Metallurgical features of plasma welding of thick-walled molds made of chromium bronze for smelting large titanium ingots

Tangential entry of binary plasma-formed inert gas mixture into plasmotron positively influences on the welding process for a number of parameters, but the vortex state of the plasma arc event causes air inflow, resulting in oxida- tion of the metal and its fragility. To avoid embrittlement of the metal welded by plasma welding of chromium bronze molds BrH08, the content of chromium in the range 0,8…1,2 % is required. This is provided by the use of the additive powder wire with 22 % Cr and 2 % Ti.