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Welding Knowledge Quiz

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

The main heat source in arc welding is:

a)

Chemical reaction

b)

Electrical resistance

c)

Electric arc

d)

Gas flame

2.

Which welding process uses a consumable coated electrode?

a)

TIG

b)

MIG

c)

SMAW

d)

SAW

3.

The coating on an electrode is called:

a)

Flux

b)

Slag

c)

Filler

d)

Core

4.

Which gas is commonly used for shielding in TIG welding?

a)

Oxygen

b)

Nitrogen

c)

Argon

d)

Hydrogen

5.

MIG welding is also known as:

a)

FCAW

b)

GMAW

c)

GTAW

d)

SAW

6.

The main function of flux is to:

a)

Increase arc voltage

b)

Prevent oxidation

c)

Increase weld speed

d)

Reduce current

7.

Which current is generally used for TIG welding of aluminum?

a)

DCEN

b)

DCEP

c)

AC

d)

Pulsed DC

8.

The heat affected zone (HAZ) is:

a)

Melted metal

b)

Base metal unaffected by heat

c)

Area adjacent to weld altered by heat

d)

Filler metal only

9.

Porosity in welds is caused by:

a)

Excess current

b)

Gas entrapment

c)

Poor edge preparation

d)

Slag inclusion

10.

Undercut is a defect that occurs:

a)

Inside the weld metal

b)

At the weld root

c)

Along the weld toe

d)

On the electrode

11.

Which welding position is the most difficult?

a)

Flat

b)

Horizontal

c)

Vertical

d)

Overhead

12.

Which metal is not normally welded by arc welding?

a)

Steel

b)

Aluminum

c)

Copper

d)

Mercury

13.

Slag inclusion occurs due to:

a)

High welding speed

b)

Improper cleaning between passes

c)

High voltage

d)

Short arc

14.

Which electrode is commonly used for mild steel welding?

a)

E6013

b)

E308

c)

E316

d)

ENi-CI

15.

The first two digits of electrode E6013 indicate:

a)

Welding position

b)

Coating type

c)

Tensile strength

d)

Current type

16.

NDT stands for:

a)

Non-Defect Testing

b)

Non-Destructive Testing

c)

Normal Defect Test

d)

Non-Directional Test

17.

Radiographic testing uses:

a)

Sound waves

b)

Magnetic field

c)

X-rays or gamma rays

d)

Liquid penetrant

18.

Magnetic particle testing is used for:

a)

Non-metals

b)

Ferrous materials

c)

Aluminum

d)

Plastics

19.

Excessive spatter is caused by:

a)

Low current

b)

Incorrect current and voltage

c)

Correct polarity

d)

Clean surface

20.

Which welding process is best for thick plates?

a)

TIG

b)

MIG

c)

SAW

d)

Gas welding

21.

Preheating before welding helps to:

a)

Increase hardness

b)

Reduce cracking

c)

Increase deposition

d)

Reduce slag

22.

Arc length is:

a)

Length of weld bead

b)

Distance between electrode and workpiece

c)

Length of electrode

d)

Length of cable

23.

Which defect reduces fatigue strength the most?

a)

Porosity

b)

Undercut

c)

Spatter

d)

Slag cover

24.

Oxy-acetylene welding uses:

a)

Oxygen + Hydrogen

b)

Oxygen + Acetylene

c)

Nitrogen + Acetylene

d)

Argon + Oxygen

25.

Welding helmet protects against:

a)

Heat only

b)

Smoke only

c)

UV and IR radiation

d)

Noise

26.

Which joint is strongest?

a)

Lap

b)

Butt

c)

Corner

d)

Edge

27.

Continuous wire electrode is used in:

a)

SMAW

b)

TIG

c)

MIG

d)

Gas welding

28.

Post-weld heat treatment is done to:

a)

Increase weld size

b)

Relieve residual stress

c)

Improve color

d)

Increase slag

29.

Aluminum oxide cleaning occurs in:

a)

DCEN

b)

DCEP

c)

AC TIG welding

d)

MIG welding

30.

Lack of fusion is caused by:

a)

Excess current

b)

Low heat input

c)

Correct technique

d)

Clean joint

31.

Unit of welding current is:

a)

Volt

b)

Watt

c)

Ampere

d)

Ohm

32.

Deeper penetration is achieved with:

a)

AC

b)

DCEN

c)

DCEP

d)

No polarity

33.

TIG welding uses which electrode?

a)

Carbon

b)

Mild steel

c)

Tungsten

d)

Aluminum

34.

Melting point of steel is approximately:

a)

500°C

b)

1000°C

c)

1370°C

d)

2000°C

35.

Cold cracking occurs:

a)

During welding

b)

After cooling

c)

Before welding

d)

During cutting

36.

Visual inspection is done:

a)

Before welding

b)

During welding

c)

After welding

d)

All of the above

37.

Highest deposition rate is achieved in:

a)

TIG

b)

MIG

c)

SAW

d)

Gas welding

38.

Normal electrode angle is:

a)

0°

b)

30°–45°

c)

70°–90°

d)

120°

39.

FCAW stands for:

a)

Flux Current Arc Welding

b)

Flux Cored Arc Welding

c)

Forced Current Arc Welding

d)

Fast Core Arc Welding

40.

Weld distortion occurs due to:

a)

High voltage

b)

Low current

c)

Uneven heating and cooling

d)

Wrong electrode

41.

Edge preparation is necessary in:

a)

Lap joint

b)

Butt joint

c)

Tee joint

d)

Corner joint

42.

Mandatory PPE for welding includes:

a)

Gloves

b)

Helmet

c)

Safety shoes

d)

All of the above

43.

Tack welding is done to:

a)

Finish the weld

b)

Hold parts in position

c)

Increase penetration

d)

Remove slag

44.

“E” in electrode classification stands for:

a)

Electric

b)

Electrode

c)

Energy

d)

Efficiency

45.

Acceptable defect within limits is:

a)

Crack

b)

Lack of fusion

c)

Porosity

d)

Burn through

46.

Welding fumes are dangerous because they:

a)

Reduce weld quality

b)

Damage equipment

c)

Are toxic when inhaled

d)

Increase slag

47.

Root penetration depends mainly on:

a)

Electrode angle

b)

Welding current

c)

Flux type

d)

Color of electrode

48.

SAW stands for:

a)

Shielded Arc Welding

b)

Submerged Arc Welding

c)

Super Arc Welding

d)

Special Arc Welding

49.

Which defect is not allowed in any weld?

a)

Porosity

b)

Undercut

c)

Crack

d)

Spatter

50.

Which welding process uses no flux?

a)

SMAW

b)

SAW

c)

FCAW

d)

TIG

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