Abstract
AISI 430 ferritic stainless steel joints were fabricated using ER308L austenitic filler metal via cold metal transfer welding technique. The weld metal consisted of ferrite and austenite, and the heat affected zone (HAZ) can be divided into coarse and fine grain zones. The precipitation of carbides, the formation of martensites at ferrite grain boundaries (intergranular martensites) and the growth of ferrite grains occurred in the coarse grain zone of HAZ. The content of intergranular martensite and precipitated carbide increases with the increase of heat input. The microhardness values increased from the weld metal to the coarse grain zone of HAZ, and decreased significantly in the fine grain zone. The increase of microhardness value from the weld metal to the coarse grain zone of HAZ is mainly due to the formation of a large amount of intergranular martensite and intragranular carbides. The microhardness of the base metal was lower than that of weld metal and HAZ. The welded joints showed good tensile properties and the fracture was located at the base metal for all samples. The fracture surface with uniformly distributed dimples indicated the typical ductile fracture feature.
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