LOADING RATE EFFECT ON FRACTURE RESISTANCEOF HSLA STEEL WELDED JOINTS

摘要

Three testing methods of different loading rates (impact test, explosion bulge test and fracture mechanics tests) had beenrnapplied for fracture behaviour evaluation of base metal and welded joints, produced by metal manual arc welding.Basicrnproperties of weldments and transition temperatures (50% Charpy impact energy and nil ductility drop weight test temperature)rnwere assessed too as a part of weldability testing.The results, obtained for base metal, weld metal and heat-affected-zone arernanalyzed.rnThe results of application of given methods to Yugoslav version of HY 100 type steel and SUMITEN 80P, produced in Japan,rnare presented.This enabled to assess the effect of loading rate on fracture resistance of welded joint of these high strengthrnlow alloyed steels for pressure vessel application.rnIt was concluded that applied testing methods do not exclude each other, since they produce complementary results, helpingrnto understand better fracture behaviour of welded joints as an important part of global weldability assessment.