A mechanical device used to impart oscillatory motion to electrode holders, within limitations of stroke and amplitude in arc welding. It is used to meet a wide range of welding conditions, particularly in gas metal arc welding (GMAW).
Commercial units are available to linearly oscillate loads at frequencies of 30 to 240 cycles per minute, with infinite adjustments within this range and with running amplitude adjustment of from 0 to 18 mm (0 to 3/4 in.). Other oscillators are available in which the motion is that of a pendulum, with strokes up to 62 mm (2-1/2 in.) wide.
The types of motions imparted by oscillators are harmonic or uniform, or a combination, with dwell as required. The motions are produced by linkages or cams. The units are driven by electric motors and are controlled mechanically or by an electronic governor.