Welding

If the electrode freezes to the work:

Turn the welding machine off immediately

The proper length of arc may be judged by:

The sound of the arc.
The appearance of the arc.
The appearance of the weld.
All of the above. Correct

If the electrode is moved too fast when arc welding:

Not enough metal will be deposited.

Which of the following is not a recognized welding position?

Diagonal

Flux is a chemical compound used to prevent the:

Formation of an oxide on the metal.

Straight polarity is when:

Work is positive and the electrode is negative.

A second pass should never be done if:

The slag from the first pass has not been removed

The tensile strength of an E-7018 electrode is _______ pounds psi.

70,000

Porosity describes the condition of:

Gas pockets and voids in the metal.

Mild steel is considered to have:

medium carbon content

The duty cycle of an arc welder refers to the:

Continuous operating time in a ten minute period.

Which element in steel is most undesirable for welding?

Sulfur

Which of the following is considered a fast freeze, deep penetrating, all purpose electrode?

E-6011

A T-fillet weld is affected most by _______ distortion.

Angular

What element is added more than others to iron in the manufacturing of steel?

Carbon

What shade of lens is used in arc welding?

Ten

Which two welds are known as "fillet" welds?

T-weld and lap weld

What is the first bead made when welding two pieces of metal together called?

Root pass

An electrical current that flows in one direction (+) for a half cycle and then in the other direction (-) for a half cycle is:

Alternating current (AC)

For most arc welding jobs, the length of the arc should be:

Equal to the rod width.

What is the purpose of the coating on an electrode?

Prevent impurities from entering the weld.

What is the work angle?

The angle between the electrode and the base metal when viewed from the end plane.

When welding pieces that are of unequal thickness:

Point the electrode towards the thicker piece.

What does the term "weld metal" refer to when arc welding?

The fused portion of base metal with filler rod.

An E-7014 electrode can be used in:

a. The flat position only
b. Flat and vertical positions only
c. All positions.

When welding vertical up, you should have:

Short arc

When selecting an electrode for a welding job it is best to:

Choose a rod that is made of metal which is as similar to the metal as possible.

Ductility refers to:

The ability of a metal to be stretched.

Malleability refers to:

The ability of a metal to be hammered or rolled.

The heat energy across an arc is produced by the:

Resistance to current flow across the arc.

The slag which remains on top of the weld will _______ the speed that the weld cools.

Slow

A _______ is any material which allows electricity to flow through it.

Conductor

The two methods of striking an arc are:

Scratching and tapping.

Electrodes are classified by the

American Welding Society

What kind of hammer should be used to remove slag?

Chipping hammer

Beveling is often used on very _______ metals.

Thick

Arc blow is caused by:

magnetic forces

To stop arc blow from occurring you should:

Turn off the machine, remove the ground clamp momentarily
then clamp it back on.

What is the correct arc length when welding in the flat position?

The width of the uncoated end of the electrode.

A chill plate is used to:

Absorb excessive heat from the welding process

The output of a welding machine is relatively:

Low voltage and high amperage

Placing a small weld at each end of a joint is called:

Tack welding

Eye hazards found in welding operations include:

a. Flyingparticles
b. Radiation
c. Smoke and fumes
D. All OF THE ABOVE

Protective equipment not suitable for eye protection from welding radiation includes:

Clear safety goggles

Which of the following gases can be used as shielding gases for GMAW?

a. Carbondioxide
b. Argon-oxygen
c. Argon
D. ALL OF THE ABOVE

In a completed weld, the term for the junction between the weld face and the base metal is:

Toe

Endurance limit is an expression used for what type of testing?

Fatigue

The ability of a metal to absorb energy is called:

toughness

Which alloying element is generally considered to have the most pronounced effect on the properties and performance of carbon steel?

Carbon

Which alloying element is commonly added to steel to improve its corrosion resistance?

