NCCER Welding Level 1 Module 2 Oxyfuel Cutting questions and answers

ferrous metals What use is oxyfuel cutting best suited for? oxidize The stream of high pressure cutting oxygen that is directed from an oxyfuel torch causes to metal to instantly _____? 3-6 The recommended range of tinting for either the face shield or the safety glass lenses used during an oxyfuel cutting operation is ______? Oxyfuel gas welding or cutting Most welding environment fires occur during _____? Fill it with water or a purge gas When preparing a tank or vessel that might have contained flammable materials to be cut with an oxyfuel cutting torch, the best approach is to ______? A high pressure jet of cutting oxygen When pure oxygen is combined with a fuel gas, it produces a ______? 227 cubic feet The most common size of oxygen cylinder used in oxyfuel cutting applications is ______? Stand the cylinder upright and wait at least one hour If an acetylene cylinder is found lying on its side, what should be done before it is used? 1/7 of the cylinder's capacity The maximum hourly rate at which acetylene gas can be withdrawn from a cylinder is _____? Propane The fuel gas that burns with the lowest flame temperature is _______. The pressure of the gas leaving the cylinder (downstream) Most gas pressure regulators contain two gauges- one that indicates the cylinder pressure (upstream), and one that indicates the ______? Fuel gas fittings Oxyfuel cutting equipment that has left hand threads and a V-notch in the nut are most likely to be ______? The injector torch The type of cutting torch that uses a vacuum created by oxygen flow from a very low pressure source is ______. Flint A friction lighter produces sparks when it's steel surface is rubbed with a piece of ______. Motor driven equipment A computer-controlled plate cutting machine and an optical pattern-tracing machine are examples of _______. Removing dirt from the valves Cracking the cylinder valves during the set-up of oxyfuel equipment is a way of _______? Closed Before opening cylinder valves, verify that the adjusting screws on the oxygen and fuel gas regulators have been _______. Leak testing formula, which produces bubbles if a leak is present Oxyfuel cutting equipment is typically leak tested using _____? Carburizing flame An oxyfuel cutting flame that has an excess of fuel is called a _______. Reading 0 When disassembling oxyfuel equipment, verify that all pressure gauges are _______. Reverse flow Gas cylinders should never be completely empty because of the risk of ______. Vertical and not very pronounced When a cut has been made with oxyfuel cutting equipment, the drag lines of the cut should be close to _______. Distortion A major concern when cutting thin steel with an oxyfuel cutting torch is ______. Washing An oxyfuel cutting process that is often used for cutting off bolts, rivets, and other projections is called _______. The torch holder What part of an oxyfuel track burner allows the vertical positioning of the torch to be controlled? Backfire A loud snap or pop as a torch flame is extinguished Carburizing flame A flame burning with an excess amount of fuel; also called a reducing flame. Drag lines The lines on the edge of the material that result from the travel of the cutting oxygen stream into, through, and out of the metal Dross The material (oxidized and molten metal) that is expelled from the kerf when cutting using a thermal process. It is sometimes called slag Ferrous metals metals containing iron Flashback The flame burning back into the tip, torch, hose, or regulator, causing a high pitched whistling or hissing sound Gouging The process of cutting a groove into a surface