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Principle of plasma arc surfacing
Release time:
2023-02-10
Plasma arc is divided into two basic forms: transfer type and non-transfer type according to the connection mode of power supply. The two poles of the transfer-type power supply are respectively connected to the electrode and the workpiece, the arc burns between them, and the water-cooled nozzle acts as a contraction. The two poles of the non-transfer type power supply are respectively connected to the electrode and the water-cooled nozzle. The workpiece is not connected to the power supply, and the nozzle is both an electrode and a contraction effect. Transfer type and non-transfer type exist at the same time called hybrid plasma arc, surfacing is a hybrid and transfer type plasma arc as the heat source.
Plasma arc is divided into two basic forms: transfer type and non-transfer type according to the connection mode of power supply. The two poles of the transfer-type power supply are respectively connected to the electrode and the workpiece, the arc burns between them, and the water-cooled nozzle acts as a contraction. The two poles of the non-transfer type power supply are respectively connected to the electrode and the water-cooled nozzle. The workpiece is not connected to the power supply, and the nozzle is both an electrode and a contraction effect. Transfer type and non-transfer type exist at the same time called hybrid plasma arc, surfacing is a hybrid and transfer type plasma arc as the heat source.
When combined plasma arc surfacing is used, two independent DC arc welding machines are generally used as power sources to supply non-transferred arc and transferred arc respectively. The alloy powder is pre-heated in the arc column, in a molten or semi-molten state, sprayed into the molten pool of the workpiece, fully melted in the molten pool, and discharged gas and slag. By adjusting the transferred arc and non-transferred arc current, powder feeding and other process specification parameters, the melting of the alloy powder and the heat transferred to the workpiece are controlled. With the relative movement of the welding torch and the workpiece, the alloy molten pool gradually solidifies, and the welding structure with high density and high bonding strength is obtained on the workpiece.
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