The Effect of Electrochemical Composite Coatings with LaF-LaB Particles in Nickel-Copper Matrix on the Metallurgical Processes in Arc Welding of Low Alloy Ferrite-Pearlite Steels.

Development of welding consumables with fluorides and borides of rare earth metals is a promising area for improving the weldability of low alloy steels. As lanthanum fluoride and boride dissociate, lanthanum and boron dissolve in the weld pool and the welding arc plasma is saturated with fluorine. As a result of FeO, MnO, SiO deoxidation and FeS, MnS desulfurization, refractory lanthanum sulfides and oxides LaO, LaS are formed in the weld pool, which can be the crystallization nuclei in the weld pool and the origin of acicular ferrite nucleation.