True or False: Groove weld size and effective throat size for a partial joint penetration groove weld must be included in a welding symbol.

True or False: Groove weld size and effective throat size for a partial joint penetration groove weld must be included in a welding symbol.

• A. True
• B. False
• C. Not specified
• D. Depends

Answer: (A)

Groove weld symbols carry two essential measurements when the joint is a partial penetration weld: the size of the weld to be deposited and the effective throat size, which is the actual load-carrying portion of the weld. In a partial joint penetration (PJP) groove weld, the weld does not fuse through the full thickness, so the throat through which shear and tensile stresses act is smaller than the plate thickness. To prevent ambiguity and ensure the weld meets both fabrication and design requirements, the symbol must specify both the overall weld size and the effective throat size. That way the welder knows exactly how much material to deposit and the exact depth that will carry the load, and inspectors can verify the correct penetration and strength.

Groove weld symbols carry two essential measurements when the joint is a partial penetration weld: the size of the weld to be deposited and the effective throat size, which is the actual load-carrying portion of the weld. In a partial joint penetration (PJP) groove weld, the weld does not fuse through the full thickness, so the throat through which shear and tensile stresses act is smaller than the plate thickness. To prevent ambiguity and ensure the weld meets both fabrication and design requirements, the symbol must specify both the overall weld size and the effective throat size. That way the welder knows exactly how much material to deposit and the exact depth that will carry the load, and inspectors can verify the correct penetration and strength.