Phenomena and Mechanisms -- On the Origin of Weld Solidification Cracking -- New Insight into the Mechanism of Ductility-Dip Cracking in Ni-base Weld Metals -- Influence of Welding Speed on the Hot Cracking Resistance of the Nickel-Base Alloy NiCr25FeAlY During TIG-Welding -- The Role of Segregation of Oxygen in Welding Alloys of the INVAR Type -- Character of Hot Crack Formation During Welding…