40 Welding Interview Questions

40 Welding Interview Questions

 

40 Welding Interview Questions

40 Welding Interview Questions in Your Job Interview You can expand upon your most important skills for the job. skilled welder most important terms

SPOT Welding MCQ 1 to 40

1. Which of the following units are used to express heat input?
   1. Joules
   2. N/mm2
   3. J/mm2
   4. KJ/mm
2. Which of the following units are used to express current flow?
   1. Joules
   2. Amperes
   3. Ohms
   4. Seconds
3. Which of the following units are used to express electric resistance?
   1. Joules
   2. Amperes
   3. Ohms
   4. Seconds
4. Which of the following the welding process is used for weldingsheet metals in
   automobile and aircraft industries?

1. Shield metal arc welding
2. Gas tungsten arc welding
3. Thermit welding
4. Resistance welding

Which of the following the welding process is used for welding sheet metals in
automobile and aircraft industries?

1. Shield metal arc welding
2. Resistance welding
3. Gas tungsten arc welding
4. Gas metal arc welding

In what basic way does resistance welding differ from arc welding?

1. No arc is produced
2. No extra is added
3. Heat is produced by the resistance offered  by the workpiece
4. All of the above

The heat generated (H) in resistance welding is expressed by

1. I 2Rt
2. IR2t
3. IRt2
4. 2IRT

Which of the following is not a resistance welding?

1. Spot welding
2. Flash Butt welding
3. Projection welding
4. Thermit welding

The voltage needed in resistance welding does not depend upon

1. Composition
2. Area
3. Thickness of weld
4. Length of weld

In electric resistance welding…

1. Voltage is high & current is low
2. Voltage is low & current is high
3. Both voltage & current is high
4. Both voltage & current is low

In electric resistance welding, two copper electrodes used are cooled by…

1. Water
2. Air
3. Both A & B
4. None of the above

Electrodes used for spot welding are of many shapes & sizes, the most common is…

1. Beveled tip
2. Flat tip
3. Centre tip
4. None of the above

All spot welding machines have three basic components, which are these components?

Mechanism to apply pressure

Electrical transformer circuit

Timing system to control the duration of the flow of current

All of the above

The main disadvantage of spot welding is…

1. It leaves slight depression on the weld metal
2. It is not highly economical
3. Welding rate is low
4. Produces large heat affected zone

What type of resistance the welding process is used for attaching fasteners to structural
members?

1. Spot welding
2. Seam welding
3. Butt welding
4. Projection welding

When two pieces of different metals are to be welded by projection welding, then the
projection should be made on

1. Thinner metal piece
2. Thicker metal piece
3. On both the plates
4. None of these

When two pieces of different metals are to be welded by projection welding, then the
projection should be made on the metal piece with

1. Higher conductivity
2. Lower conductivity
3. Higher ductility
4. None of the above

Projection welding is a

Continuous spot welding process

Multi-spot welding process

Arc welding process

The process used for joining round bars

Seam welding is a

1. Continuous spot welding process
2. Multi-spot welding process
3. Arc welding process
4. Process used for joining round bars

In which of the following the resistance welding process, electrodes of two copper wheels
are used

1. Projection welding
2. Seam welding
3. Flash welding
4. Spot welding

What is a “Nugget “in resistance welding?

1. Fusion zone
2. Base metal
3. Pressure load
4. Current

Which metals are not possible to weld by projection welding?

1. Aluminium
2. Nickel alloys
3. Carbon see  l alloys
4. Copper & brass

In resistance welding, if the current is doubled, the heating effect becomes:

1. Double
   B) Four times
2. Eight times
3. Sixteen times

The important factors, which affects the quality of spot weld is…

1. Welding current
2. Electrode pressure
3. Duration of current flow
4. All of the above

Name the two resistance welding processes are shown in fig…

1. Spot welding & Seaming Welding
2. Projection Welding & Butt welding
3. Projection welding & seam welding
4. Seaming welding & flash butt welding

The main qualities a good spot welding electrode is

1. Highly strong
2. Wear-resistant
3. High electrical conductivity
4. All of the above

In spot welding, the size of the nugget is controlled by…

1. Time
2. Current
3. Pressure
4. Electrode contact area

Which is the following statement is true regarding spot welding?

1. It is also known as multi spot welding process
2. It can be produced by either a continuous or intermittent method of operation
3. It is not possible to obtain airtight welding
4. All of the above

In intermittent seam welding method, the electrode…

1. rotate at a constant speed
2. rotate for fixed angle
3. rotate at a high speed
4. rotate at a low speed

Which type of welding is suitable for square butt joint in thin section?

1. Spot welding
2. Butt seam welding
3. Projection welding
4. Upset welding

Welding of copper in spot welding is difficult because of it…

1. High ductility
2. High toughness
3. High electrical conductivity
4. High thermal conductivity

Hollow electrodes are used in spot welding because…

1. To reduce cost
2. To circulate water
3. To reduce weight
4. To reduce material resistance

Which type of resistance the welding machine is used for the continuous welding process?

1. Butt welding machine
2. Spot welding machine
3. Projection welding machine
4. Seam welding machine

Depends on what, current the setting is set in resistance spot welding?

1. Size of overlapping
2. Duration of current flow
3. Number of spots to be made
4. Thickness of sheet to be welded

The welding pressure in resistance welding increases than current and time must

1. Decreases
2. Increases
3. Remains same
4. None of the above

What is the maximum the temperature of weld zone in spot welding?

1. 750°C – 900°C
2. 900°C – 1200°C
3. 1500°C – 1700°C
4. 1800°C – 2100°C

Welding time in resistance welding depends upon

1. Rate of pressure
2. Rate of heat generation/dissipation
3. Rate of temperature
4. All of the above

In projection welding, the depth of projection is about:

1. 20% of sheet thickness
2. 40% of sheet thickness
3. 60% of sheet thickness
4. 80% of sheet thickness

In spot welding, the tip diameter of the electrode is about…

1. √t
2. √2t
3. 2√t
4. √3t

In spot welding, the spacing between two spot welds is…

a)4t

b) 8t

c) 12t

16t

In spot welding, two electrodes are made of

1. Aluminum
2. Copper
3. Iron
4. Bronze

A seam weld can be produced by…

1. Continuous method of operation
2. Intermittent method of operation
3. either continuous or intermittent method of operation
4. none of the above