What is the practical difference between welding and brazing?

What is the practical difference between welding and brazing?

• A. Brazing fuses base metals by melting them.
• B. Welding fuses base metals by melting them; brazing joins with a filler metal that melts but does not melt the base metals.
• C. Welding uses a filler metal that does not melt the base metals.
• D. Brazing melts base metals to join them.

Answer: (C)

The main idea is whether the base metals are melted to form the joint. Welding fuses the base metals by melting them (and often adding a filler metal that also melts) to create a fusion as it cools. Brazing, in contrast, uses a filler metal that melts and flows into the joint, while the base metals themselves stay solid. The bond comes from the filler metal joining to the surfaces as it cools. This difference explains why brazed joints typically involve less heat input and less distortion, and why they’re often used to join dissimilar metals, whereas welded joints rely on melting the actual metals to achieve fusion.

The main idea is whether the base metals are melted to form the joint. Welding fuses the base metals by melting them (and often adding a filler metal that also melts) to create a fusion as it cools. Brazing, in contrast, uses a filler metal that melts and flows into the joint, while the base metals themselves stay solid. The bond comes from the filler metal joining to the surfaces as it cools. This difference explains why brazed joints typically involve less heat input and less distortion, and why they’re often used to join dissimilar metals, whereas welded joints rely on melting the actual metals to achieve fusion.