INFLUENCE OF MAGNETIC FIELD ON CRYSTALLIZATION OF WELDS IN ARC WELDING

摘要

A review of publications on metallurgical and casting industry showed that when analyzing the properties of liquid metals and alloys, many authors proceed from the concepts of their cluster structure. Cluster structure of liquid is a hypothesis, but it is confirmed by studies of diffraction of X-rays, electrons and neutrons, reflected from its surface. The work considers the existing concepts of a cluster being a crystal-like concentration of atoms. Around the clusters a softening zone exists, which consists of disordered atoms. Its volume does not exceed 3-5% and this provides the fluidity of many melts. The authors of publications have succeeded in explaining the forming structure of ingots, based on the cluster mechanism of the process of crystallization of liquid metals and alloys. The authors of this work suggested that the overheated liquid metal in the head part of the pool, which has smaller clusters, moves under the action of magnetic fields to its tail part, and provides a refinement of the primary structure of the weld metal.