Abstract: A full penetration weld joint for connecting adjacent end portions of two members wherein one end portion has an inner lip extending therefrom and the other end portion fits over and laps the lip. Opposed end surfaces of the members are inclined outwardly in divergent relation from the lip and the end surfaces are spaced slightly forming a gap therebetween. In the end portion having the lip a generally U-shaped groove extends inwardly within the lip and substantially beneath the adjacent inclined end surface. The U-shaped groove is angularly oriented relative to the longitudinal axis of the lip and is positioned adjacent the gap which is formed between closely spaced flat portions on the end surfaces.