single U-butt weld, single-U-butt weld, single U-groove weld
U- tähe kujulise servavahemikuga põkkõmblus (vt põkkõmblus), a groove weld/butt weld in which the joint edge of both members is prepared in the form of a J from one side, giving a final U form to the completed weld (see: groove weld/butt weld)
