what if on Instagram: "Engineers can fuse metal without a single flame by using a technology called friction welding, one of the coolest breakthroughs in modern manufacturing. Instead of melting metal with fire, it uses pure mechanical energy. When two metal pieces are pressed together and spun or rubbed at extreme speed, the friction generates intense localized heat. But here’s the twist: the metal never fully melts. It softens just enough for its molecules to bond. That means the joint becomes