XY-9 Pin Plug & Socket

Welding wire feed units are used in combination with geared PMDC motor for MIG welding. It has series of rollers that pushes the wire out to the welding torch. On larger power MIG welders the wire feed unit can be separate. The large spool of wire should be held on with a torque nut. The nut should be tight enough to keep the spool from unravelling so as to avoid over-run (birds nesting) when trigger is released, but not so tight that the rollers can’t pull the wire from the spool. The wire from the spool goes into a set of rollers that pull the wire off of the big roll, this then pushes the wire up to the torch to the tip ready for welding.