A welded joint is a component or structure that connects two or more metal parts into a single unit through welding. Its main functions include:
1. Connection and Fixing: Connecting metal parts together makes the entire structure more robust and able to withstand certain loads and moments.
2. Heat Conduction: During high-temperature welding, the welded joint can conduct heat, ensuring uniform heating of the welded area and achieving the desired welding effect.
3. Sealing and Corrosion Protection: The welded joint can seal the weld, preventing gases, liquids, or other impurities from entering the interior of the connected components, thus achieving better corrosion protection.