Grade 420 Stainless Steels are welded utilizing welding rod, coated with grade 420 metals, to accomplish high-strength joints. During the process, steels are pre-heated at 150 to 320°C and post-heated to 610 to 760°C. In the "as welded" condition, parts are welded utilizing grade 309 filler rods to accomplish ductile joints. Anyway, grade 309 electrodes or rod is recommended for welding Grade 420 steels by AS 1554.6.
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