Introduction to Basic Manufacturing Processes and ... - always yours

Welding 345
7. What effect does welding have on the grain-size of a metal? What effect will pre-heating have
on the microstructure of the weld-area in high carbon steel? Show it with the help of neat
diagram.
8. Sketch a gas welding set-up.
9. How is gas welding performed? How is the flame adjusted?
10. Sketch the three types of gas welding flames and give differences between them.
11. Give the advantages, limitations and applications of gas welding?
12. Describe gas welding techniques in detail?
13. Write short notes on :
(i) Welding rods
(ii) Fluxes
(iii) Gas flames
(iv) Working of pressure regulators
(v) Working pressure of gases in H.P and L.P welding and cutting.
14. What procedure and care will you follow in operating?
(i) A low pressure plant
(ii) A high pressure plant.
15. How will you obtain neutral, oxidizing and reducing flames using welding torch in gas
welding?
16. What are the main requirements of a good flux used in gas welding?
17. What is a gas welding rod?
18. Give the complete procedure of gas welding.
19. Compare high pressure and low pressure gas welding
20. Sketch an oxygen cylinder. How does it differ from acetylene cylinder?
21. How will you generate and store acetylene gas?
22. Sketch a single stage pressure reduction regulator and explain its working.
23. Write short notes on the following:
(i) Hoses
(ii) Torch tip
(iii) Welding torch and its parts
(iv) Welding goggles
(v) Wire brush
(vi) Filler rod in gas welding
24. Describe the method of oxy-acetylene cutting.
25. Define electric arc welding. Discuss with the help of neat sketch, the principle of arc welding.
What is straight polarity and reverse polarity?
26. Give a list of equipments required in general for electric arc welding.
27. Explain the principle of arc-welding.
28. What do you understand by the term polarity?
29. What is the advantage of having different polarities?
30. Compare the merits and demerits of using A.C and D.C for arc welding.