J. Hornik, P. Hajkova, E. Anisimov, and J. Rybnicek (CTU in Prague, Faculty of Mechanical Engineering, Department of Materials Engineering, ICDAM, Prague, Czech Republic): Causes of Inconel 622 Weld Cracking Problems related to the welding of duplex steel with Ni alloy Inconel 622 are described. The GTAW welding procedure was used for the root and SMAW of the main weld. The weldment was characterized by a tendency of the weld metal to cracking in the SMAW region during the bend test. Microstructural analysis of the weld was performed and supplemented by nanohardness measurements. The Charpy impact test and fractographic analysis were carried out. Microstructure of the weld exhibited the presence of hard particles, mostly of an oxide region in SMAW region. Their presence had a negative effect on the ductility of the weld. The oxide presence was probably caused by a technological discrepancy.