Compact, lightweight, high-frequency oscillation device using electromagnetic force and corresponding bead formation phenomena

摘要

This paper describes the principle of the proposed high-frequency oscillation method, clarifies its oscillation capacity and investigates bead formation phenomena during method application to actual GMAW. The results obtained may be summarised as follows.1 The proposed high-frequency oscillation torch incorporating electromagnetic actuators consisting of solenoid coils and permanent magnets can be successfully arranged to perform arc welding with an overall weight of under 1 kg.2 The oscillating path of the proposed high-frequency oscillation device is characterised by stopping at both ends of the oscillating path and by high-speed transition at a speed averaging 400 mm/sec. The maximum attainable oscillation frequency extends up to 40 Hz. The time constant of the solenoid coil exciting current and the upper limit of the oscillation frequency are also amenable to improvements through oscillator weight reduction.3 GMAW experiments using the proposed method shows it to be effective for penetration control and bead width enlargement. This is due to the dispersion effect of the arc heat and the arc pressure.4 In horizontal fillet welding, slightly flattened beads are obtained, and the proposed method is effective for prevention of overlaps and undercuts.