Pendulum head for submerged-arc welding - using a pulse generator to control electrode swing in welding gap

摘要

A pulse-generator with adjustable frequency is used to control the side to side swing of the welding-head in the welding-head in the welding-gap, and the movement corresponds to a predetermined fraction of the interval between two pulses, the remaining fraction constituting a period of rest. The pendulum is moved by a double-acting compressed-air cylinder, its normal movement being controlled by a guide-roller located at the bottom of the electrode-wire feeder; this guide-roller swings between the two sides of the gap between the two plates being welded. A pulse-generator and a series of valves control the supply of air to the cylinder and hence the movement of the pendulum w.r.t. time. During the interval between the pulses, the pendulum remains at one side of the welding gap.