What is the name of the welding process that uses molten slag to produce coalescence of metals?

The welding process that utilizes molten slag to achieve coalescence of metals is known as Electroslag Welding (ESW). In this method, a flux material is melted to form slag, which serves as both a thermal insulator and a medium for the heat generated by the electrical arc. The molten slag surrounds the weld area, providing a controlled environment that helps to create a strong bond between the metals being joined.

ESW is particularly effective for welding thick sections of metal and is commonly used in situations requiring high productivity and deep penetration. The usage of the molten slag in this process not only enhances the welding quality but also protects the weld pool from oxidation and contamination, which are crucial for creating strong and durable welds.