What types of grooves are most often used on pipe?

• A. V-groove, U groove, and J groove
• B. V-groove only
• C. U-groove and J groove only
• D. No groove

Answer: (A)

Edge preparation for pipe butt welds uses bevel grooves to give the weld metal a clear path and proper root opening for fusion. The three groove shapes most commonly used on pipe are V-groove, U-groove, and J-groove because they cover the range of wall thicknesses and welding conditions encountered in piping work. A V-groove is typical for thicker walls because its wide root opening makes full penetration more manageable. A U-groove provides a rounded root that can reduce edge preparation while still allowing a good root fusion. A J-groove mixes features to minimize material removal while ensuring proper root access. Together, these grooves are the standard choices for pipe welding because they balance penetration, fit-up, and welding efficiency. Using no groove isn’t practical for most pipe joints, as there wouldn’t be sufficient root access for a sound weld.