Why do I need to use Type 309 or 310 filler metal when welding the 300 series stainless steel to carbon steel?
Carbon steel is a ferritic alloy, while the 300 series stainless steels are austenitic. In making a weld, small quantities of each base metal are melted and contribute to the weld. (In the case where no filler metal is used autogenous welding, the weld will have 50% ferrite and 50% austenite, which can result in a brittle structure of mixed phases i.e. martensite and ferrite). Adding a fully austenitic , overmatching welding product, such as 309 or 310, which may constitute 50% of the molten weld pool while smaller percentages are supplied from the base metals being welded, the resulting weld chemistry will remain predominantly austenitic, with a smaller varying quantity of ferrite. Each dissimilar weld combination should be evaluated on their own merit to determine the best selection of filler materials and acceptable levels of ferrite in the final weld. back to main menu 4. What is TIG and MIG welding? The acronyms stand for tungsten inert gas (TIG) welding and metal inert gas (MIG)
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