Weld 111 Final study guide

Which of the following is a force that restricts the flow of current in an electrical circuit?

Resistance

Which of the following polarities will result in deeper penetration when used for the SMAW process?

DCEP

According to the Protection of Personnel and the General Area section of ANSI Z49.1, eye and face protection must meet which of the following standards?

ANSI Z87.1

According to the Definitions section of ANSI Z49.1, what does the term SHALL indicate?

A mandatory requirement that must be done

Which of the following terms describes the LOWEST temperature that a metal or metal alloy is completely LIQUID?

Liquidus

Which of the following is a thermal joining process that is considered to be solid-liquid-solid, does NOT involve melting of the base material, derives most of its strength from the joint design, involves capillary action to distribute filler throughout the joint and takes place at temperatures BELOW 840oF or 400oC?

Soldering

Which of the following correctly refers to the cable and connection that attaches to the workpiece in a welding circuit?

Work

According to the Fire Prevention and Protection section of ANSI Z49.1, what is the suggested radius of proximity between welding or cutting operations and storage of combustible materials in the US - based on how far a spark can travel from the welding or cutting area?

35 Feet

Which of the following terms is used to warn against potential hazards that will definitely result in permanent injury or death if certain precautions are not taken?

Danger

The input voltage supplied to a welding power source from a utility or electrical power generator is known as which of the following?

Primary voltage

Which of the following refers to the area around the weld zone that is part of the base that DID NOT MELT, but was affected by the heat of welding?

Heat affected zone

Which of the following refers to a material that does NOT allow current to flow and is described in terms of high resistance?

Insulator

Which of the following is a thermal joining process that is considered to be solid-liquid-solid, does NOT involve melting of the base material, derives most of its strength from the joint design, involves capillary action to distribute filler throughout the joint and takes place at temperatures ABOVE 840oF or 400oC?

Brazing

Which of the following terms is used to describe a mixture of metals and non-metals that are combined to achieve specific mechanical, thermal or electrical properties?

Alloy

According to the Protection of Personnel and the General Area section of ANSI Z49.1, which of the following are the preferred clothing materials for welding?

Wool or cotton

According to the Definitions section of ANSI Z49.1, which of the following terms is used to denote a relatively small or restricted space that may have poor ventilation and/or may restrict the egress of personnel?

Confined space

Which of the following terms describes a component of the welding circuit that carries welding current and may or may not add filler metal to the weld pool?

Electrode

According to the Fire Prevention and Protection section of ANSI Z49.1, how long shall a fire watch be maintained after all welding and cutting have stopped?

60 minutes

Which of the following terms describes the HIGHEST temperature that a metal or metal alloy is completely SOLID?

Solidus

Which of the following should be the basis or foundation of all safety programs, policies or plans when welding, cutting or an allied process is used?

ANSI Z49.1

Which of the following refers to a material that readily allows current to flow through it?

Conductor

Which of the following refers to the legal limit of exposure to a chemical or gas without causing harm over an 8-hour period or single working shift, but doesn't accurately account for an entire working lifetime?

PEL - Permissible exposure level

Which of the following is said to flow in an electrical circuit and represents the flow of electrons when measured at any given point?

Current

In addition to a focus on protecting your eyes and skin, what other category is personal protective equipment for welding (PPE) concerned with?

Head

Which of the following is a graphical character connected to a reference line that specifies the joint geometry and/or weld type?

Weld symbol

Which of the following is represents the potential, force or pressure that causes electrons to flow in an electrical circuit?

Amperage

Which of the following describes the direction that electrons flow in a welding circuit?

Flow of electrons is ALWAYS from negative (-) to positive (+)

Exceeding the maximum hourly withdrawal rate of an acetylene cylinder can cause which of the following to occur?

Acetylene blowing

The function of a pressure regular is to reduce high, storage pressures to which of the following pressures?

Working pressure

Which of the following is TRUE about oxyfuel gas cutting?

Limited to iron-based alloys with low alloy content

Which of the following describes the type of gas installation show in the image below?

Manifold system

Which of the following hose types or grades is approved for use with all types of fuel gases and oxygen?

T-grade

Which of the following is often the most effective means of controlling a fuel gas fire?

Turn off the cylinder valve

Which of the following should be used to identify the content of a compressed gas cylinder?

Labels

Oxygen and acetylene produce which of the following compounds when burned with the appropriate stoichiometric gas molecule ratios?

Carbon dioxide (CO2) and water (H2O)

Which of the following is the temperature of a neutral flame produced by oxygen and acetylene?

3100oC / 5612oF

Which of the following describes the reason that acetylene is preferred for many industrial applications that use the oxy-fuel process?

Combustion intensity

Preheat flames used in oxygen cutting must reach which of the following temperatures?

Kindling

Which of the following is the maximum gas withdrawal rate per hour of acetylene gas compared to the cylinder storage size?

1/7th

Which of the following is TRUE about the use of high pressure cylinders?

Formed by deep drawing

Which of the following flame types may cause weld embrittlement and is therefore usually avoided?

Carburizing

Which of the following safety devices used with oxy-fuel applications is designed to prevent the propagation of a flame into the gas supply system?

Flashback arrester

Which of the following is TRUE about the use of lowpressure cylinders?

Valves should only be opened 1-2 turns max

Oxyfuel gas cutting of steel involves the formation of which of the following compounds that is expelled from the cutting area at elevated temperatures?

Iron oxide

Which of the following gases is often considered the most dangerous and requires special precautions because it can ignite and explode if pressurized with hydro-carbons are other contaminants?

Oxygen

The absolute pressure that acetylene becomes unstable and can explode is known to be which of the following?

