What thickness should the weld be when using welded fittings to join pipe?

What thickness should the weld be when using welded fittings to join pipe?

• A. Twice the pipe wall thickness
• B. Equal to the pipe wall thickness
• C. Half the pipe wall thickness
• D. Weld thickness is not specified

Answer: (B)

Welding a pipe joint is intended to restore the strength of the pipe wall at the connection. When using welded fittings to join pipe, the weld must have a thickness that matches the pipe wall so the joint carries the same load as the pipe itself. If the weld is thinner, it becomes the weak point and can fail under internal pressure before the pipe wall does. If it’s thicker, the extra weld adds little real strength but can cause unnecessary distortion, misfit, or issues with clearance. Matching the pipe wall thickness for the weld ensures the joint has equivalent strength and keeps the system’s pressure rating intact.

Welding a pipe joint is intended to restore the strength of the pipe wall at the connection. When using welded fittings to join pipe, the weld must have a thickness that matches the pipe wall so the joint carries the same load as the pipe itself. If the weld is thinner, it becomes the weak point and can fail under internal pressure before the pipe wall does. If it’s thicker, the extra weld adds little real strength but can cause unnecessary distortion, misfit, or issues with clearance. Matching the pipe wall thickness for the weld ensures the joint has equivalent strength and keeps the system’s pressure rating intact.