Key principles.
Cold welding
Microscopic welds form between mating surfaces. Material transfer.
Total failure
Severe galling that locks parts together. Cannot disassemble.
Self-galling
Stainless-on-stainless particularly prone. Avoid pairing.
Avoid
Same alloy mating tends to gall. Use dissimilar alloys.
Recommended
One hard, one soft. Hardness difference reduces galling.
Critical
Active lubrication or self-lubricating surface treatment.
FAQ
Adhesive wear at sliding interface. Microscopic surface peaks weld together under load.
Avoid stainless-stainless. Use dissimilar (stainless + bronze, plated). Lubricate.
Hard chrome, nitriding, DLC, oxide coatings reduce galling. Phosphate plating for thread engagement.
Anti-seize compound on threads. Slow torque. Tight tolerances. Avoid back-and-forth motion.
Light galling: continue with anti-seize. Severe galling: replace mating parts. Don't reuse galled.
Aluminum bronze > silicon bronze > stainless 316 > stainless 304. Use bronze for stainless threads.
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