OM-257 798 Page 28
6-3. 30 Points Of Mechanics In MIG Welding
30 Pts MIG − 2014-09
Primary Power
S Check primary power connection at line disconnect switch or receptacle and/or cord plug.
S Check primary power connection at welding power source.
Secondary Power
S Check secondary weld output connections at welding power source.
S Inspect condition and routing of positive weld cable to wire drive motor.
S Check connection of positive weld cable to wire drive motor.
S Inspect condition and routing of negative weld cable to fixture.
S Check connection of negative weld cable to fixture.
S Inspect condition of any rotary grounds, grounding shoes or other auxiliary grounds.
S Check installation, routing and condition of welding gun.
Shielding Gas
S Check gas hose connection to shielding gas supply regulator.
S Check shielding gas flow rate.
S Check gas hose routing.
S Check gas hose connection at wire drive housing.
S Check gun connection at wire drive and be sure O−rings seal at drive housing.
S Check condition of gas diffuser.
S Check condition of nozzle.
S Check O-ring for proper sealing at nozzle.
Welding Wire
S Inspect condition of de-reeler. Check for wear at quick-connect coupling and replace if necessary.
S Check placement of payoff pack or drum for smooth feed path.
S Inspect condition and routing of input conduit.
S Check installation of quick-connect coupling at rear of wire drive so that it does not contact drive rolls. Check for wear and replace if necessary.
S Check drive rolls and replace if worn.
S Check for drive roll tension setting.
S Check intermediate guide for proper size to match wire size and replace if worn.
S Check for proper length of liner at both ends and be sure it is cut without burrs.
S Check liner for proper size to match wire size.
S Check liner for wear and clean out to prevent plugging.
S Check contact tip for proper size to match wire size.
S Check contact tip for wear and change at regular intervals.
S Check contact tip for a tight fit and secure installation at gun.
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