Cracking metal question

[Jordan Baker]

im all good on fixing the cracks. I was just curious if they were caused by me when I removed the brazing from heating the metal to melt it?

As for the repeated pull on chain. It was just small brass chain holding some release knobs so there wasn't much weight on them.

These parts are the seat base riser used in the back of the Wire3.

[David Herbert]

Sorry Jordan that my post sounded a bit patronizing ! It wasn't intended to be.

I was visualizing a much heavier chain, like to limit the opening of a door. As it is such a light chain the cracking must have been caused by overheating the steel which then was not ductile enough to stretch back as it cooled and so had to crack. Whether it was done in the original production or by you I think is now very hard to tell.

David

[David Dunlop]

Hi Jordan.

Maybe the cracks are just the cumulative result of years of body weights moving around in the seats and road vibrations transferring up into the metal.

David

[Matthew P]

When originally brazed on somebody might have then taken a wet rag and rapidly chilled the metal so they could touch up the paint sooner? That could have caused cracks. Which might have gone unnoticed or ignored if there was a cause for a expediency and an attitude that they would still hold.

Just an idea?
Matt

[motto]

I watched a friend chase a crack around a car fuel tank one day whilst trying to do a brazing repair. The crack appeared to be caused by the brazing process and the job ended up very messy.
I saw it but I can't explain it.

David