. 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 . adjunct to a weld-ing equipment, it is used for beveling and for cutting outpatches and holes. It also has many uses in destructiveand constructive work. The process is based on the fact that a jet of oxygendirected upon a previously heated spot of iron or steel,causes it to ignite, with the result that the metal, actingas its own fuel, burns away rapidly in the form of ironoxide. A special blowpip
. 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 . adjunct to a weld-ing equipment, it is used for beveling and for cutting outpatches and holes. It also has many uses in destructiveand constructive work. The process is based on the fact that a jet of oxygendirected upon a previously heated spot of iron or steel,causes it to ignite, with the result that the metal, actingas its own fuel, burns away rapidly in the form of ironoxide. A special blowpipe is provided for this work. OXY-ACETYLENE WELDING AND CUTTING 343 The oxygen cutting blowpipe cannot be used for weld-ing, any more than can the welding blowpipe be used forcutting. The same source of gas supply is used as for same acetylene regulator is used. The oxygen regulator for welding can be used forcutting on work up to V/2 inch in thickness. The cutting blowpipe is connected to the gas supplythrough the regulator in exactly the same way as thewelding blowpipe. Types of Blowpipe Used.—There are two kinds of oxy-acetylene cutting blowpipes, known as the central jet and. GUIDE WHEELCARRIAGE Figure 276.—Oxy-Acetylene Cutting Blowpipe (Central Jet Type) ;SA, 2B, IB, Internal Tips. following jet types. The central jet type has a numberof oxy-acetylene heating flames surrounding a centralhole, through which oxygen only passes. The followingjet type consists of one oxy-acetylene heating and oneoxygen jet. The holes for these jets are usually drilled inthe same tip, but sometimes have separate tips, which areset close together. Adjustment and Operation.—Figure 276 illustratesthe principles of operation of an oxy-acetylene cuttingblowpipe of central jet type. The oxygen and acetylene supplies are connected up 344 SHEET METAL WORKERS MANUAL through the regulators and rubber hose to the hosenipples on the blowpipe at V and M. To start work with the cutting blow
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