Abstract：Oscillated electron beam welding with cosmetic welding was applied to 5mm AF1410 steel. Microstructural
features and tensile failure fractures of joints were examined by means of OM, SEM and microhardness tester. Results
showed that the heat affected zone (HAZ) contains light etched zone and dark etched zone, which are composed of martensite
(M), M+ reverted austenite (Ar) respectively; the weld zone (WZ) is divided into 3 different zones, namely remelted
zone, normalized zone and tempered zone, and occupied by columnar grains, besides martensite exists in intragranular areas
and retained austenite (A) exists at intergranular areas. After post-weld heat treatment, microhardness and microstructure of
joint are nearly the same as base metal. The room tensile strength of joint reaches 98% of base metal and all cracks initiate
at HAZ and propagate through the whole WZ in60° direction.
2017, 
