IP 3rd Year

Question 1

With an increase in the heat input of the SMAW method, how does it affect the welding speed?

Answer 1

Decreases

Question 2

With an increase in the heat input of the SMAW method, how does it affect the voltage applied?

Answer 2

Increases

Question 3

With an increase in the heat input of arc welding method, how does it affect the required current?

Answer 3

No relation

Question 4

Which property is responsible for weld metal cracking?

Answer 4

Stress

Question 5

Which type of fuel gas is commonly used in gas welding?

Answer 5

Acetylene

Question 6

Acetylene is a hydrocarbon which molecule is made up of two carbon atoms and four hydrogen atoms. True or False?

Answer 6

False

Question 7

A welding torch is mainly used for mixing and burning the gases in the desired proportions. True or False?

Answer 7

True

Question 8

The distance from the center of arc to the tip of electrode is called what?

Answer 8

Arc length

Question 9

Which type of electrode is designed for melting quickly?

Answer 9

Fast freeze

Question 10

Which material is not used for making non-consumable electrodes?

Answer 10

Sodium

Question 11

Which characteristic does not define a coated electrode?

Answer 11

Maintenance of arc

Question 12

Which gas is used as a protection in SMAW?

Answer 12

Carbon dioxide

Question 13

What is the most common number of preheat cones used in a number 3 cutting torch tip?

Answer 13

6

Question 14

What is the recommended oxygen pressure for a number 1 torch tip?

Answer 14

30 psi

Question 15

Are cast irons best cut using the oxy-fuel cutting process?

Answer 15

False

Question 16

Can the oxygen cutting process be used with the melting point higher than their oxidization temperature?

Answer 16

True

Question 17

Which method cannot be used for welding carbon steel?

Answer 17

Gray welding

Question 18

Which method is best suited for stainless steels?

Answer 18

GTAW

Question 19

Which of the following is not a material used for making an electrode in SMAW for welding stainless steels?

Answer 19

Carbon

Question 20

The parameter which has no effect on cold cracking of a shielded metal arc weld is?

Answer 20

Cleaning of the job

Question 21

Weld decay during austenitic stainless steel welding cannot be minimized by?

Answer 21

Use low carbon variety

Question 22

Select the false statement: The welding heat input during shielded metal arc welding does not depend on?

Answer 22

Employing low current level

Question 23

True or False: A double vee groove weld produces more distortion compared to a single vee groove.

Answer 23

False

Question 24

True or False: The material operating at high temperature suffers corrosion and oxidation.

Answer 24

False

Question 25

True or False: The brittle fracture takes some time for propagation.

Answer 25

False

Question 26

True or False: A welding procedure for carbon steel cannot be used for low alloy steel.

Answer 26

False

Question 27

True or False: For square wave AC, there is no need for a high frequency unit for re-ignition of the arc.

Answer 27

False

Question 28

True or False: Thoriated tungsten electrode is suitable for both DC and AC.

Answer 28

False

Question 29

The quality of an arc stud weld is not dependent on?

Answer 29

The flow rate of shielding gas

Question 30

What does the penetration during tungsten inert gas welding not depend on?

Answer 30

The arc.

Question 31

How is arc stability achieved in AC welding using shielded metal arc welding?

Answer 31

Addition of potassium to the flux coating.

Question 32

What can superior mechanical properties in shielded metal arc welding be obtained by?

Answer 32

None of the above (cellulose, rutile or copper coating).

Question 33

Why is baking of a lime coated electrode in shielded metal arc welding carried out?

Answer 33

The moisture in the electrode coating can be removed.

Question 34

What type of electrode produces a violent arc with deep penetration and fast freeze in the base metal?

Answer 34

Cellulose coated electrode.

Question 35

What is the position of the pipe axis when welding a pipe in the 5G position?

Answer 35

The pipe axis is horizontal and welding is done around the circumference.

Question 36

What is the deposit of weld metal required for a double vee groove weld compared to a single vee groove weld?

Answer 36

Lower than that in the case of single vee groove weld.

Question 37

Apart from hydrogen content, what factors are responsible for cold cracking?

Answer 37

Weld metal hardness and joint restraint levels.

Question 38

What is hot cracking of the weld metal due to?

Answer 38

Improper preheating.

Question 39

What defect is expected to occur when very high current is used during the root pass with the GTAW process?

