The welding and bolt connection of the distribution box made by the distribution box manufacturer shall be firm, and the welding seam shall be uniform and smooth, without welding skin, welding penetration, air hole and other adverse phenomena; The bolt connection. The welding and bolt connection of the distribution box made by the distribution box manufacturer shall be firm, and the welding seam shall be uniform and smooth, without welding skin, welding penetration, air hole and other adverse phenomena; The bolt connection. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. In the manufacturing process of metal distribution boxes, welding constitutes a critical stage following sheet metal cutting and bending. Seasoned welders read the metal's "mood" - a hiss that's off-pitch or a color shift speaks volumes. Specializing in steel cutting, aluminum welding, and custom metalwork, we provide comprehensive solutions for industrial, commercial, and residential projects. Utilizing state-of-the-art. s products require boxes with rounded corners.