Galling Information?
Galling Information?
(OP)
I need to learn about galling particularly of threaded fasteners. I have seen most of what has been written in Eng-Tips.Com in regard to galling of stainless and aluminum, but how can I predict the circumstances when galling will occur with alloy steel fasteners? For any given alloy, is there a torque value or tooth stress beyond which galling can be expected? What causes galling??? Is galling ever a danger with press fit assemblies? All advice or referrals welcome.
Thanks in advance
tc7
Thanks in advance
tc7





RE: Galling Information?
Maui
RE: Galling Information?
That helps me get an idea of the phenomenon, but when you mention "welding" occurs, I can't relate to this happening without extremely high (melting point) tempertures occurring. Could you explain the type of welding that is taking place? Thanks for your time.
tc7
RE: Galling Information?
Anyhow, cold welding can also be done by hammering gold (no surface oxide) or lead (the interface gets broken up, and the oxide gets dispersed into the matrix). This also happens with some explosive and ultrasonic bonding processes. The trick with most metals is in getting rid of the tenacious oxide film.
Re press fits: Galling is not a problem if the assembly is meant to be permanent!
Hope this helps,
Ken