Temperature and density distribution in mechanical vibration wood welding

Nondestructive evaluation of wood joints welded by linear vibration welding was performed with an infrared (IR) thermography technique, which allowed the maximal and average peak temperature profile/distribution to be measured. The density profile/distribution at the joint interface was measured by X-ray microdensitometry. The results show that the width of the welded zone also varies as a function of the maximum temperature reached during welding and that the maximum temperature reached at the ends of the specimens is lower than that obtained in the central part of the specimens. This paper is dedicated to Prof. Dr. Dr. h.c. mult. Walter Liese on the occasion of his 80th birthday.