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acid flux air-pressure burner already-soldered aluminum bench layout brass plate Bunsen burner clean cooled slowly dipping into water discoloration edge evenly excess solder Experienced solderers filing flame burner forearm four factors gas burner heating element held in place Hold bearing hot water inch brass Invar iron or flame iron's tip jigs and fixtures Judging heat knurled left hand lightly little solder lump mass-production soldering metals method molten solder muriatic acid novice operation oxide scale picking up solder pin holes pliers prevent proper properly heated quickly raw acid Reheat removed seam set screw short-cut shown in Figure solder and flux solder melted solder strand soldered joint soldered piece soldering fluxes soldering iron soldering tip stainless steel step suitable SUMMARY OF SECTION surfaces thick block thin plate tip is placed tools and equipment trick type of solder water brush wet rag wiped wire worker zinc chloride