If the leads of the package can handle it then the solder joint certainly should.
The leads look awfully thin for a maximum 40A load current the TRIAC can handle. But I am guessing this is because the leads are rather short?
I would lay down wide PCB traces and cover them with solder, all the way from the triac to the 10 AWG wire connector. That should handle 30A
Yeah, that's what I've been thinking as well. I guess I will have to test how that handles the load...
If I were going for a more flexible option, I'd need some sort of connectors that could handle this kind of load though... any thoughts other than using wiring nuts?