Section 4 − Maintenance & Troubleshooting; Routine Maintenance; Troubleshooting - Miller Electric DB1812R Owner's Manual

SECTION 4 − MAINTENANCE & TROUBLESHOOTING

4-1. Routine Maintenance

40 Hours
Replace
unreadable
labels.
Replace cracked parts

4-2. Troubleshooting

NOTE
Trouble
Arc will not start. High frequency present
and visible at the torch. and visible at the torch.
Lack of high frequency; difficulty in es-
tablishing arc. tablishing arc.
Torch gas valve not working properly (if
applicable).
No shielding gas flow from torch.
Tungsten electrode oxidizing and not re-
maining bright after conclusion of weld. maining bright after conclusion of weld.
Excessive tungsten electrode con-
sumption. sumption.
Repair or
replace
cracked
weld cable.
Torch Body
Before using troubleshooting table, check selection and preparation of tungsten
electrode according to Section 5.
Check cable and work connections. Be sure weld circuit is complete (see Section 3-3).
Check and be sure shielding gas is present.
Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
Check cables and torch for cracks or bad connections. Be sure that torch cables are not close to any
grounded metal. Repair or replace necessary parts.
Check torch consumables. Be sure collet and collet body are correctly installed and tightened (see Sec-
tion 3-1).
Check welding power source High Frequency control, and if necessary, check and adjust spark gaps.
Have Factory Authorized Service Station/Service Distributor check valve.
Be sure valves on gas supply are open.
Check cable for kinks or blockage.
Check and tighten all gas supply fittings.
Check cables and torch for cracked insulation or bad connections. Repair or replace (see Section 4-1).
Shield weld zone from drafts.
Increase postflow time.
Increase gas flow rate. Check manufacture's recommendations.
Check and tighten all gas fittings.
Check gas valve and flow meter/regulator.
Select proper size and type tungsten. Properly prepare tungsten (see Section 5).
Select proper size and type tungsten. Properly prepare tungsten according to Section 5.
Check polarity setting on welding power source (see welding power source Owner's manual).
Check for proper gas flow rate. Check manufacture's recommendations.
If torch is water cooled, check torch and cables for water leaks. Repair or replace if necessary (see Sec-
tion 4-1).
Y Disconnect torch before maintaining.
Clean and
tighten weld
terminals.
Torch Cable
Remedy
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