NCCER Welding Level 1 Module 2: Oxyfuel Cutting

NCCER Welding Level 1 Module 2: Oxyfuel Cutting 1. What types of metals contain iron? - Ferrous metals are those that contain iron. 2. In what situation is oxyfuel cutting most effectively used? - Oxyfuel cutting is particularly well-suited for cutting ferrous metals. 3. What happens to metal when subjected to a high-pressure stream of cutting oxygen from an oxyfuel torch? - The metal is instantly oxidized. 4. What is the recommended tinting range for face shields or safety glasses during oxyfuel cutting operations? - The tinting should be within the range of 3-6. 5. During what activities do most welding-related fires occur? - Most welding environment fires occur during oxyfuel gas welding or cutting. 6. What is the safest method for preparing a tank or vessel that may have contained flammable substances before cutting it with an oxyfuel torch? - The best approach is to fill it with water or a purge gas. 7. What results from the combination of pure oxygen and a fuel gas? - It produces a high-pressure jet of cutting oxygen. 8. What is the most common oxygen cylinder size used in oxyfuel cutting applications? - The typical size is 227 cubic feet. 9. If an acetylene cylinder is found lying on its side, what should you do before using it? - You should stand the cylinder upright and wait at least one hour. 10. What is the maximum hourly rate at which acetylene gas can be drawn from a cylinder? - It should not exceed 1/7 of the cylinder's capacity. 11. Which fuel gas burns at the lowest temperature? - Propane is the fuel gas that burns with the lowest flame temperature. 12. In gas pressure regulators, what do the two gauges indicate? - One gauge shows the cylinder pressure (upstream), while the other indicates the pressure of the gas leaving the cylinder (downstream). 13. What type of fittings are characterized by left-hand threads and a V-notch in the nut? - These fittings are most likely fuel gas fittings for oxyfuel cutting equipment. 14. What is the name of the cutting torch that utilizes a vacuum created by low-pressure oxygen flow? - This type of torch is known as the injector torch. 15. What creates sparks in a friction lighter? - A friction lighter produces sparks when a steel surface is rubbed with flint. 16. What category does a computer-controlled plate cutting machine fall under? - It is an example of motor-driven equipment. 17. What is the purpose of cracking cylinder valves during the setup of oxyfuel equipment? - This practice serves to remove dirt from the valves. 18. Before opening cylinder valves, what should be checked regarding oxygen and fuel gas regulators? - Ensure that the adjusting screws on both regulators are closed. 19. Which formula is commonly used for leak testing oxyfuel cutting equipment? - A leak testing formula that produces bubbles if a leak is present. 20. What is the term for an oxyfuel cutting flame with an excess of fuel? - This is referred to as a carburizing flame. 21. When disassembling oxyfuel equipment, what should all pressure gauges indicate? - All pressure gauges should read 0. 22. Why should gas cylinders never be fully empty? - This is due to the risk of reverse flow. 23. When examining cut edges made by oxyfuel equipment, how should the drag lines appear? - The drag lines should be vertical and not very pronounced. 24. What is a significant concern when cutting thin steel with an oxyfuel torch? - A major concern is distortion of the material. 25. What is the cutting method called for removing bolts, rivets, and other projections? - This process is known as washing. 26. What component of an oxyfuel track burner allows for vertical positioning of the torch? - The torch holder fulfills this function. 27. What sound indicates that a torch flame was extinguished due to backfire? - A loud snap or pop occurs, referred to as backfire. 28. What flame has the appropriate balance of fuel gas and oxygen? - This is known as a neutral flame. 29. How is an oxidizing flame characterized? - An oxidizing flame has an excess of oxygen. 30. What does it mean to pierce in the context of oxyfuel cutting? - To pierce means to penetrate through a metal plate using an oxyfuel cutting torc