SURFACE REPAIRS BY MMAW AND MIG - INFLUENCES ON FRACTURE ENERGY

The aim of this study was to determine which weld repairing method of cavitation/erosion damage of stainless steels would ensure a good toughness. Sets of specific specimens were obtained and manual metal arc and metal inert gas weld repaired and tested by Charpy pendulum impact tests. Additional hardness measurements were performed on the weld metal and heat affected zone. A finite element analysis was performed on a simplified model to find stress distribution in an assembly with various characteristics. Main influence factor on the toughness was welding heat input by altering the microstructure of the heat affected zone.