MANUFACTURING THE PERIPHERAL WALL OF A TANK FOR AN OIL-IMMERSED ELECTRIC APPARATUS

摘要

A method of manufacturing the peripheral wall of a tank for an oil-immersed electric apparatus which comprises manufacturing a panel unit through the steps of: fabricating a panel by pressing a thin steel sheet to form an upward extending flange along both edges of the panel and provide a plurality of reinforcement depressions concaved toward the backside of the flat portion of said panel; folding the panel into two parts with the surface of the panel kept outside along the central line extending between both edges of the panel to fabricate a hollow fin; joining both sides of the folded fin by spot welding the reinforcement depressions; and welding together the closely facing edges of both sides of the fin, and constructing the peripheral wall of the tank by joining together a plurality of panel units fabricated through the above-mentioned steps by welding the flanges of said panel units.