Why do you need a height tempertaure to join two pieces of metal by welding?

A high temperature is essential for welding because it allows the metal to reach its melting point, enabling the edges of the two pieces to fuse together. This heat creates a molten pool that, when cooled, solidifies to form a strong bond. Additionally, sufficient heat helps to overcome any contaminants on the metal surfaces, ensuring a cleaner and more effective weld. Proper temperature control is crucial for achieving the desired mechanical properties and integrity of the welded joint.