Investigation of Thermal-Deformation State of Welded Joints in Stable-Austenitic Steels and Nickel Alloys

Abstract

Peculiarities of variations in values of current and residual stresses and strains in welded joints on austenitic steels with a yield point of about 350 MPa and on high-strength alloys with σ_0.2 ~ 800 MPa were studied. Evaluation of the stress-strain state in the HAZ and weld metal allows the causes of formation of hot and probably cold cracks to be explained, and methods for controlling them on the basis of absolute values of residual stresses and on the basis of variations in properties (including sensitivity to cracking) to be substantiated. The diagram of current quantitative values of σ_res. Иδ_res versus time for metal with the austenitic structure and different strength level was plotted in situ for the first time.