Not forward enough on the header pipe for an abrasion hole, looks liked a grinder or some sorta chemical. Doesn't really matter. I'd try the JB weld, if headers are off car you can push JB weld into the header pipe and flatten it on both sides, akin to a rivet. Then smooth it down prior to final hardening. JB weld is rated for 600*f but I don't know if the heating/cooling cycles will effect it.

Good luck!