Answer 39

Undercut.

Question 40

What happens when an austenitic stainless steel weld is cooled rapidly?

Answer 40

None of the above.

Question 41

What causes brittle fracture of carbon steel?

Answer 41

Very low operating temperature, stress raisers and shock loading.

Question 42

In a pipe containing a longitudinal weld and circumferential weld, which weld experiences higher stress?

Answer 42

Longitudinal weld experiences higher stress than circumferential weld.

Question 43

What decides the effectiveness of post weld heat treatment of a weldment?

Answer 43

None of the above

Question 44

What happens when a constant current characteristic power source is used?

Answer 44

The current change is equal to the change in arc voltage

Question 45

What is the flow rate of shielding gas during tungsten inert gas welding?

Answer 45

More for helium than argon since helium is a very light gas compared to argon

Question 46

How does arc stability during AC welding of tungsten inert gas welding compare?

Answer 46

Worse with conventional wave AC than with square wave AC current

Question 47

How is re-ignition achieved in square wave AC welding during tungsten inert gas welding?

Answer 47

By the use of a high voltage high frequency power

Question 48

What is the purpose of adding a ferrule in arc stud welding process?

Answer 48

To restrict the entry of atmospheric gases and to shape the weld

Question 49

What does a 60% duty cycle of a shielded metal arc welding power source mean?

Answer 49

The power source can be operated for 60% time and the balance time must be for cooling the power source

Question 50

What is cold cracking of a carbon steel weld mainly due to?

Answer 50

Hydrogen which dissolves in the liquid weld metal

Question 51

What is the purpose of preheating the job before welding?

Answer 51

To reduce the rate of cooling of the weld metal

Question 52

How does the toughness of austenitic stainless steel compare to that of carbon steel?

Answer 52

Very low compared to that of carbon steel

Question 53

What is the purpose of a penetrant test on the weldment?

Answer 53

To determine surface defects

Question 54

What is the major limitation of tungsten inert gas welding?

Answer 54

The deposition rates are less

Question 55

What happens when the current level in tungsten inert gas welding is much lower than the recommended value?

Answer 55

The arc stability will not be good.

Question 56

During tungsten inert gas welding using AC power, what should the tungsten electrode tip do?

Answer 56

Become a ball for better arc stability.

Question 57

How can the quality of the stud weld be assessed?

Answer 57

Destructive test.

Question 58

What are shielding gases used for in welding?

Answer 58

To protect the molten metal from brittleness.

Question 59

What must a welder pass to be considered qualified?

Answer 59

WPQR.

Question 60

What is the carbon content percentage range for medium carbon steel?

Answer 60

0.4% to 0.6%.

Question 61

Which type of stainless steel is magnetic?

Answer 61

410.

Question 62

What is meant by the term dilution in welding?

Answer 62

The mixing of filler metal with the parent metal.

Question 63

What is one method used to prevent carbide precipitation?

Answer 63

Maintain a short arc length so as not to burn out the chromium.

Question 64

Which series of chromium steels (4% to 6% chromium) are not classified as stainless steels?

Answer 64

500 series.

Question 65

In type 300 series stainless steels, what does the suffix B denote?

Answer 65

Silicone.

Question 66

What temperature range is it possible to get carbide precipitation?

Answer 66

800-1500°F.

Question 67

In what positions can you do surface welding with GTAW on aluminum?

Answer 67

All positions.

Question 68

Compared to low carbon steel, does stainless steel have a lower coefficient of thermal expansion?

Answer 68

False.

Question 69

What does the sugaring effect on stainless steel welds indicate?

Answer 69

Oxidation due to lack of shielding.

Question 70

How much distortion due to thermal expansion occurs during the welding of stainless steel compared to mild steel?

Answer 70

50% more.

Question 71

What is the recommended torch angle for a single pass 2F weld?

Answer 71

45° to the vertical and horizontal planes.

Question 72

How are wrought aluminum alloys visually identified?

Answer 72

By rolling marks and smooth finish.

Question 73

What is the purpose of a flowmeter when used with GTAW?

Answer 73

To meter the flow of shielding gas.

Question 74

When is pulsing the arc with GTAW advantageous?

Answer 74

When penetration on thin metals must be controlled.

Question 75

What causes tungsten inclusions in the weld zone?

Answer 75

Exceeding the current limit of the electrode.