Manufacturing gluing-in-rods under low temperaturesand with shorter process times using inductionand resistive heating

This paper summarizes joint research efforts of the University of Kassel and Fraunhofer IFAM, focusing on resistiveand inductive heating as techniques to achieve fastcuring in the particular context of tests on glued-in rods, as performed in the last2 years. In different series of experiments,conducted on metallic bars glued into timber, the difficulties practitioners face with regard to temperature controlare described. In a further set of experiments, induction iscombined with a pre-applicable structural adhesive (PASA);it is shown how an innovative combination of PASA with induction heating leads to a process of gluing G-FRP rods into timber that substantially gains in terms of process quality andtime. In the final series, in which a 1 K epoxy is mixed with metallic particles that exhibit a Curie temperature adapted tothe curing temperature of the adhesive, we show how the induction process can be run without any outside control,leading to a technical solution adapted to practitioners.