Miller Electric DB1712RDI25 - Manual (Page 11)

OM-1600 Page 7
SECTION 4 − MAINTENANCE & TROUBLESHOOTING
4-1. Routine Maintenance
Y Disconnect torch before maintaining.
40 Hours
Replace
unreadable
labels.
Repair or
replace
cracked
weld cable.
Clean and
tighten weld
terminals.
Replace cracked parts
Torch Body Torch Cable
4-2. Troubleshooting
Before using troubleshooting table, check selection and preparation of tungsten
electrode according to Section 5.
NOTE
Trouble Remedy
Arc will not start. High frequency present
and visible at the torch
Check cable and work connections. Be sure weld circuit is complete (see Section 3-3).
and visible at the torch.
Check and be sure shielding gas is present.
Lack of high frequency; difficulty in es-
tablishing arc
Select proper size and type of tungsten. Properly prepare tungsten according to Section 5.
tablishing arc.
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.
Torch gas valve not working properly (if
applicable).
Have Factory Authorized Service Station/Service Distributor check valve.
No shielding gas flow from torch. 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).
Make sure collet is installed correctly (see Section 3-1).
Tungsten electrode oxidizing and not re-
maining bright after conclusion of weld
Shield weld zone from drafts.
maining bright after conclusion of weld.
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 of tungsten. Properly prepare tungsten (see Section 5).
Excessive tungsten electrode con-
sumption
Select proper size and type of tungsten. Properly prepare tungsten according to Section 5.
sumption.
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).