. 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 . Figure 278.—Oxy-Acetylene Welding in the Manufacture of MetalFurniture. A Typical Scene in a Large Shop, of metal, but the pressure of the oxygen supply will haveto be varied in each case. The figures quoted in the in-structions issued by the manufacturer should be followedclosely. It should be appreciated that the oxygen pres-sure has to be made sufficiently strong, so that it will blowaway the ir
. 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 . Figure 278.—Oxy-Acetylene Welding in the Manufacture of MetalFurniture. A Typical Scene in a Large Shop, of metal, but the pressure of the oxygen supply will haveto be varied in each case. The figures quoted in the in-structions issued by the manufacturer should be followedclosely. It should be appreciated that the oxygen pres-sure has to be made sufficiently strong, so that it will blowaway the iron oxide, insuring a clean, narrow cut beingmade through the metal. 346 SHEET METAL WORKERS MANUAL The Heating Flame.—The size of the heating flamemust be adjusted for each thickness of work to be cut. Itis impossible to give any hard and fast rule as to the size. Figure 279.—;Weldmg Outfit with Light Blowpipe in Operation. Thi*Outfit Is. Especially Used for Small Repeat Work at the Bench and forLead Burning. Note the Benrh Block, Where the First Regulation orAdjustment of the Welding Flame Is Made. of the flame. The operator must, if necessary, graduallyincrease the size of the heating flame, by opening theacetylene needle valve and heating oxygen needle valve OXY-ACETYLENE WELDING AND CUTTING 347 on the blowpipe, until the rate of cutting agrees withthe figures given in the Cutting Table furnished by themanufacturer of the blowpipe. Bear in mind, however,that these figures are intended for work on clean plates,and that when the work to be cut is rusty or covered withscale the rate of cutting will be considerably slower.
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