Arc sensing system for automatic weld seam tracking (II)

摘要

Due to violent disturbance of the welding arc, signal processingis the key problem of ap- plication of the sensor. By means of thenew technique the arc sensor can recognize not only V-groove but alsolap joint and butt joint. The sensor has good recognition abilityeven for welding process with very large current disturbance, e.g.pulsed arc and short circuit welding process, et. The proposetechnique is developed on the basis of modern digital filteringtheory and mathematic transformation of the signals from time domaininto frequency domain.