Method for the automatic measurement of the mean eccentricity of the welding wire against the welding powder coating of moving welding electrodes by X-ray absorption

摘要

As welding electrodes are mass-produced, the mean eccentricity of a number of the electrodes' wires with respect to their surrounding sheaths is monitored, by sequentially passing parallel ones of the electrodes radially past an X-ray source. For each electrode a comparison is made of the X-ray radiation absorbed by the sheath on one side of the wire with that on the other side of the wire. The absorption measurements indicate when the sheath begins to pass the source, when the rod begins to pass the source, when the rod stops passing the source, and when the sheath stops passing the source. The absolute values of the comparisons are totaled to obtain an indication of the average eccentricity.