Oxyacetylene And Gmaw Equipment Exam

Front 1

On a welding helmet, shade number ______ is recommended as a minimum when performing GMAW welds.

A) 14
B) 12
C) 11
D) 10

Back 1

D) 10

Front 2

On a constant speed wire feeder the welding current is adjusted by increasing or decreasing the:

A) wire speed.
B) supply voltage.
C) arc length.
D) size of wire.

Back 2

A) wire speed.

Front 3

When referring to wire feed systems, electrical stick-out refers to the distance from the end of the:

A) wire that is sticking out of the roll.
B) contact tube to the end of the wire.
C) contact tube to the roll of wire.
D) wire to the point of the weld.

Back 3

B) contact tube to the end of the wire.

Front 4

Hoses used to supply oxygen are generally ______ in colour.

A) black
B) orange
C) red
D) green

Back 4

D) green

Front 5

Whiskers protruding through the joint in GMAW may be caused by:

A) too large of a puddle.
B) too high of gas speed.
C) wire stick out too excessive.
D) travel speed being too fast.

Back 5

D) travel speed being too fast.

Front 6

If the nozzle and contact tube with GMAW gets obstructed it will cause:

A) the current to vary.
B) splatter to diminish.
C) porosity and poor quality welds.
D) too great of a gas flow.

Back 6

C) porosity and poor quality welds.

Front 7

When joining light gauge metals ______ transfer mode is the best GMAW.

A) short-circuit
B) spray
C) globular
D) oxy-fuel

Back 7

A) short-circuit

Front 8

An indication that you are using a _______ is a rough cut with slag accumulating on the bottom edge.

A) dirty tip
B) rich mixture
C) magnetic tracer
D) poor grade of fuel

Back 8

A) dirty tip

Front 9

When a forehand inclination is compared to a backhand inclination it can be seen that the forehand will produce a:

A) flatter bead with less penetration.
B) flatter bead with deeper penetration.
C) narrower bead with a higher crown.
D) narrower bead with a lower crown.

Back 9

A) flatter bead with less penetration.

Front 10

Nozzle sprays can be used to:

A) cool the contact tip.
B) minimize splatter build-up.
C) clean the weld zone.
D) clean the gas nozzle.

Back 10

B) minimize splatter build-up.

Front 11

If the brake on a wire spool is set with an excess of braking it will cause the:

A) spool to run on when feeding stops.
B) wire to unravel when not in use.
C) wire to feed through too fast.
D) drive rolls to slip on the wire.

Back 11

D) drive rolls to slip on the wire.

Front 12

If the preheat flames are too long you will find:

A) top edge of the cut is melted and uneven.
B) slag accumulates unevenly on the bottom of the cut
C) slag accumulates on the top of the cut.
D) bottom edge of the cut is melted and uneven.

Back 12

A) top edge of the cut is melted and uneven.

Front 13

A carbonizing flame is said to have too much:

A) acetylene.
B) oxygen.
C) water.
D) acetylene and oxygen.

Back 13

A) acetylene.

Front 14

The design of a welding helmet protects the welders face from:

A) slag.
B) light.
C) heat.
D) all of the above.

Back 14

D) all of the above.

Front 15

A shielding gas is used in the gas metal arc welding process to:

A) combine with the oxygen and produce more heat.
B) reduce the carbon content in the weld.
C) produce a more ductility weld.
D) prevent atmospheric contamination.

Back 15

D) prevent atmospheric contamination.

Front 16

When a forehand inclination is compared to a backhand inclination it can be seen that the backhand will produce a:

A) flatter bead with less penetration.
B) flatter bead with deeper penetration.
C) narrower bead with a higher crown.
D) narrower bead with a lower crown.

Back 16

C) narrower bead with a higher crown.

Front 17

If a fuel gas connector has a groove cut around it this is an indication that it is:

A) a right hand thread.
B) a left hand thread.
C) an oxygen fitting.
D) defective fitting.

Back 17

B) a left hand thread.

Front 18

Failure to melt into the surface of a joint is referred to as:

A) burn through.
B) undercut.
C) lack of penetration.
D) lack of fusion.

Back 18

C) lack of penetration.

Front 19

Metal should be heated until it reaches its ______ before flame cutting begins.

