What happens when we clamp glued joints?
When we clamp a joint while gluing it is generally stronger. However, there has been times when I glued without clamping and the joint was very strong - stronger than the wood. I've had the wood break instead of the glue joint even though the pieces weren't clamped.
So I'm asking what do you think happens during clamping that makes the joint stronger? Is it?
1) it makes better contact by lessening any gaps between the wood pieces.
2) Presses the glue deeper into the wood.
3) Removes as much excise glue as possible.
I think knowing the exact machinism that makes clamping joints stronger can lead to methods that make joints even stronger. For example, if its the deeper penetration of the glue that makes the joint stronger then we can try maximizing it by thinning out the glue to penetrate deeper or using a vacuum chamber to suck the glue deep into the wood.