Carbon and Alloy Steels and Alloy Steel Filler

Question 1

What is the carbon content range of low carbon steels?
a) 0.05% to 0.30%
b) 0.30% to 0.45%
c) 0.45% to 0.75%
d) 0.75% to 1.50%

Answer 1

a) 0.05% to 0.30%

Question 2

Punches and dies are made from what class of carbon steel?
a) low
b) medium
c) high
d) very high

Answer 2

d) very high

Question 3

What is the carbon content range of high carbon steels?
a) 0.05% to 0.30%
b) 0.30% to 0.45%
c) 0.45% to 0.75%
d) 0.75% to 1.50%

Answer 3

c) 0.45% to 0.75%

Question 4

Axles and connecting rods are made from ___________carbon steel.

Answer 4

4. Axles and connecting rods are made from __medium___carbon steel.

Question 5

What is the carbon content range of very high carbon steels?
a) 0.05% to 0.30%
b) 0.30% to 0.45%
c) 0.45% to 0.75%
d) 0.75% to 1.50%

Answer 5

d) 0.75% to 1.50%

Question 6

Structural shapes are made from ________carbon steel.

Answer 6

Structural shapes are made from ___low___carbon steel.

Question 7

What is the carbon content range of medium carbon steel?
a) 0.05% to 0.30%
b) 0.30% to 0.45%
c) 0.45% to 0.75%
d) 0.75% to 1.50%

Answer 7

b) 0.30% to 0.45%

Question 8

Leaf springs used on automobiles are made from ___________________carbon steel.

Answer 8

Leaf springs used on automobiles are made from ___High__carbon steel.

Question 9

In the SAE or AISI number 1025, the number 25 indicates the:
a) tensile strength of the material.
b) percentage of alloy added.
c) carbon content in hundredths of 1%.
d) sulphur content of the steel.

Answer 9

c) carbon content in hundredths of 1%.

Question 10

The SAE and AISI use the same numbering system for what type(s) of steel products?
a) automobile frames
b) sheet steel
c) structural steel plates and shapes
d) steel bars

Answer 10

d) steel bars

Question 11

Which governing body writes specifications for structural steel shapes and plates?
a) ASTM
b) ASME
c) AWS
d) AISI

Answer 11

a) ASTM

Question 12

What is indicated by the first digit in the SAE or AISI numbering system?
a) tensile strength
b) class of steel
c) carbon content
d) percentage purity in hundredths of 1%

Answer 12

b) class of steel

Question 13

Which two organizations work closely together in issuing steel specifications for the fabrication of boilers and pressure vessels?
a) SAE and AISI
b) ASTM and AISI
c) ASTM and ASME
d) ASTM and SAE

Answer 13

c) ASTM and ASME

Question 14

What is the principal hardening agent in steel?
a) tungsten
b) manganese
c) boron
d) carbon

Answer 14

d) carbon

Question 15

Why is preheat necessary in the welding of most high carbon steels?
a) to speed up the cooling rate
b) to slow down the cooling rate
c) to draw out impurities
d) allows the use of AC current

Answer 15

b) to slow down the cooling rate

Question 16

Which class of steel is generally tough, ductile, easily formed and usually welded
without preheat?
a) low carbon
b) medium carbon
c) high carbon
d) very high carbon

Answer 16

a) low carbon

Question 17

Which elements exist in small quantities in carbon steels and are usually considered
impurities?
a) iron, carbon, manganese
b) silicon, sulphur, manganese
c) phosphorus, silicon, manganese
d) sulphur, phosphorus

Answer 17

d) sulphur, phosphorus

Question 18

Which element in carbon steels, in percentages up to about 0.80%, is intended to combine with sulphur to offset embrittlement and hot shortness?
a) phosphorus
b) silicon
c) manganese
d) carbon

Answer 18

c) manganese

Question 19

In high percentages, this element is considered an impurity. In low percentages up to approximately 0.01%, it slightly improves the strength and corrosion resistance of
low carbon steel.
a) phosphorus
b) sulphur
c) silicon
d) manganese

Answer 19

a) phosphorus

Question 20

The content of this element in carbon steel is usually kept below 0.05%, but a content of 0.1% to 0.15% can improve its machinability.
a) manganese
b) sulphur
c) phosphorus
d) silicon

