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Plasma surfacing
Nov 30, 2017

Plasma surfacing

Fundamental

The plasma arc welding is based on plasma arc as the heat source. The high temperature generated by the plasma arc heats the alloy powder and the surface of the substrate rapidly and melts, mixes, diffuses and solidifies. After the plasma beam leaves, it self-shocks to form a high-performance alloy Layer, in order to achieve the part of the surface hardening and strengthening of the welding process, due to the plasma arc with high arc temperature, heat transfer rate, good stability, penetration controllable strong, by adjusting the parameters related to the deposition, Welding layer thickness, width, hardness within a certain range of freedom to adjust. After the plasma powder welding, the interface between the base material and the surfacing material is formed, and the bonding strength is high; the surfacing layer is compact and has good corrosion resistance and abrasion resistance; the dilution of the base material and the surfacing material is reduced and the change of the material properties is small; The use of powder as a surfacing material can improve the selectivity of the alloy design, in particular, the smooth surfacing of refractory materials to improve the wear-resistant parts, high temperature, corrosion resistance. Plasma powder surfacing with high productivity, beautiful shape and surfacing process easy mechanization and automation.

Technical characteristics

1, Surfacing alloy layer and the workpiece substrate metallurgical combination, high bonding strength; recognized worldwide welding strong binding force equipment;

2, Surfacing speed, low dilution rate; powder plasma arc welding dilution rate can be controlled at 5% to 10% or less;

3, Surfacing layer of dense, beautiful appearance; easy to achieve efficient automated production, improve labor productivity and reduce labor intensity;

4, In the rust and oil on the surface of metal parts without complex pre-treatment process, direct plasma powder arc surfacing;

5, Compared with other plasma welding equipment, construction convenience, low consumption, high efficiency, practical easy to operate, easy maintenance;

6, Plasma arc temperature is high, energy concentrated, process stability, caused by the workpiece on the residual stress and deformation is small;

7, Good controllability. By adjusting the current size, gas flow, powder feeding speed, surfacing speed and swing amplitude to control the effect of surfacing, resulting in excellent quality surfacing layer.

8, Using a wide range of materials. Surfacing alloy powder as a welding material, from casting, rolling, drawing and other processing technology constraints, according to the different performance requirements of the different components of the alloy powder configuration, especially for those hard to wire but easy milling of hard resistance Ground alloy to obtain the required performance of the overlay.

9, Welding large parts of high efficiency. Commonly used submerged arc welding and gas welding for processing, but with the increasing requirements of many workpiece surface, the ordinary welding equipment can not meet the processing requirements, and plasma automatic cladding equipment can greatly limit the integrity of the process And high efficiency of the two major problems, for large workpiece surfacing wear layer or repair large area cracks have unique advantages. The surface temperature of the workpiece is lower than 200 after argon arc welding.

Application range

Plasma arc welding can be widely used in petroleum, chemical, construction machinery, mining machinery and other industries, such as various types of valve sealing surface (conventional gate valve, globe valve, check valve, safety valve, etc.) Oil drill pipe, bearings, shafts, rollers, picks after wear repair, its application prospects are very broad.


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