The process of arc combustion caused by gas ionization between two electrodes and electron emission from cathode is called welding arcing. There are generally two ways of welding arc initiation: contact arc initiation and non-contact arc initiation.

Luoyang mechanical and electrical school can learn, one welder per person, until you learn. Teachers teach in small classes!

(1) After the contact arc welding power supply is turned on, the electrode (covered electrode or welding wire) directly contacts the workpiece in short circuit, and then the covered electrode or welding wire is pulled to ignite the arc, which is called contact arc. Contact arc striking is one of the most commonly used arc striking methods.

When the electrode is in short-circuit contact with the workpiece, because the surfaces of the electrode and the workpiece are not absolutely flat, they only contact at several bumps. The short-circuit current through these points is much larger than the normal welding current, which produces a lot of resistance heat, which makes the metal temperature in the contact part rise sharply, melt and even vaporize, causing strong gas ionization and electron emission. Then, at the moment when the electrode is turned on, because of the tiny arc gap, the electric field intensity reaches a great value, which makes the gas strongly ionized and the cathode emits electrons, thus igniting the arc.