Answer 20

b) sulphur

Question 21

Which element increases the strength and toughness of steel at low temperatures?
a) nickel
b) chromium
c) tungsten
d) molybdenum

Answer 21

a) nickel

Question 22

What is the purpose of having a chromium content of 10% to 30% in steel?
a) increases corrosion resistance
b) gives the steel a shiny finish
c) increases hardness at high temperatures
d) improves toughness at low temperatures

Answer 22

a) increases corrosion resistance

Question 23

Which element is used to decrease high temperature creep (slow stretching of steel under stress at high temperatures)?
a) cobalt
b) manganese
c) molybdenum
d) silicon

Answer 23

c) molybdenum

Question 24

What is the alloying element in carbon steel that tends to produce a fine grain structure during the heat-treating process?
a) tungsten
b) titanium
c) chromium
d) vanadium

Answer 24

d) vanadium

Question 25

Why is tungsten alloyed with tool steels? a) to retain hardness at high temperatures b) to remove excess carbon from the steel c) to reduce hardness of the tool steel d) to increase strength at low temperatures

Answer 25

a) to retain hardness at high temperatures

Question 26

Which element, in percentages of 1% to 15%, increases the toughness and hardenability of steel? a) magnesium b) manganese c) molybdenum d) mercury

Answer 26

b) manganese

Question 27

Why are small amounts of nickel, chromium or molybdenum added to low alloy steels? a) to decrease tensile strength and hardenability b) so electrode selection is not so restricted c) welding procedures do not have to be controlled d) to increase strength, hardness and toughness

Answer 27

d) to increase strength, hardness and toughness

Question 28

What is one advantage of using low alloy steels? a) A wider selection of electrodes is available. b) They increase the weight and thickness of welded structures. c) They improve resistance to heat and corrosion. d) Welding procedures are less strict.

Answer 28

c) They improve resistance to heat and corrosion.

Question 29

Which steels are designed to provide improved strength, corrosion resistance or notch toughness while retaining good weldability? a) SMAW b) ASTM c) ASME d) HSLA

Answer 29

d) HSLA

Question 30

What is one characteristic of high strength low alloy steels? a) They have a higher strength-to-weight ratio than carbon steels. b) They have a lower strength-to-weight ratio than carbon steels. c) HSLA steels do not require any preheat prior to welding. d) They cannot be welded using GMAW, FCAW or SAW.

Answer 30

a) They have a higher strength-to-weight ratio than carbon steels.

Question 31

How are the mechanical properties of low alloy SMAW electrodes improved over low carbon electrodes? a) by adding alloying elements to the coating b) by adding alloying elements to the core wire only c) by restricting their use to reverse polarity only d) by using high heats and making large weld deposits

Answer 31

a) by adding alloying elements to the coating

Question 32

The slag of an E10018 is similar to the slag of which electrode? a) E6010 b) E7014 c) E7018 d) E7024

Answer 32

c) E7018

Question 33

What is the major ingredient in the coating of an E9018? a) cellulose b) lime c) iron oxide d) titanium dioxide

Answer 33

b) lime

Question 34

In the AWS classification system for low alloy electrodes, what identifies the specific additions for alloys? a) the last two digits b) the first three digits c) the prefixes d) the suffixes

Answer 34

d) the suffixes

Question 35

What do the suffixes such as A1, B4 or C3 refer to in low alloy electrodes? a) the welding positions recommended b) the tensile strength of the core wire c) the chemical composition of the core wire d) the specific additions of alloying elements

Answer 35

d) the specific additions of alloying elements

Question 36

The suffix A1 indicates what specific alloy has been added to the coating? a) molybdenum b) chromium c) nickel d) manganese

Answer 36

a) molybdenum

Question 37

If a SMAW alloy electrode contains nickel as the major alloy addition in the coating, which letter would be in the suffix? a) A b) B c) C d) D

Answer 37

c) C

Question 38

What type of material is E8018-B2L suitable for? a) low alloy steels containing 0.50% to 1.25% chromium, 0.50% molybdenum b) 300 series (austenitic) stainless steels c) nickel alloys for cryogenic service applications d) high manganese steels

Answer 38

a) low alloy steels containing 0.50% to 1.25% chromium, 0.50% molybdenum