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A lock seamed tubular stainless-steel system of 1.75-in. by 4-in. framing and narrow stile doors was developed to meet accepted strength and design standards of commercial, industrial, and institutional architectural applications, and to produce the new system at much lower costs. Whereas all previous designs required supporting substructures of wood, carbon steel, or aluminum, and involved long hours of manual shop labor, the new Alumiline System was designed to be self-supporting and capable of being fabricated relatively quickly. The main tubular framing sections were designed to meet basic deflection standards of the Architectural Industry and were tested over an 11-ft span. The tubes performed very close to theoretical calculations. Cost comparisons were made between older methods of stainless-steel fabrication and the new Alumiline techniques. The new fabricating procedures reduced labor costs by 80 to 90 percent and permitted selling prices of assembled units to be reduced to less than half of previous levels.
stainless steels, tubes, deflection, tests, doors, roll forming, cutting, welding, punching, protective coatings, glazing, brake forming
President, The Alumiline Corp, Pawtucket, R.I.