. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ved about fifty years later by JosephHall. The method employed is one of melting cast ironin a chamber or on the hearth of a reverberatory furnace,the flame passing over the molten metal. The requisitetime for this operation is about thirty minutes. Whenthe metal becomes melted, an oxidizing metal is phosphorus, sulphur, carbon, and other impuritiesmay be eliminated by stirring. During th
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ved about fifty years later by JosephHall. The method employed is one of melting cast ironin a chamber or on the hearth of a reverberatory furnace,the flame passing over the molten metal. The requisitetime for this operation is about thirty minutes. Whenthe metal becomes melted, an oxidizing metal is phosphorus, sulphur, carbon, and other impuritiesmay be eliminated by stirring. During the melting a slagforms and adjusts itself to the iron around each fiber,showing a fibrous rather than a crystalline are many varieties of furnaces of various capaci-ties; the capacity of the most common size ordinarilybeing from 500 lbs. to 1,500 lbs. THE ART OF HAND WELDING Some metals, when heated, become gradually softeras the temperature increases, until a heat is attained at HAND FORGING AND WELDING 385- which the metal is in such a condition that if two separatepieces are brought into contact by slight pressure, theywill adhere and form a single piece. Every metal is not. Figure 299.—Stationary Down-Draft Single Forge : 19 AdjustableHood ; 2, Stationary Hood ; 3, Front Plate ; Jf, Hearth ; 5, Fire Brick;6, Fire Pot; 7, Water Tank ; 8, Tool Rack ; 9, Adjusting Lever ; ; 11, Pinion ; 12, Base ; 13, Exhaust Pipe ; IJf, Tuyere Lever ;15, Blast Gate Lever ; 16, Coal Box. affected in this manner. Cast iron, for instance, does notbecome gradually softer as the heat is increased, butremains firm until a certain temperature is reachedand then softens suddenly and goes to- pieces. Any metalwhich softens gradually when heated, may be welded, S8G SHEET METAL WORKERS MANUAL while metals which act as cast iron does, can not bewelded. Welding Heat.—The condition at which pieces of metalare ready to adhere, is known as the welding heat. Thetwo pieces of meta
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