Continuous hardness-testing on moving steel bands in the course of production
Because hardness is a relatively simple test to carry out and because hardness values are indicative of other physical characteristics the determination of hardness values is widely used as a quality control activity. The continuing emphasis on continuous production techniques makes it desirable to develop continuous methods of determining hardness also on a continuous basis, especially so in the case of metal production where quality control is critical to the success of subsequent production stages. It was considered unlikely that existing methods of either a contact or non-contact nature were capable of satisfactory development against future requirements and it was decided to investigate the usefulness of directing laser beams at moving metal surfaces to establish any possible correlation between the results obtained and other physical properties. Trials were carried out using the 15 ns pulse from a Nd:YAG-Laser at various output levels between 10 MW and up to 1GW per sq. cm. using several different techniques to assess the results. For a variety of reasons it was not possible to establish any correlation between the measurements made and the strength characteristics of the material under examination.
Bibliographic Reference: EUR 18480 DE (1998) 121pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4666-0
Record Number: 199910896 / Last updated on: 1999-06-18
Original language: de
Available languages: de