Oxy-acetylene welding a) List the essential differences between brazing and fusion welding. b) With.

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May 14, 2022

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Oxy-acetylene welding a) List the essential differences between brazing and fusion welding. b) With the aid of diagrams explain the essential differences between oxy-acetylene welding and manual metal-arc welding. c) With the aid of sketches describe how oxygen and acetylene cylinders can be identified, and name the safety feature that prevents the welding equipment being connected to the wrong cylinder. d) List the advantages and limitations of a welding gas manifold system compared with individual cylinders at each work station. e) Explain the purpose of the pressure regulators that have to

»Oxy-acetylene welding a) List the essential differences between brazing and fusion welding. b) With the aid of diagrams explain the essential differences between oxy-acetylene welding and manual metal-arc welding. c) With the aid of sketches describe how oxygen and acetylene cylinders can be identified, and name the safety feature that prevents the welding equipment being connected to the wrong cylinder. d) List the advantages and limitations of a welding gas manifold system compared with individual cylinders at each work station. e) Explain the purpose of the pressure regulators that have to be mounted on the cylinders. i) Explain why such regulators have two pressure gauges. ii) Describe the correct procedure to be followed when mounting a regulator on a cylinder. f) Describe the requirements of welding hoses, how they can be identified and the purpose of a hose protector and a flash-back arrestor. g) With the aid of sketches describe the essential features of an oxy-acetylene welding torch. h) With the aid of sketches explain the difference between a reducing flame, an oxidizing flame and a neutral flame, indicating the hottest part of the flame. State which flame is usually used for welding plain carbon steels. i) With the aid of sketches describe what is meant by ‘ leftward ’ and ‘ rightward ’ welding and list their relative advantages and limitations. j) With the aid of sketches describe the differences between flanged-edge welding, square butt welding and vee-butt welding. Under what circumstances would these techniques be used? k) Discuss the problems associated with oxidation in welded joints, paying particular attention to the difficulties that will occur in the welding process and the effect on the strength of the weld.

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