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This standard is intended for use when the stability of spot stability of welding machines complying with EN ISO 14744-1 is to be measured in connection with an acceptance inspection. It provides essential information to the procedure and apparatus to be used for making the measurements.

The stability of the spot position is a particularly significant parameter for prolonged welding applications and for electron beam welding with automatic devices positioning the workpiece. In such applications, the welding machine shall be able to reproduce, over prolonged periods and without additional correction of the position being required, a given beam-to-joint alignment. The purpose of measurement is to check whether and to what extent the electron beam generated by a welding machine keeps within the range of limit deviations specified for the spot position.