Arc pilot daim hlau yog siv rau vuam seams. Nyob rau ntawm qhov chaw pib thiab qhov kawg ntawm qhov vuam taw tes, lub pob tw weld feem ntau raug txiav vim qhov vuam ntawm lub taub qab vuam, yog li cov hom pob tw vuam ntawm cov vuam muaj xws li ncaj ntug seam, unilateral V-shaped seam, ob sab V. -zoo li tus seam, U-shaped seam, K-shaped seam, X-shaped seam, thiab lwm yam.
