New York Low Pressure Boiler COF Practice

What type of welding is required for pipes that are 2 inches or more in diameter?

1. Fillet weld

2. Butt weld

3. Tack weld

4. Spot weld

The correct answer is: Butt weld

Butt welds are primarily used for joining two pieces of pipe together, especially when the pipes are 2 inches or more in diameter. This type of weld creates a strong joint by aligning the edges of the pipes and welding them together, allowing for a continuous flow through the pipe without significant restrictions or turbulence that might occur with other welding methods. Butt welds provide strength and are ideal for high-pressure applications, which is often a requirement for larger diameter pipes used in various systems. In contrast, fillet welds are more suitable for joining two surfaces at a right angle, such as in structural applications, and may not provide the same continuity and strength as butt welds for pipe joints. Tack welds are temporary and used to hold materials in place before final welding, making them inadequate for permanent pipe connections. Spot welds are used for joining metal sheets together at specific points and are not suitable for pipes. Hence, the requirement for strong, continuous joints in larger pipelines justifies the use of butt welding.