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Design of Butt Welds Butt / Groove welding Butt weld is used when the plates to be joined are in the same plane or when T joint is desired. Butt welding A butt weld is specified by the size of the weld. Size is defined by the effective throat thickness. Specification: 1. Size of the weld 2. Effective length of the butt weld 3. Effective area of the butt weld 4. Reinforcements 1. Size of the weld Size of the weld is specified by the effective throat thickness as follows: (a) The size of the butt weld is the thickness of th