põkkõmblus, kus liidetavate detailide servad moodustavad U-tähe kuju (vt põkkõmblus; vrd kaksik J-õmblus)
a type of butt weld: a U-groove weld forming a U shape on the top and bottom when components are together (see: butt weld/groove weld; compare: double J-butt weld)
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