The method of estimation of the natural frequency of periodic crystallization of metal in welding conditions is presented. The frequency of crystallization is an objective reality caused by the release of latent heat at the interface (solid-liquid) surface. It is difficult to measure the frequency of latent heat release during welding, when the forces of its own electromagnetic field, the droplet transfer of the electrode metal, the wandering of the cathode spot, etc., act. Here you can add the action of alternating current in particular its strength when passing through the zero value. The use of a heat source of constant power that does not create any other disturbing effects in the form of a tungsten arc of direct current, an electron or laser beam, a plasma arc and the heat of a gas-welding flame without filler metal, made it possible to avoid the above disadvantages.It was suggested that the isotherms of crystallization on the surface of the joint may be followed by temporary cessation of crystallization on the basis of microstructure analysis. The presented method made it possible to determine the frequencies of natural temperature fluctuations on the interfacial surface depending on the welding speed, the chemical composition of the alloy using experimental examples.
Characteristics of droplet transfer of electrode metal during MMA depending on the chemical composition of the material of the rod of the coated electrode
