[en] The influence of stress-relief heat treatment on the intergranular corrosion behaviour and on the microstructure of submerged arc strip, pulsed MIG and manual arc welded Inconel-600 type claddings as well as submerged arc strip, and wire-welded stainless steel claddings, has been investigated. For Inconel-600 type claddings the applied corrosion test methods were a modified Strauss test (GOST 6032-58, AM), the Huey test (ASTM A 262-70, C), the Streicher test (ASTM G-28-72), and an electrochemical test. The results depend strongly on the heat treatment condition of the cladding. The measured corrosion rates are not in consistence with each other. The intergranular corrosion susceptibility of stainless steel claddings was investigated from different depths and layers of the claddings. The applied test method was the modified Strauss test. It was observed that the precipitation of M₂₃C₆-carbides took place at austenite/austenite boundaries or at austenite/delta ferrite boundaries. This has a great influence on the corrosion behaviour. The influence of the welding method and heat treatment on the microstructure of the claddings was investigated using transmission electron microscopy. (author)