Boeing 747-400 fuselage welding porosity issue

This stuff can have a tensile strength of 300 ksi, which is as good as the best steels for aircraft landing gears. It can do that with 10% elongation and 50% reduction in area. There's no other material I've ever heard of that can give you that kind of ductility with that kind of strength. So among all metals this is way out there. The problem is, it gets its strength from cold work. You can make it into 2- or 3-inch bolts if you start with a 6-inch diameter rod, but you can't make it into plate. You can make it into wire. So it's fine for medical implants and little sheet things — little clips for the brain. And it's good for some high-strength bolts. I've heard of people using it on propellers, I haven't seen that myself. I've also heard that there are four MP35N bolts that hold the fuselage of the 747 to the wing of the 747.