Maintenance - NewArc WFU12A-ILS Operational Manual

5. Maintenance

Note!
All Electric shocks are potentially fatal, switch off the machine and unplug from the
mains supply before carrying out any maintenance work.
It is very important that the Wire feed unit is regularly maintained. The amount of use and the working
environment must be taken into account when scheduling the maintenance periods. Careful use and
regular preventative maintenance will prolong the life of the machine and ensure trouble free operation.
Weekly
• Clean the exterior of the machine and remove any dirt and pieces of MIG wire that may have collected
inside the wire spool compartment.
• Remove any build up of dirt from the wire feed rollers.
• The wire tension adjuster should be set so that when the wire is restricted at the welding torch the
drive rollers slip. Remember if the pressure is set too high the wire may pile up behind the front wire
guide and undue strain will be put on the wire feed system leading to a reduced duty cycle and lifespan.
• If necessary, adjust the brake tension on the spool holder so that the wire spool stops at the same time
as the feed rollers.
• Inspect the machines exterior for obvious signs of damage.
• Check the condition of the welding cable, earth clamp and welding connectors for damage and any
sign of over-heating.
• Check the gas hose and regulator for leaks, remember that air leaks can result in weld porosity.
• Check the condition of the MIG welding gun, check for cuts in the cable sheath, condition of the liner
and condition of the contact tip. Remove any build up of spatter from inside the gas nozzle.
Three monthly
As per the weekly schedule, plus:
• Remove the cover from the machine and remove the build up of dust and debris from inside the
machine. Either use compressed air at low pressure or an industrial vacuum cleaner.
• Make a thorough visual inspection of the interior of the machine, look particularly for pieces of welding
wire and other foreign matter.
• Check the condition of the weld current input connector and Euro socket, look for any signs of
discolouration due to overheating, this is generally caused by poor connection of the welding power
leads due to poor quality welding connectors and can be a common cause of welding set failure.
• Check that the gas solenoid retaining nut is secure and that the gas hose inside the machine is in good
conditio and shows no sign of kinking or of rubbing on any internal component.
Annually
As per the three monthly schedule, plus:
• Have the wire-feeder calibration checked, if necessary have the machine re-calibrated by a Newarc
trained technician.
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