Lincoln Electric SP-100 IM366-B Operator's Manual page 25

Low or no gas flow
Arc unstable
Erratic or Intermittent
Arc - Poor Starting
"Hunting" Arc
Cylinder valve closed
Gas flow not set correctly
Cylinder out of gas
Leak in gas line
Clog or Leak in gun
Wrong welding polarity
Wrong size, worn and/or
melted contact tip
Worn work cable or poor connections
Loose electrode connections
Open cylinder valve
Set proper flow rate
Get new cylinder of gas
Inspect and replace
Check for obstruction or defective seals
Check polarity - Refer to proper section
Replace tip - remove any spatter on end of tip
Inspect - repair or replace as necessary
Be sure electrode lead is tight, gun cable tight in
wire feeder contact block, gun nozzle and gun
tip tight
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