Miller Electric CST 250 VRD - Manual (Page 29)

OM-220 812 Page 25
Trouble Remedy Possible Causes
Erratic or improper weld output. Weld cable too small or defective. Use proper size and type of weld cable (see Section 3-6).
Dirty or loose connections. Clean and tighten all weld connections (see Section 3-6).
Wandering arc Improper size tungsten. Use proper size tungsten (see Section 7).
Worn or defective tungsten. Use properly prepared tungsten (see Section 7).
Shielding gas flow too high. Reduce shielding gas flow rate (see Section 3-7).
Tungsten electrode oxidizing and not
remaining bright after conclusion of Shielding gas blown away from weld
zone.
Shield weld zone from drafts.
g g
weld.
Inadequate postflow time. Allow adequate postflow time to shield tungsten while it
cools, after welding stops.
Loose or leaking gas fittings. Check and tighten all gas fittings (see Section 3-7).
Water in torch. Refer to torch manual.