What are two common methods of joining metal pipes?

• A. Welding and glue
• B. Welding and soldering
• C. Welding and brazing
• D. Welding and clamping

Answer: (C)

Welding and brazing are two widely recognized and effective methods for joining metal pipes. Welding involves the process of melting the base metal and allowing it to cool to form a strong joint. This method is commonly used in pipefitting as it creates a structural bond that can withstand high pressures and temperatures, making it ideal for various industrial applications.

Brazing, on the other hand, utilizes a filler metal that has a lower melting point than the workpieces being joined. The base metals do not melt; instead, the filler metal is heated and flows into the joint by capillary action. This technique is advantageous for joining dissimilar metals and allows for strong connections without the need for extensive surface preparation.

The combination of welding and brazing provides the versatility needed for different applications in metal pipe joining, ensuring strong and reliable connections for various systems.