HIGHER TECHNOLOGICAL INSTITUTETenth Of Ramadan CityMechanical

HIGHER TECHNOLOGICAL INSTITUTE
Tenth of Ramadan City
Mechanical Engineering Department
Term: Jan. I May (2008/2009)
Subject : Production Technology (B)
Time: 90 min.
Final Examination
B
Attempt the following questions:
Part A
"Machining Technology "(20 marks)

1) a- What arc the purposes of the cutting fluids? b- Explain with the aid of neat sketches the formation of built-up edge (BUE). What are the

disadvantages of these phenomena? c- List the advantages of hydraulic shaper comparing with the mechanical shaper.

2) a- What are the differences between the center and turret lathes? b -What is the meaning of the following characteristics of a grinding wheel:
C 70 H 7 B 24

c- It is required to turn a steel bar from 60 mm to 54 mm diameter for a length of 120 mm.
Calculate the machining time, if the cutting conditions are as follows:
The depth of cut is 1.5 mm, the feed rate is 0.3 mm/rev. and the cutting speed is 30 m/min.
(assume the approach and overtravel of the tool are 3 mm each)
Part B

"Welding Technology"

(20 marks)

1. a- Explain with the aid of a neat sketch the submerged arc welding (SAW) and then list the advantages of this method.

b- What is meant by; weldability? c- Calculate the preheating temperature required for a carbon steel joint of 6 mm thickness and its chemical composition is as follows:
C%
0.7

2.

Si%
0.2

Mn%
0.3

Cr%
0.6

P%
0.02

Mo%
0.4

a-Welded joints may be tested either destructively or nondestructively. What is the difference between the two methods? Explain with sketches The different types of, bending test. b-Explain how you can prevent the following welding defects: i- Incomplete penetration ii- Slag inclusion iii- Cracks c- Explain with the Sketches the-different types of oxyacetylene flames and then mention the uses of each of these flames.

Best wishes!

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