Deck 28: Filler Metal Selection

Question 1

____ is used as a deoxidizer and ferrite former.

A) Silicon
B) Chromium
C) Nickel
D) Molybdenum

Answer 1

A

Question 2

As the percentage of ____ increases, it can cause weld brittleness, reduced shock resistance, and increased cracking.

A) carbon
B) sulfur
C) phosphorus
D) manganese

Answer 2

C

Question 3

Which group has developed the most widely used numbering and lettering system for filler metal identification?

A) AWS
B) AISI
C) ASTM
D) ​NEMA

Answer 3

A

Question 4

____ indicates a composite electrode.

A) E
B) R
C) ER
D) EC

Question 5

In the identification system for mild steel FCAW electrodes, , for example E71T-2, the final number is used to indicate ____.

A) the minimum tensile strength of the deposited metal
B) the primary welding position for which the electrode is designed
C) that the filler metal can be used for single or multiple pass welds
D) a flux cored electrode

Question 6

____ indicates a rod that is heated by some other source other than electric current flowing directly through it.

A) R
B) B
C) RB
D) IN

Question 7

For fabricating structural and low alloy steels, the core wires of the electrode use ____.

A) high carbon steel
B) high nickel alloys
C) the approximate composition of the material to be welded
D) low carbon steel

Question 8

In the AWS specification for carbon steel-covered arc electrodes, a 1 to the right of the tensile strength indicates the following welding position(s): ____.

A) flat, horizontal, overhead, and vertical-down
B) all positions flat, horizontal, vertical, and overhead
C) flat only and is no longer used
D) horizontal fillets and flat

Question 9

As the percentage of ____ increases, the tensile strength increases, the hardness increases, and ductility is reduced.

A) carbon
B) sulfur
C) phosphorus
D) manganese

Question 10

In the AWS numbering system for carbon steel filler metal for GMAW, the last number indicates ____.

A) a cut length "roo" type electrode
B) solid wire
C) the minimum tensile strength of the deposited metal
D) the filler metal composition and the weld's mechanical properties

Question 11

____ is an austenite former.

A) Silicon
B) Chromium
C) Nickel
D) Molybdenum

Question 12

Which of the following is a function of the core wire?

A) To provide some of the alloying elements.
B) To provide an arc stabilizer.
C) To serve as an insulator.
D) To carry the welding current.

Question 13

____ indicates a brazing filler metal.

A) R
B) B
C) RB
D) IN

Question 14

In the AWS specification for carbon steel-covered arc electrodes, a 2 to the right of the tensile strength indicates the following welding position(s): ____.

A) flat, horizontal, overhead, and vertical-down
B) all positions flat, horizontal, vertical, and overhead
C) flat only and is no longer used
D) horizontal fillets and flat

Question 15

In the AWS specification for carbon steel-covered arc electrodes, a 4 to the right of the tensile strength indicates the following welding position(s): ____.

A) flat, horizontal, overhead, and vertical-down
B) all positions flat, horizontal, vertical, and overhead
C) flat only and is no longer used
D) horizontal fillets and flat

Question 16

As the percentage of ____ increases, tensile strength, toughness, and corrosion resistance increase.

A) silicon
B) chromium
C) nickel
D) molybdenum

Question 17

In the identification system for mild steel FCAW electrodes, the letter "T" in the fourth position indicates ____.

A) the minimum tensile strength of the deposited metal
B) the primary welding position for which the electrode is designed
C) usability and performance capabilities
D) a flux cored electrode

Question 18

____ indicates a filler metal that is supplied for use as either a current carrying electrode or in rod forms.

A) E
B) R
C) ER
D) EC

Question 19

____ indicates a filler metal that is used as a current carrying electrode, as a rod, or both.

A) R
B) B
C) RB
D) IN

Question 20

In the identification system for mild steel FCAW electrodes, the first number after the E indicates ____.

A) the minimum tensile strength of the deposited metal
B) the primary welding position for which the electrode is designed
C) usability and performance capabilities
D) a flux cored electrode

Question 21

​What's a major difference between E6010 and E6012 electrodes?

A) ​E6010 electrodes produce less penetrating welds.
B) ​E6010 electrodes generate less spatter.
C) ​E6012 electrodes generate less smoke and produce a thicker slag layer on the weld.
D) ​E6012 electrodes produce stronger welds.

Question 22

​As the percentage of carbon increases, ____ can cause hot shortness and porosity.

A) ​carbon
B) ​sulfur
C) ​phosphorus
D) ​manganese

Question 23

​Which of the following should be considered when choosing a welding electrode?

