What type of weld joint is primarily used for connecting two pipes at a right angle?

• A. Butt joint
• B. Lap joint
• C. Tee joint
• D. Fillet joint

Answer: (C)

The type of weld joint primarily used for connecting two pipes at a right angle is the tee joint. This joint configuration allows for one pipe to be attached to another at a perpendicular angle, resembling the shape of the letter 'T.' Tee joints are essential in pipefitting as they facilitate the connection of a branch line to a main line, enabling the flow of fluids or gases in multiple directions from the main pipeline.

When a tee joint is utilized, it provides structural integrity and proper alignment for the connected pipes, ensuring that they can handle the stresses imposed during operation. The welding process for tee joints typically involves using fillet welds along the edges of the intersecting pipes, making it crucial for achieving a secure and leak-free connection.

Other types of joints, such as butt joints and lap joints, do not serve the purpose of connecting pipes at right angles as effectively as the tee joint. Butt joints are used for aligning two pipe ends flush with each other, while lap joints involve overlapping sections of material, which are not suitable for perpendicular connections.