Deck 5: Welding Processes and Efficiency

Question 1

What is the function of flux in submerged arc welding?

A)to completely cover the welded zone
B)to prevent oxidation of joint
C)to prevent spattering of molten metal
D)to prevent sticking of molten metal

Answer 1

to prevent sticking of molten metal

Question 2

If the heat transfer efficiency is 0.5 and the melting efficiency is 0.6, then the overall efficiency will be?

A)0.83
B)0.03
C)0.30
D)0.12

Answer 2

0.30

Question 3

The deflection of the arc in arc blow is by?

A)electric field
B)magnetic field
C)combination of both
D)hydrostatic field

Answer 3

magnetic field

Question 4

If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3.

A)1.4
B)14
C)1400
D)140

Question 5

Which of the following gas welding process uses constant voltage?

A)submerged arc welding
B)tungsten inert gas welding
C)stud welding
D)gas metal arc welding

Question 6

In order to prevent oxidation and retain molten metal in stud welding which of the following is used?

A)ceramic rings
B)metal rings
C)non-metal rings
D)flux

Question 7

Which of the following parameters control the quality of weld?

A)composition of electrode
B)size of electrode
C)size of metal plate
D)composition of metal plate

Question 8

Which of the following can be non-low hydrogen process?

A)shielded metal arc welding
B)submerged arc welding
C)gas-shielded metal arc welding
D)flux core arc welding

Question 9

Why hydrogen not used excessively for welding?

A)increases welding rate
B)decreases welding rate
C)destroys the metal plate
D)affects the weld

Question 10

Which of the following is true about shielded metal arc welding?

A)equipment cost is high
B)cannot weld different types of metals
C)cannot be used for metal sheets under 1.5mm thickness
D)entire electrode can be used

Question 11

Which of the following is not correct about submerged arc welding?

A)high deposition rate
B)short set-up time
C)high quality welds
D)slag removal needed

Question 12

Choose the correct option regarding metal- active gas welding?

A)not suitable for thin metal sheets
B)need to stop welding to change the consumed electrode
C)equipment is not expensive
D)high deposition rate

Question 13

What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes?

A)structure and chemical composition of electrode
B)structure and chemical composition of metal plate
C)time of welding
D)process of welding

Question 14

Which of the following is true about flux core arc welding?

A)low deposition rate
B)cannot weld narrow angles
C)slag removal required
D)generates less volume of fumes and smoke.

Question 15

Which of the following welding process is preferred for field application?

A)shielded metal arc welding
B)submerged arc welding
C)gas-shielded metal arc welding
D)flux core arc welding

Question 16

Which of the following is not correct about electro slag welding?

A)high deposition rates
B)welds flat or vertical joints only
C)multiple electrodes may not be used
D)complicated set-up

Question 17

Which of the following process does not have high deposition rate?

A)shielded metal arc welding
B)electro slag welding
C)gas-shielded metal arc welding
D)flux core arc welding

Question 18

Which of the following can be easily be welded from flash butt welding process?

A)tin
B)lead
C)cast irons
D)carbon steel

Question 19

Electrodes used in spot welding are made up of which material?

A)only copper
B)copper and tungsten
C)copper and chromium
D)copper and aluminium

Question 20

Which of the following method is not used in applying pressure in spot welding process?

A)hand lever
B)foot lever
C)air pressure
D)hydraulic cylinder

Question 21

What is the maximum power supply needed for the working of spot welding process?

A)135 kva
B)140 kva
C)145 kva
D)150 kva

Question 22

What is the minimum power supply needed for the working of spot welding process?

A)10 kva
B)14 kva
C)6 kva
D)22 kva

Question 23

Upset butt welding is majorly used in the making of automobile parts.

Question 24

In friction welding process, materials are joined by motion between materials.

A)rectilinear
B)rubbing
C)translatory
D)brownian

Question 25

All metallic engineering materials which are can be friction welded.

A)soft
B)weldable
C)forgeable
D)metamaterials