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power source manual reference provides relevant parameters, melting electrode is caused by DCEP, melting electrode is caused by incorrect electrode size, melting electrode is caused by too much heat, tungsten contamination is caused by tungsten electrode contact, Typical TIG welding problems are poor welds, Typical TIG welding problems are melting electrode, Typical TIG welding problems are arc instability, DCEP must be altered to DCEN, tungsten electrode contact is prevented by high freqency start up, moisture is prevented by cleaning, poor welds is caused by slow gas flow, poor welds is caused by moisture, poor welds is caused by contaminated metal, relevant parameters are suited to welding conditions, slow gas flow is corrected by power source manual reference, incorrect electrode size is corrected by power source manual reference, contaminated metal is prevented by cleaning, incorrect polarity is corrected by power source manual reference, arc instability is caused by incorrect polarity, arc instability is caused by tungsten contamination, arc instability is caused by incorrect arc length, arc instability is caused by contaminated metal, incorrect arc length is corrected by power source manual reference, too much heat is corrected by cooling, tungsten contamination occurs in molten weld