MANUFACTURE OF TANK FOR OIL-FILLED ELECTRIC APPARATUS

摘要

PURPOSE:To manufacture a tank having good heat radiation effect with good workability by a method wherein a tank side plate is assembled by using panel elements having hollow fin sections formed by folding a steel plate into two. CONSTITUTION:A panel plate 10 having flange sections 13 at both sides by applying press working to a thin steel plate and having many recessed sections 12 at a flat plate section. The panel plate 10 is folded into two from the center line 0-0 and a hollow fin section 11a is formed. Next, spot welding is done by placing both side plates of the fin section 11a at the recessed sections 12 and seam welding is applied to both end edges 16 of both side plates to form a panel element 11. Many panel elements 11 formed in this way are connected by butt weld for the flange sections 13 and a tank side plate is assembled. This can manufacture a tank having the large heat radiation area of the tank side plate and having high heat-radiation effect with good workability.