New York Low Pressure Boiler COF Practice 2025 - Free Practice Questions and Study Guide

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What type of welding is required for joining a 4" pipe?

Socket weld

Butt weld

Butt welding is typically required for joining a 4" pipe because it creates a strong and seamless joint by aligning the edges of the pipes to be joined directly against one another. This method is highly effective for pipes of this size as it allows for the full thickness of the pipe wall to contribute to the strength of the joint, which is particularly important under pressure conditions.

Butt welds are also favored in high-pressure applications because they result in a smooth internal surface. This reduces turbulence, minimizes the risk of corrosion, and ensures a consistent flow for any fluids within the pipe. The integrity of the weld can be more easily inspected and tested, making it suitable for various applications, especially in industrial settings where reliability is crucial.

Other types of welding, while they may serve specific purposes or applications, do not offer the same level of strength and compatibility as butt welding does for standard pipe joining.

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Tee weld

Lap weld

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