Properties of welded joints between low-alloyed and high-alloyed steel

Abstract

Mechanical properties of welded joints made of high-strength low-alloy and high-alloyed austenitic steels mainly depend on the properties of the filler material used for their welding. Basic guidelines for selection of filler materials for such welds are provided by the Sheffler diagram. However, these guidelines are mainly oriented towards the avoidance of hot crack occurrence in the aforementioned joints. Due to this and more often than not, insufficient attention is devoted to micro- structural differences, and the resulting mechanical properties of welded joint regions. These differences can have a much higher influence on the behaviour of such welded joints during exploitation, when compared to hot cracks. This paper presents the results of testing of two welded joints. One of them was welded using a filler material whose purpose is to prevent hot cracks from occurring, and the other was used in order to obtain the optimal relationship between the mechanical properties of individual weld regions.