The welding blocks are forged out of the material 1.0577+N (St 52-3) and are marked with the identification number of the permissible nominal WLL.

Welding should be carried out by a qualified person according to ISO 9606-1.

The joint faces must be free from impurities like oil, colour etc. The chosen welding point must be suitable for the corresponding force introduction. The engaging surface must be plain. Given an uneven surface, the weld blocks have to be re-adjusted.