The invention provides a large-area
metal wall
surface field patching surfacing
welding method. A synchronous moving mechanism is installed on a
welding gun of a surfacing
welding device, in a surfacing
welding process, a
graphite sliding block on the synchronous moving mechanism is always located at the back of a welding
pool and tightly pressed onto a surface welding layer by an elastic pressing mechanism on the synchronous moving mechanism, the
graphite sliding block moves together with the welding gun, and welding current enters into a workpiece through electric arcs from a welding wire of the welding gun and returns to the welding
machine power source negative pole from the
graphite sliding block. The surfacing welding device comprises the welding gun, a welding
machine power source and the synchronous moving mechanism. The synchronous moving mechanism comprises an elastic pressing mechanism and an insulation connecting plate. The elastic pressing mechanism comprises a shell, a pushing plate, a spring, an end cap, the graphite sliding block and a concave disk, and in surfacing welding, the spring generates a pressing force on the graphite sliding block. According to the large-area
metal wall
surface field patching surfacing welding method, the graphite sliding block is used for achieving the moving type connection between welding
machine ground wires and the workpiece, the backward
current distribution in the welding
pool is strengthened, and combined with an externally added
transverse magnetic field or a longitudinal
magnetic field, the problems of the welding
pool instability and organizational regulation and control caused by the gravity of
metal wall
surface field patching surfacing welding are solved.