Micro-plasma arc welding gun

Abstract

The invention discloses a micro-plasma arc welding gun which comprises a tungsten electrode press head, a sealing ring, a tungsten electrode clamp, an upper gun body, an insulator, a lower gun body, a centering support pillar, a centering sleeve, a gun mouth, a protecting gas cap, a tungsten electrode and a handle. The micro-plasma arc welding gun disclosed by the invention has the following beneficial effects that the upper gun body and the lower gun body are high in heat conduction efficiency; due to an optimally designed lower gun body cooling water channel, the heat conduction travel is reduced, and the cooling effect of the gun mouth is improved; the tungsten electrode clamp, the centering support pillar and the centering sleeve can ensure that the tungsten electrode is coaxial with the gun mouth; on the premise that advantages such as small plasma diameter and high energy density are maintained for the gun mouth, the stiffness of the plasma arc can be reduced, low current overlaying under 50 amperes can be achieved, and the sizes of thin-wall components made of materials such as titanium alloy and nickel base alloy can be recovered through overlaying. In addition, the micro-plasma arc welding gun is compact in structure, so that the accessibility of the welding gun in working is improved.

Description

technical field [0001] The invention belongs to the technical field of arc welding equipment, in particular to a micro-beam plasma arc welding torch. Background technique [0002] The edges of thin plate parts made of rare metals such as titanium alloys and nickel-based alloys are often damaged during use. Except for the damaged parts, the dimensions and mechanical properties of the rest of the parts are not affected. In this case, If the parts are scrapped as a whole, it will cause great waste and lead to an increase in the overall operating cost of the equipment. [0003] At present, the restoration of the shape and size of thin-plate parts made of titanium alloys and nickel-based alloys mainly adopts argon tungsten arc welding and shaping after surfacing. Due to the low energy density and large diffusion angle of the arc used in argon tungsten arc welding, There are problems such as large welding heat-affected zone and poor mechanical properties of welded joints. Becaus...

AI Technical Summary

Problems solved by technology

[0002] The edges of thin plate parts made of rare metals such as titanium alloys and nickel-based alloys are often damaged during use. Except for the damaged parts, the dimensions and mechanical properties of the rest of the parts are not affected. In this case, If the parts are scrapped as a whole, it will cause great waste and lead to an increase in the overall operating cost of the equipment

[0003] At present, the restoration of the shape and size of thin-plate parts made of titanium alloys and nickel-based alloys mainly adopts argon tungsten arc welding and shaping after surfacing. Due to the low energy density and large diffusion angle of the arc used in argon tungsten arc welding, Problems such as large welding heat-affected zone and poor mechanical properties of welded joints

Because the diameter of the plasma arc used in the micro-beam plasma arc welding process is less than 1.5mm, the energy density is large, and the diffusion angle is small, it has become the preferred process for surfacing welding instead of argon tungsten arc welding. However, the current industrial production of micro-beam plasma arc welding torches The generated plasma arc has high stiffness, high plasma arc pressure, and strong stirring effect on the molten pool, so the weld seam formed by surfacing welding is poor; When surfacing welding thin plate parts, because the welding line energy is too high, it is easy to cause the base metal to collapse, and the width of the surfacing welding zone is too large, which increases the workload of subsequent plastic processing

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