Plasma arc welding requires two gas flowing from the nozzle from the plasma gas and shield gas flowing protective gas mask. Sometimes in order to enhance the protection, the need to use protection and ventilation in the back of the drag cover plate to expand the scope of protection gas. Plasma arc welding depends on the type of gas used in welding metal.
Plasma gas tungsten electrode should be inert, so as not to tungsten burning too fast. When a small current welding, plasma gas will be the role of pure argon. The nature of the material to be welded in accordance with the choice of pure argon, pure helium, argon, hydrogen mixed gas, argon-helium gas mixture of carbon dioxide and argon gas mixture at high current welding.
Protective gas on the base material generally should be inert. However, if the reactive gas does not affect the weld properties. It allows you to add active gas in the protective gas. High current welding, shielding gas composition and the same plasma gas. When a small current welding, the choice of pure argon gas, pure helium, argon and argon-helium gas mixture of hydrogen gas mixture.
