Effect on the chemical activity of flux on the properties of deposited metal in electroslag welding and remelting

Abstract

The effect of the chemical activity of flux on the properties of deposited metal of Mn–Ni–Mo–V steels, produced by electroslag welding and electroslag remelting, is discussed. It is shown that an increase in the chemical activity of flux by increasing its silica content to 16–24% (FTs-21 flux) in the remelted metal increases the fraction of easily deformed non-metallic oxide inclusions and the number of zones with reduced hardness in the structure of the metal. This increases the elasticity properties and strain capacity of the metal in the process of relaxation of welding stresses and in the formation of the required mechanical properties of the welded joints after final heat treatment. Also, the risk of formation of reheat cracks in the electroslag welded joints is reduced.

Keywords:

• electroslag welding and overmelting
• chemical activism of flux
• cracks through reheating
• structure and mechanical properties

Notes

^a. Author's certificate 3797697 (USSR)