Plasma Welding: Unstable Pilot Arc
Posted: Mon Aug 08, 2011 5:28 am
On our welding machine using plasma welding process, unstable pilot arc behavior occurred. In a difficult to be determined time and condition the pilot arc starts to “flicker” .It can happen directly after starting the arc, after some time (2 – 3 hours) of arc burning or just after using higher amperage (during welding). When the flickering of the arc occurs the deterioration of the weld quality is observed. With no parameter changed in the program it is visible that the flow and melting of the material is different.
In case of leakeges, dirty installation etc., we have tried a lot, but we haven't found the root yet. I hope that someone has an idea what the root of the problem could be.
Now an additional questions: On the two attached pictures you can see two different colours of the welding line. What could cause this?
In case of leakeges, dirty installation etc., we have tried a lot, but we haven't found the root yet. I hope that someone has an idea what the root of the problem could be.
Now an additional questions: On the two attached pictures you can see two different colours of the welding line. What could cause this?
- normal colour of the welding line
- normal colour.JPG (58 KiB) Viewed 590 times