Multisource coaxial plasma arc cladding technology and equipment

Abstract

The invention discloses a multisource coaxial plasma arc cladding technology and equipment. The equipment comprises a welding gun mechanism, a feeding mechanism, a power supply mechanism and an ionicgas supply device; the welding gun mechanism comprises a plasma arc generating assembly, the plasma arc generating assembly comprises cathode bars and a lower gun body, a positive pole and a negativepole of an arc ignition circuit of the power supply mechanism are electrically connected with the lower gun body and the cathode bars respectively, the lower gun body comprises ionic gas flow channelsand conductive nozzles, the cathode bars are inserted into the ionic gas flow channels, the welding gun mechanism comprises a feeding guide nozzle and multiple cathode bars, the lower gun body comprises the ionic gas flow channels in one-to-one correspondence with the cathode bars and conductive nozzles, central axes of injection orifices of the multiple conductive nozzles converge at one point to form an intersection point, and the intersection point is located on a central axis of a discharge port of the feeding guide nozzle and located below the discharge port of the feeding guide nozzle.According to the multisource coaxial plasma arc cladding technology and equipment, the power distribution of the equipment is smoother, a welding line has low weld penetration depth and large weld width, and the equipment is more suitable for surface cladding and additive manufacturing, not only can improve welding line quality, but also can increase processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of forming and processing of metal parts, and in particular relates to a multi-source coaxial plasma arc cladding process and equipment. Background technique [0002] Plasma cladding technology is a means of mechanical surface repair and remanufacturing by using a water cooling system to control the nozzle arc, using a transferred arc as a heat source to obtain a high energy density plasma arc, and using various alloy powders and wire materials. Existing plasma arc cladding / surfacing equipment mostly uses a single plasma arc as a heat source, and one or more filling materials are fed to the plasma arc from one side or the periphery of the plasma arc. When the powder is used as the filling material, multiple powders are used to focus under the plasma arc; when the wire is used as the filling material, the single wire is fed from one side to the bottom of the plasma arc, which is the so-called paraxial wire fe...

AI Technical Summary

Problems solved by technology

[0003] However, the existing plasma arc cladding equipment has the following deficiencies: 1. If the filling material is wire material, the side-axis wire feeding method makes the appearance of the accumulated weld seam different under different motion modes. Additive manufacturing will cause cumulative errors and affect dimensional accuracy

When feeding wire in reverse or sideways, the end of the wire will interfere with the weld seam that has been formed, which will affect the stability of wire feeding

Because the wire and the accumulated weld seam interfere with the plasma arc during the movement, the arc length changes, which adversely affects the shape and quality of the weld seam.

2. If the filling material is powder, since the powder enters the plasma arc from the outside to the inside, it is difficult to achieve complete melting of the powder. On the one hand, the utilization rate of the material is reduced. On the other hand, the unmelted powder entering the molten pool may cause metallurgical defects.

In order to improve the weld seam quality, the existing plasma arc cladding equipment mostly adopts the method of increasing the plasma arc power or reducing the powder delivery speed, but this operation will increase the heat input of the part matrix or reduce the cladding efficiency

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