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Q9. Write short note on the followings –

A. Metal – locking;

B.TIG and MIG welding;

C. Brazing;

D. Soldering.

Q9. Sketch suitable welded joints indicating approximate plate thickness and dimensions of preparation for the following purposes: -

a) End plate connection to shell of an unfired pressure vessel. (6)

b) Longitudinal seam of a high pressure compressed air bottle. (5)

c)Describe any faults in workmanship, which might weaken the finished products. (5)

Q7. With reference to electric arc welding:

a) Draw a labeled sectional sketch of a satisfactory butt weld. (5)

b) Briefly define the following defects that may occur and how they may have been caused (6)

i) Under cut

ii) Splatter

iii) Inclusion

iv) Blow hole

v) Incomplete root penetration

vi) Lack of fusion

c) Why is alternating current generally more popular then direct current for metal arc welding? (5)

Q5. a) Describe types of arc welding processes. (8)

b) Describe what level of temperatures are reached during arc welding. (4)

c) Describe precautions taken to avoid health and shock hazards during welding. (4)

Q2. Describe safety precautions with gas cutting/welding equipments.

a) For storage of gas cylinders. (8)

b) Transportation on ship for working. (4)

c) During gas cutting & welding operation. (4)

Q3. a) Describe types of welds made in arc welding process and their use. (4)

b) Describe various type of welding defects in welding operation. Discuss the causes of these defects. (6)

c) Discuss types of distortions found in welding operations. Discuss the causes and correction methods. (6)

Q1. a) Describe principle of arc welding, with diagrams. (6)

b) Describe equipment used in arc welding. (6)

c) Describe health hazards and precautions to be taken. (4)

Q6. a) What is the principle of gas cutting? (4)

b) Describe how gas cutting is carried out with Oxygen and Acetylene flame? (8)

c) State the pressure levels for Acetylene & Oxy cylinders for gas cutting operations. (4)

Q1) With reference to electric arc welding:

(a) Draw a labelled sectional sketch of a satisfactory butt weld (8)

(b) Discuss the advantages and disadvantages of using alternating current and direct current in this type of welding (8)