This plasma welding robot adopts PTA (Plasma Transferred Arc) hardfacing technology, specially built for automatic hardfacing of sealing surfaces on butterfly valves, ball valves, gate valves and other industrial valves. Equipped with an infinite‑rotating welding torch, the system requires no heavy positioner. Workpieces are placed directly on the work platform. It supports horizontal, vertical, spiral and spherical overlay with cobalt‑based alloy powder and corrosion‑resistant welding wires for continuous batch production.

Integrated with intelligent seam tracking and high‑intensity color camera monitoring, real‑time welding visualization is available. Compared with imported counterparts, it delivers 40 % higher hardfacing efficiency and low dilution rate. Cobalt‑6 powder can achieve hardness performance equal to cobalt‑12, saving 1‑2 tons cobalt powder yearly and cutting material costs. Welding travel speed ranges from 500‑1500 mm/min with uniform bead formation and minimal post‑weld grinding work.

The workstation consists of CNC travelling mechanism, infinite‑rotating torch unit, plasma powder‑wire feeding system and visual monitoring module. It handles hardfacing for triple offset butterfly valves, ball valve cores and gate valve plates. One robot equals the output of 3‑5 skilled welders. Service life reaches over 15 years, reducing labor shortage and occupational‑hazard risks. It is a cost‑effective automatic hardfacing solution for valve manufacturers.