When you're talking about the consequences of welding ductile iron, you say hardening, but the actual problem is increased brittleness, yes? Ductility is lost, and it becomes more prone to crack?
That is correct, I don't remember all the technical details, but it has to do with the carbon getting converted into a different form than its at to begin with. It's not just that it gets more brittle though, because of temperature differentials throughout the weld bead and in the base metal it introduces enormous stress into it as it cools and because it's no longer ductile it can't stretch.
Actually, what I just said isn't quite entirely accurate, it does become radically harder as well. So much so that carbide tooling will hardly even touch it.
Great to see and hear some details of your thought process. Looking forward to some more videos. Have a great weekend sir
Thank you, you as well.
When you're talking about the consequences of welding ductile iron, you say hardening, but the actual problem is increased brittleness, yes? Ductility is lost, and it becomes more prone to crack?
That is correct, I don't remember all the technical details, but it has to do with the carbon getting converted into a different form than its at to begin with. It's not just that it gets more brittle though, because of temperature differentials throughout the weld bead and in the base metal it introduces enormous stress into it as it cools and because it's no longer ductile it can't stretch.
Actually, what I just said isn't quite entirely accurate, it does become radically harder as well. So much so that carbide tooling will hardly even touch it.
Need to slow the speed down
@perpetualmotion1 how did you determine that it was ductile iron? Just from breaking the welds on the fixture?