I have a older (98-00 range) SW 250. It welds fine in DC with HF start. But when welding alum the arc is unstable and most times has to be scratch started. Have done all the typical things. Tungsten prep, good ground, cleaned points, adjusted points, checked gas, etc. I'm concerned the HF maybe going out, would just like to confirm that before I start spending money.
No announcement yet.