27. of October 2016
to mess. 18
I have just proposed a principal methode to sustain welding current, when otherwise having a “crackling” arc. (put as a question!)
In broad lines of demand a big enough power-choke will help to get some stability. 10 Henrys or more.
The welding current needs a low OHM DC resistance in the choke = heavy winding thread.
An air gap in the core counters the tendency to magnetically satisfy the core = loosing its ability to resist changes in the current.
Practical gaps are about 1/10 —> 1/20 mm. Usually kept under control with a paper or lacquer film.
The welding machine needs a big condensator on its output to swamp up swinging currents made by the arc and the choke.