Chromium

Hydrogen in the molten weld metal can cause:

Porosity

The point at which a metal's behavior changes from elastic to plastic (onset of permanent deformation) is referred to as:

Yield strength

The family of hardness tests that uses both a minor and major load is called:

Rockwell

Stainless steels are defined as having at least what percent chromium?

12%

The process where carbon is added to the surface of a steel to harden it is:

Pack carburizing

Which of the following is a function of the flux coating of a SMAW electrode?

a. Insulating
b. Alloying
c. Shielding
D. ALL OF THE ABOVE

What is the lead angle?

The angle between the electrode and the vertical plane when viewed from the side.

When undercutting is a problem while arc welding, which adjustment would most likely correct the problem?

Reduce the current

What will be the result if you are using too low of an amperage when arc welding?

The bead will be excessive.

An example of a metal that is "brittle" is:

cast iron

An AC welding machine is powered by high voltage and should only be serviced by a:

Qualified electrician

Arc welding can be performed in almost any position, but welding is most easily done if the weld is in the _______position.

Flat

A _______ is also known as a fillet weld.

T-weld

When making a T-weld the arc should be directed more toward the bottom plate to prevent:

Undercutting on the top piece

What does the abbreviation GMAW stand for?

Gas Metal Arc Welding

The UL symbol means:

Underwriters Laboratory

Porosity in a weld might be caused by _______.

Rust on the metal

When arc welding, injury to the eyes can result from:

a. Chippingwithouteyeprotection
b. Viewing welding without a helmet or shield
c. Welding with less than a number 10 lens
D. ALL OF THE ABOVE

The appearance and strength of a bead are influenced by the:

a. Amperagesettingoftheweldingmachine.
b. Angle that the electrode is held.
c. Travel speed when making the weld.
D. ALL OF THE ABOVE

When welding with a direct current machine straight polarity, the electrode holder would be:

Negative

The output of an arc welding machine is commonly expressed in terms of:

Amperage

AC welding machines house transformers to reduce input _______ and increase output _______ for safe and effective welding.

Voltage-amperage

The AC/ DC welding machine is essentially an AC welder with an electronic device to convert AC to DC power. This electronic device is called a(n):

Rectifier

What are probable results if the welding current is too high or the arc length is too great?

A wide, splattered, irregular weld.

Which of the following is NOT a cause of undercutting?

Amperage set too low

Which of the following characteristics is not important in determining the type of welding electrode to select?

The weight of the metal

Which type of SMAW welding machine provides from both AC and DC current for welding?

Transformer/rectifier

Why is a change in polarity useful in electric arc welding?

Controls heat and depth of penetration

The last digit in the electrode number designates the _______.

Special characteristics of the electrode

In the GMAW welding process, the "consumable" electrode is in the form of a:

Continuous wire

Which of the following is recommended to be worn under the welding helmet for safety protection of the eyes when accomplishing other tasks besides welding?

Clear safety glasses

The first two digits in the AWS electrode classification number designates the:

Tensile strength

Which of the following would be classified as a destructive type weld test?

Guided bend

In the shielded metal arc welding process, impurities are floated out of the molten puddle to form a deposit known as _______ that protects the weld as it cools.

Slag

You must know the kind of metal to be welded before you can select an electrode. Which of the following is an example of a ferrous metal?

Steel

What term is used to describe the continuous running time for which a welding machine was designed?

Duty cycle

What is meant by the term "ductility" as it applies to metal?

The ability of a metal to be permanently twisted or bent without breaking.

The property of a metal that allows it to withstand forces, sudden shock or bends without fracturing.

Toughness

Tensile strength refers to:

The ability of a metal to resist being pulled apart.

The ability of a metal to resist being twisted apart is called its.

Torsional strength

The ability of a metal to resist fracture under a sudden load is called its:

Impact strength

What does to term "quenching" refer to in welding?

Rapidly cooling a metal.

Which of the following metals has a carbon content between 2% and 4%?

Cast iron

What is an alloy metal?

A metal with one or more elements added to it.