25-08-2017, 09:32 PM
Presentation on Plasma Arc Welding
1Presentation on Plasma.pptx (Size: 222.82 KB / Downloads: 43)
Plasma Arc Welding
Plasma Arc Welding is the welding process utilizing heat generated by a constricted arc struck between a tungsten non-consumable electrode . Plasma is a gaseous mixture of positive ions, electrons and neutral gas molecules.
Gases used for plasma arc welding.
Plasma gas – flows through the orifice and becomes ionized.
Shielding gas – flows through the outer nozzle and shields the molten weld from the atmosphere
Back-purge and trailing gas – required for certain materials and applications.
Transferred arc process
It produces plasma jet of high energy density and may be used for high speed welding and cutting of Ceramics, steels, Aluminum alloys, Copper alloys, Titanium alloys, Nickel alloys.
Non-transferred arc process
It produces plasma of relatively low energy density. It is used for welding of various metals and for plasma spraying (coating). Since the work piece in non-transferred plasma arc welding is not a part of electric circuit, the plasma arc torch may move from one work piece to other without extinguishing the arc.
Applications of plasma arc welding
Used for welding for light purpose.
For complicated areas.
Even used for metal cutting purposes.
Used for obtaining good surface finish.