Re: Another rivet question


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Posted by Jeff on Friday, April 06, 2001 at 7:36PM :

In Reply to: Another rivet question posted by ROB ROSE on Thursday, April 05, 2001 at 9:06AM :

A steel rivet is soft steel, about the same grade as a grade 2 bolt. When used as a fastener it is put in the hole first then heated. In heavy industry induction heaters are used today instead of torches. An induction heater can heat a rivet red hot in about 5 seconds. It's the same heater as an induction bearing heater, only with a smaller loop. The heat helps the rivet fill the rivet hole as completely as possible. The heat also helps prevent cracking the rivet. And the other purpose is to expand the metal so that when the rivet cools there is a clampload on the joint. Hot riveting was done on automobile frames, cold riveting was done on automobile body parts and mechanical parts. Hot riveting on frames was replaced by welding, which today is being replaced by hydroforming, a process where crossmembers are pressed into place on the main frame rails with 30,000psi water.

As far as heat treating, I am familiar with the process of heat treating and cooling steel to obtain different hardnesses on the Rockwell hardness scale, but can't think of an application for a steel rivet that has been heat treated.

I thought on some aircraft applications the aluminum skin was heated and attached hot so it would shrink onto the frame. Thought this was the same principle of getting a tighter fit by thermal contraction?



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