Bernard T-Gun 450 Owner's Manual page 29

8. Porosity in weld.
9. Gun running hot.
10. Liner is discolored full
length.
11. Sporadic feeding of
aluminum electrode.
*In some cases with aluminum and mild steels, it may be necessary to use a contact tip with either a larger or smaller bore size.
1. Insulator worn.
2. Gas diffuser damaged
3. Extreme heat or duty cycle.
4. Solenoid faulty.
5. No gas.
6. Flow improperly set.
7. Gas ports plugged.
8. Ruptured gas hose.
9. Control circuit loss.
10. Worn, cut or missing o-rings.
11. Loose fittings.
1. Exceeding duty cycle.
2. Loose or poor power connection.
1. Short circuit to electrode.
2. Broken copper stranding in power
cable.
1. Tip galling.
2. Synthetic liner melting.
3. Wire deformed by feeder rolls.
1. Replace nozzle / insulator.
2. Replace gas diffuser or o-rings.
3. Replace with heavy duty consumables.
4. Replace solenoid.
5. a. Install full tanks.
b. Check supply.
c. Check for hose leaks.
6. Adjust flow.
7. a. Clean or replace gas diffuser.
b. Clean nozzle.
8. Repair or replace cable or line.
9. See 'Electrode does not feed'.
10. Replace o-rings.
11. Tighten gun and cable connections to specified torque.
See Section 7 — Replacement on page 15.
1. a. Replace with properly rated Bernard MIG Gun.
b. Decrease parameters to within gun rating.
2. a. Clean, tighten or replace cable grounding connection.
b. Tighten gun and cable connections to specified torque.
See Section 7 — Replacement on page 15.
1. Isolate electrode reel from feeder and drive block. Consult
feeder manufacturer's manual.
2. Replace MIG gun.
1. Inspect and replace the contact tip.*
2. a. Replace liner.
b. Replace with composite liner.
c. Replace the neck and jump liner.
3. Adjust drive rolls as per feeder manufacturer's manual.
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