29.4 psi

Which of the following must be used with compressed gas cylinders that are being stored or NOT being used?

Protective caps

When cutting metal with oxy-fuel, which of the following describes the lag between the top and bottom of the cut that results in curved lines on the cut surfaces in the opposite direction of travel?

Drag

The thread and valve system used to improve safety and reduce potential gas injuries was developed by which of the following organizations?

CGA - Compressed Gas Association

Which of the following safety devices used with oxy-fuel applications is designed to prevent the backflow of gases in an oxy-fuel system, but will NOT stop a flame from traveling upstream to the gas supply?

Reverse flow check valve

Which of the following is the weakest area of a gas cylinder?

Valve

Which of the following terms is used to describe the narrow width of metal that is progressively removed or "cut out" during the oxyfuel cutting process?

Kerf

Which of the following materials should NOT be welded using oxy-fuel?

Stainless steel

Which of the following is the approximate pressure in a fully charged high pressure cylinder?

2400 psi

In an oxy-fuel system, which of the following is the area of the handle or tip where fuel gas is combined with oxygen for combustion?

Mixing chamber

Which of the following describes the condition when a liquid filler metal spreads for flows out and adheres to the base metal in a continuous layer?

Wetting

Which of the following should be done to the base metal before applying flux when brazing or soldering?

Cleaning

Which of the following describes the relationship between base and filler metals when performing the brazing or soldering process?

Solid-Liquid-Solid

Which of the following describes the "highest temperature at which a metal or alloy is completely solid, point at which melting begins?"

Solidus temperature

Which of the following is defined as the "lowest temperature that a metal or alloy is completely liquid and the point at which freezing begins"?

Liquidus temperature

Which of the following explains the primary purpose of the flux used for brazing and/or soldering?

Prevent oxide formation at operating temps

The brazing process is classified by the use of filler metals with a liquidus temperature above which of the following temperatures?

840 oF (400 oC)

The main difference between brazing and braze welding is the fact that brazing involves which of the following forces?

Capillary action

Which of the following are the most widely used filler metal alloys for soldering, although they are not recommended for high purity or drinking water applications?

Tin- lead

Which of the following would represent the filler metal classification for a brazing alloy containing primarily silver?

BAg

Why does the molten slag float on the surface of the SMAW molten weld pool?

It has a lower density than the metal.

Another name for shielded metal arc welding (SMAW) is which of the following?

Stick welding

When welding with AC (Alternating current), how many times does the arc go out in one second?

120

The welding current level during the SMAW process is limited by the ______________ of the electrode.

Resistive heating

Which term is used to describe the undesirable deflection of the arc by magnetic forces?

Arc blow

What is defined as the voltage between the output terminals generated by the welding machine when no welding is being done?

Open-circuit voltage

SMAW always uses a covered electrode?

True

What is the as-welded tensile strength of an E6010 electrode deposited weld metal?

60,000 psi

When using alternating current (AC) the weld arc, (electricity between electrode and workpiece) extinguishes itself every time the arc changes direction.

True

Which electrode classification designates a "low hydrogen" covering type?

E7016

What does the "1" represent in an Exx1x electrode classification?

All position welding

A "fast-freeze" electrode can be used in the vertical position when welding.

True

Which is an "electrode characteristic" of an E6010 electrode?

Light slag, DC welding

The power source output characteristic required for SMAW is which of the following?

Constant current

A transformer power source uses a step-down transformer to change low voltage, high amperage input power to high voltage, low amperage welding output power.

False

The AWS Specification covering carbon steel SMAW electrodes is which of the following?

A5.1

Which of the follow polarities provide the best penetration?

DCEP

A rectifier power source takes AC input power and turns it into DC welding output power.

True

With all other welding variables held constant, higher current densities have what effect on the weld profile?

More penetration

Which of the following gases is produced during the formation of SLAG when SMAW or STICK welding, which helps to shield the weld pool until the slag can solidify?

Carbon dioxide

Which of the following is controlled by arc length during SMAW?

Voltage

Which of the following functions helps to prevent the arc from sticking during SMAW or STICK welding?

Arc force

Which of the following is considered to be newer, smaller, efficient and powerful types of power source designs available for SMAW or STICK welding?

Invertors

Which of the following electrodes should be stored in a hermetically sealed container or in an oven at 250 degrees F?

E7018

Which of the following electrodes is NOT suitable for all-position welding and instead, should only be used for flat grooves and flat/horizontal fillet welds?

E7024

As a rule, which electrode type would be best for out-of-position welding, filling gaps with good penetration on rusty or dirty metal?

Fast freeze

Which of the following is considered to be the older, larger and more limited types of power source designs available for SMAW or STICK welding?

Transformers/Rectifiers

Which of the following CURRENT/POLARITY is mostly used for thin sheet metal, filling large gaps and resurfacing or build-up applications because it has good deposition with limited/low penetration?

DCEN

The machine duty cycle represents the welding output parameters that can be sustained for a % of a welding cycle that is how long in minutes?

10

Which of the following power source components is responsible for converting or "stepping down" AC power from the utility supply into low voltage/high current AC power for welding?

Transformer

Which of the following terms is used to describe the situation in the following image where only a partial AC waveform is depicted without the EP (electrode positive) half-cycle because it failed to ignite as a stable arc?

Arc rectification

Which of the following power source control types is used and most often recommended for the GMAW process?

Constant voltage

Which of the following current and/or polarity is most often used for GTAW of materials like aluminum due to cleaning and penetration properties?

AC (alternating current)

Which of the following current and/or polarity is most commonly used for GMAW because it provides good weld penetration?

DCEP

Which of the following modes of transfer for GMAW does NOT transfer metal across the arc?

Short-circuit