A) ​metal thickness
B) ​surface condition
C) ​welder's power range
D) ​All of the above

Question 24

The ____________________ is the impact load required to break a test piece of weld metal.

Question 25

____________________ is the percentage that a 2-inch piece of weld will stretch before it breaks.

Question 26

​Why should the temperature extremes a weld will be seeing in service be important to the selection of a filler metal for a weld?

A) ​Some welding electrodes produce more heat than is needed to make a weld if the metal is very cold.
B) ​Some metals become very brittle and crack easily at low temperatures.
C) ​Some arc welding electrodes will not hold an arc if the metal is too cold.
D) ​None of the above

Question 27

In the AWS specification for stainless steel-covered arc electrodes, following the prefix, the three-digit AISI stainless steel number is used to indicate ____.

A) the minimum tensile strength of the deposited metal
B) usability and performance capabilities
C) a flux cored electrode
D) the type of stainless steel in the filler metal

Question 28

​The melting point of magnesium is ____.

A) ​858°F
B) ​1202°F to 858°F below its boiling point
C) ​1300°F
D) ​858°F to 1202°F above its boiling point

Question 29

​Which of the following would not be a part of the technical data provided for an electrode?

A) ​Ability to weld on rust, oil, or paint
B) ​Number of inches of weld per welding electrode
C) ​Preheating and postheating temperatures
D) ​Cost per pound of electrodes

Question 30

​What characteristic of some fluxes can help to push the weld penetration deeper?

A) ​The larger mass of some bigger electrode flux coverings add a great deal of weight to the slag covering that force the weld penetration deeper.
B) ​Some fluxes act as a thermal blanket holding the heat into the weld which lets the weld penetrate deeper.
C) ​The formation of a crucible at the end of the electrode that acts as a combustion chamber.
D) ​The only way to get deeper weld penetration is to turn the welder's amperage to the maximum.

Question 31

​What is the significance of an alloy's CE number?

A) ​It is a listing of the alloying elements of a filler metal.
B) ​It is an indication of how the weld will affect the surrounding metal.
C) ​It relates to the Continued Evaluation of an alloy's properties.
D) ​It is a way of Classifying the Environmental impact an alloy has.

Question 32

​Which of the following is a function of the core wire?

A) ​To provide some of the alloying elements.
B) ​To provide an arc stabilizer.
C) ​To serve as an insulator.
D) ​To carry the welding current.

Question 33

The minimum ____________________ is the load in pounds that would be required to break a section of sound weld that has a cross-sectional area of one square inch.

Question 34

The AWS specifications for aluminum and aluminum alloy filler metals are ____ for covered arc welding electrodes.

A) A5.1
B) A5.3
C) A5.5
D) A5.10

Question 35

A(n) ____________________ value can be used to determine the weldability of an alloy.

Question 36

​Metal core arc welding electrodes are similar to what other type of electrodes?

A) ​FCAW
B) ​GMAW
C) ​GTAW
D) ​SMAW

Question 37

​____ act as scavengers that combine with contaminants and float to form the slag on top of the weld.

A) ​Carbon and nickel
B) ​Silicon and manganese
C) ​Aluminum and copper
D) ​Sulfur and magnesium

Question 38

In the AWS specification for stainless steel-covered arc electrodes, the letter "L" added to the right of the AISI number indicates ____.

A) a lime base coating
B) a low carbon stainless welding electrode
C) the electrode is a carbide former
D) the filler metals are stabilized to prevent chromium-carbide precipitation

Question 39

The ____________________ is the point in low and medium carbon steels at which the metal begins to stretch when force (stress) is applied after which it will not return to its original length.

Question 40

​Which electrode is sometimes referred to as being "Lo-Hi"?

A) ​E6010
B) ​E6011
C) ​E6012
D) ​E7018

Question 41

What are the functions of the flux covering?

Question 42

Explain what the ENi special-purpose electrodes are for.

Question 43

Describe the effect of shielded metal arc welding electrode selection on distortion.

Question 44

​The E6010 electrodes are designed to be used with _______ polarity.

Question 45

What type of information about an electrode is given by the manufacturer?

Question 46

The E6010 electrode contains ____________________, which decomposes into the hydrogen responsible for the deep electrode penetration so desirable in pipeline welding.

Question 47

​The AWS identification system for covered nonferrous electrodes is based on the ____________ or symbols of the major alloy(s) or the metal's identification number.

Question 48

Some high-temperature slags, called ____________________, solidify before the weld metal solidifies.

Question 49

Explain arc blow and when it occurs.

Question 50

____________________ gases prevent the atmosphere from contaminating the weld metal as it transfers across the arc gap.