Deck 28: Filler Metal Selection

Question 1

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

Answer 1

B

Question 2

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

Answer 2

D

Question 3

____ indicates a brazing filler metal.

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

Answer 3

B

Question 4

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 5

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 6

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 7

____ 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 8

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 9

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

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

Question 10

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 11

____ 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 12

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 13

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

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

Question 14

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

A) AWS
B) AISI
C) ASTM
D) NEMA

Question 15

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 16

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 17

____ is an austenite former.

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

Question 18

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 19

____ 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 20

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 21

Explain what the ENi special-purpose electrodes are for.

Question 22

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

Question 23

Explain arc blow and when it occurs.

Question 24

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 25

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

Question 26

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

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

Question 27

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

A) FCAW
B) GMAW
C) GTAW
D) SMAW

Question 28

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 29

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

Question 30

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

Question 31

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 32

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

Question 33

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

Question 34

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 1 square inch.

Question 35

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 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 36

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

Question 37

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

Question 38

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 39

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

Question 40

What are the functions of the flux covering?