Welding is a process that joins two or more pieces of metal by melting them together using heat. This is often achieved with an electric arc or a gas flame, creating a strong bond as the molten metal cools and solidifies. Welding is commonly used in construction, manufacturing, and repair work. Soldering, on the other hand, involves joining metal parts using a filler metal, called solder, that melts at a lower temperature than the metals being joined. This technique is frequently used in electronics and plumbing to create electrical connections or seal pipes. Unlike welding, soldering does not melt the base metals, resulting in a weaker bond.