leak paths due to excessive inclusion level
leak paths due to excessive inclusion level
(OP)
I'm looking for references/information on the impact of non-metallic inclusions on maintaining a hermetic seal. We recently began developing very small leaks in steel fittings (1018)...they are detected after assembly during a helium leak check....post bubble chamber testing shows very slow leaks directly through the fitting. The only difference I note over time appears to be an increase in the density of MnS inclusions. This problem seems to cut across several part numbers from several suppliers. Am I barking up the right tree in thinking that we may need to specify a cleaner steel (lower sulfur) ?? This problem seems to be recent and has me wondering about the steel bar quality in general.
Thanks
Mark
Thanks
Mark





RE: leak paths due to excessive inclusion level
I have see this in stainless also. A company had made straight pattern valves for years and they passed He leak testing. One day his long time customer asked for a few angle pattern valves and they all failed. They leaked parallel to the center line of the bar.
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Plymouth Tube
RE: leak paths due to excessive inclusion level