How can we solder two stainless steel rods material- Stainless steel 304 or SS316
OD-6mm ID-1.6mm Depth-4mm
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solder generally will not work on stainless steel (it can't stick because of the oxide that forms on the surface of the steel). You can weld it instead, using welding wire or rod specifically compounded to work with stainless. If the join between the two parts is threaded, you can lock them together using a type of glue called thread locker which is effective yet allows the parts to be torqued apart at some later time if necessary.