and cable and then cut the electrode within approximately 3/8 inch (9.5 mm) of the end of the contact tip [3/4 inch (19 mm) for Outershield® electrodes].

6.If welding gas is to be used, turn on the gas sup- ply and set the required flow rate [typically 25-35 CFH (12-16.5 I/min)].

7.When using Innershield® electrode, the gas noz- zle may be removed from the insulation on the end of the gun and replaced with the gasless noz- zle. This will give improved visibility and eliminate the possibility of the gas nozzle overheating.

8.Connect work clamp 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.

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

10.Lower welding helmet, close gun trigger, and begin welding. Hold the gun so the contact tip to work distance is about 3/8 inch (9.5 mm), [3/4 inch (19 mm) for Outershield electrodes].

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

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Image 24
Lincoln Electric SP-255 manual 12OPERATION, Making AN Auto Mode Weld