4G WELDING
Welding is the process of joining two or more materials together using heat, pressure, or both to create a permanent bond. The materials being joined are called the "parent materials," and the material added to create the joint is called the "filler" or "consumable". The final product is called the "welded joint" or "weldment".
Welding can be used to join metals, plastics, and sometimes wood. It's a versatile process that can be used for a variety of applications, from small DIY projects to large-scale manufacturing.
Here are some key aspects of welding:
- The heat source for welding is usually an electric arc, flame, pressure, or friction. The arc is a high-current, low-voltage discharge that's typically 10–2,000 amperes at 10–50 volts.
- A filler metal is often melted into the weld seam using a wire feeder or manual-feed welding electrode. The filler metal should have a similar melting point to the materials being welded.
- There are two types of welds: homogeneous, where the filler is similar to the parent materials, and heterogeneous, where the filler is dissimilar.
- There are many different welding processes, including arc welding, TIG welding, and plasma arc welding.
The term "weld" comes from the Middle English verb well or welling, which means "to heat" or "to bring to a boil".
