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Pulse spot welding machine is an important manufacturing and maintenance method in modern material processing manufacturing. Working principle: Plasma arc powder surfacing uses a hydrogen plasma arc as a heat source and a certain composition of wear-resistant and corrosion-resistant alloy powder as a filler metal. When surfacing welding, transfer arc is mainly used to form a molten pool on the surface of the workpiece. Alloy powder is continuously supplied as required. The welding torch is fed into the arc under the action of the powder flow. The powder is preheated in the arc column, in a molten or semi-melted state, sprayed into the workpiece molten pool, fully melted in the molten pool, and exhausted gas and floating slag. With the relative movement of the welding torch and the workpiece, the alloy pool gradually solidifies to obtain the required alloy coating on the workpiece. The overlay welding process is one of the effective methods to improve the wear resistance, corrosion resistance and impact resistance of metal surfaces. Pulse spot welding machine principle: Plasma powder surfacing is a surfacing process that uses plasma arc as a heat source and uses the high temperature generated by plasma arc to rapidly heat the alloy powder and the surface of the substrate to melt, mix, diffuse, and solidify. After the plasma beam leaves, self-excited cooling forms a high-performance alloy layer to achieve surface hardening and hardening of the part. Sub-reinforced concrete has the characteristics of high arc temperature, high heat transfer rate, good stability, and strong penetration controllability. By adjusting the relevant surfacing parameters, the thickness, width and hardness of the surfacing layer can be freely adjusted within a certain range.