EN ISO 14744-3:2000

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Test arrangement
   4.1 General
   4.2 Faraday cup and electrical connections
5 Measurement procedure
   5.1 General
   5.2 Current losses
   5.3 Measuring the ripple
   5.4 Measuring the stability
   5.5 Measuring the reproducibility
6 Problems in measurement
7 Evaluation

This standard is intended for use when the beam current of electron beam weldingmachines complying with prEN ISO 14744-1:1999 is to be measured in connection with an acceptance inpection. It provides essential information on the procedure and apparatus to be used for making the measurements. The beam current is one of the significant parameters in electron beam welding. When the beam current impinges on the workpiece, it shall be stable and reproductible within given short-term and long-term limits. The purpose of the measurement is thus to check whether the variations in beam current are within these limits.