The paper deals with partial verification of mechanical properties (through waveform measurements hardness HV10) obtained after SAW multi-pass welding in "ultra" narrow gap. Simulated homogenous welds of high pressure (HP) turbine rotors (30CrMoNiV5-11) formed with various types of filler materials (TOPCORE 838 B Thermanit MTS 616) using the same temperature cycle and subsequent heat treatment were tested. The detailed evaluation of hardness measurements HV10 was performed on the prepared metallographic test specimens. The test specimen made by Thermanit MTS 616 shows higer hardness values then the specimen made by TOPCORE 838 B.
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