Deposition welding on cylindrical bore of workpieces - using centrifugal force to hold filler powder in bore, and pyrometer for automatic process control

摘要

A workpiece is clamped in the chuck of a driven headstock, which carries a ring receiving electric welding current from one pole of a power supply. The second pole of the power supply is connected to an electrode holder arm (I) which is mounted on a slide so the electrode can be moved towards or away from the bore of the workpiece, and its angle adjusted. The slide is mounted on a carrier which is driven by a spindle so arm (I) can be moved into and out of the workpiece. The spindle is also used to keep a photoelectric pyrometer coaxial with the electrode but on the outside of the workpiece. The pyrometer monitors the external temp. of the workpiece and adjusts the speed of the spindle, and also the speed of a screw feeder delivering an alloy filler powder to the welding zone. Piece is used e.g. for reinforcing or repairing steel bushes by deposition arc welding using centrifugal force. A uniform coating thickness is obtd. together with uniform penetration.