Fusion Welding

In fusion welding, you locally melt the metal so that the workpieces join. On cooling, a solid, continuous structure forms again. Make sure you don't melt too briefly or too long. Too brief and the weld doesn't bind properly, there are cold spots or cracks. Too long and the structure becomes coarse, the weld becomes brittle and loses toughness. Control this via heat input and travel speed. If you guide the melt calmly and evenly and don't cool the weld too quickly, you get a clean result.