Bolting Finish Painted Parts
Bolting Finish Painted Parts
(OP)
What is the industry rule of thumb for assembly of painted parts. Is prime to prime acceptable, e-coat to e-coat, what about prime and topcoat to prime and topcoat. And does anyone one have an opinion on Chemical Agent Resistant Coatings used in military applications. Is it acceptable to bolt a prime and CARC topcoated part to a prime and CARC topcoated vehicle frame?





RE: Bolting Finish Painted Parts
RE: Bolting Finish Painted Parts
RE: Bolting Finish Painted Parts
RE: Bolting Finish Painted Parts
RE: Bolting Finish Painted Parts
RE: Bolting Finish Painted Parts
"Low cycle high loading fatigue" can involve localized yielding each cycle. Are the fasteners of the material in the clamped zone stressed to yielding each cycle? Yikes. Is the coating in the high stress/strain areas for storage protection, or expected to survive "the events?"
RE: Bolting Finish Painted Parts
The potential for such cold-flow to affect fastener preload depends in part on the grip length of the fastener. For any given preload, a long bolt will stretch more than a short bolt, and thus will be more resistant to loss of preload due to embeddment than a short bolt.
Any text will provide you with a formula necessary to calculate the stretch of a bolt under preload. Finding accurate information on the amount of embeddment to expect from various coatings is more difficult.