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The wire feed of any welder is critical due to the amount of pressuer usd on the drive wheels. The condition of the liner in the cable. the type wire being used. There are different size drive wheels for different type of wire sizes also. I Completed the Lincoln basic and Advanced welder repair training last year and was supervisor of maintenance at an ALCOA fabrication company with over 50 mig welders in use. Over 90% of the maintenance calls for wire feed were improper adjustment of tension or improper wire feed for the type and thickness of metal being welded. There are several sites online, mylincoln.com or also miller.com where you can actually find a pressuer and speed setting for the type wire and thickness of metal you are welding on. Not saying you are setting up your machine incorrectly, just stating what I have experienced with trouble calls in the past. some of the welders were level IV certified and stilll had incorrect wire feed settings. It happens. If re adjusting the settings for wire feed speed and pressure on your drive wheels does not fix the problem then next you may try doing a resistance check on your potentiometers to make sure they are within tolerance and output it correct for the drive motor. There could be half a dozen things wrong with the drive function of the welder. Try these few checks if you do not have any joy with getting it to operate correctly come back and we wil continue trouble shooting the welder. P.S. check the roundness of the drive rollers to se if they are out of round. this can be big headache also.
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