Methods and tools for control of crystallization of weld metal at arc welding (review and analysis)
The facilities and principal methods for manipulation of crystallization in weld metal as tool to improve joint structure and working properties of welded constructions are considered. Classification of methods of impact on crystallization with highlight of active and passive impact methods is presented. It is shown that the active methods for manipulation of crystallization in weld metal are based on controlled pulse and oscillation processes introduced into molten metal. There is paid attention to mechanical impacts implemented with help of modern high dynamic mechatronic systems with PLC control. Range of specific examples of welded joints made with various technologies of impacts on crystallization of weld metal with analysis of obtained structures and possible technical operational effect is considered.