A) bright yellow color
B) liquid state
C) melting point
D) kindling point

Back 19

D) kindling point

Front 20

If a welder is wearing clear safety glasses and a CSA certified face shield to perform oxyfuel welding then a number ____ shade or higher should be used.

A) 1
B) 2
C) 3
D) 4

Back 20

D) 4

Front 21

Hoses used to supply acetylene are generally ______ in colour.

A) black
B) orange
C) red
D) green

Back 21

C) red

Front 22

An acetylene cylinder has a safety device called a _______ that will melt in case of a fire allowing gas to escape thereby preventing an exposition.

A) safety fuse
B) fusible plug
C) bursting disc
D) frangible disc

Back 22

B) fusible plug

Front 23

The maximum safe working pressure for acetylene is _____ kPa.

A) 200
B) 193
C) 159
D) 100

Back 23

D) 100

Front 24

Oxyacetylene equipment can not be used to cut:

A) aluminium.
B) copper.
C) nickel.
D) all of the above.

Back 24

D) all of the above.

Front 25

One of the key advantages to using short-circuit metal transfer technique is:

A) distortion is at a minimum.
B) it is splatter free.
C) there are no weld faults.
D) the high rate of burn off.

Back 25

A) distortion is at a minimum.

Front 26

Burn through in a weld can be caused by:

A) excessive current.
B) root face being too small.
C) too slow of travel speed.
D) all of the above.

Back 26

D) all of the above.

Front 27

Cutting torches differ from welding torches because they are:

A) have a different tip design for each process.
B) able to burn acetylene.
C) formed to shape versus being bent to shape.
D) much easier to use.

Back 27

A) have a different tip design for each process.

Front 28

You would adjust your flame to an oxidizing flame when:

A) fusion welding of cast iron.
B) aluminium brazing.
C) braze welding of steel.
D) fusion welding of bronze.

Back 28

D) fusion welding of bronze.

Front 29

Gas flow for shielding gas is measured in:

A) L/Hr
B) PSI
C) RPM
D) CFH

Back 29

D) CFH

Front 30

Gas metal arc welding is often referred to as ______ welding.

A) flux core
B) MIG
C) oxy-fuel
D) shielded metal arc

Back 30

B) MIG

Front 31

The current type most often used in the GMAW process is:

A) DCEP (direct current, electrode positive)
B) DCSP (direct current, straight polarity)
C) AC (alternating current)
D) HAC (high frequency alternating current)

Back 31

A) DCEP (direct current, electrode positive)

Front 32

When referring to the torch inclination of a cutting torch you can say that it is the angle of the torch relative to the:

A) direction of travel.
B) metal angle.
C) angle of weld.
D) torch tip.

Back 32

A) direction of travel.

Front 33

When a cylinder is empty it should be marked:

A) NFG
B) MT
C) EMPTY
D) Out

Back 33

B) MT

Front 34

Gloves made of ______ should be used for welding.

A) polyester
B) asbestos
C) oiled leather
D) leather

Back 34

D) leather

Front 35

The most accurate method to determine the amount of acetylene gas left in a cylinder is to:

A) read the gauge.
B) shake it and listen.
C) weigh the cylinder.
D) look for condensation marks.

Back 35

C) weigh the cylinder.

Front 36

A regulator's main function is to maintain a constant delivery pressure and:

A) ensure that gas volumes are maintained.
B) act as an effective mixer of gases.
C) only operate on individual oxyfuel outfits.
D) reduce the source pressure to an operating pressure.

Back 36

D) reduce the source pressure to an operating pressure.

Front 37

The purpose of the flowmeter in a GMAW process is to:

A) reduce the source pressure.
B) maintain a constant flow of gas.
C) record the amount of gas used.
D) control the rate of flow of the shield gas.

Back 37

D) control the rate of flow of the shield gas.

Front 38

A welder will make a selection of the tip size used for cutting based on:

A) color of the material.
B) time required to perform the cut.
C) design of cut.
D) material thickness.

Back 38

D) material thickness.

Front 39

Pinching of the wire in a GMAW system could result in erratic wire feeding which causes:

A) a deep undercut.
B) porosity.
C) a stable arc.
D) arc hunting.

Back 39

D) arc hunting.

Front 40

________ type of clothing is considered unsafe for a welder to wear when welding.

A) Leather
B) Denim
C) Rayon
D) Wool

Back 40

C) Rayon

Front 41

A serious weld fault know as lack of fusion can result in:

A) a deep undercut.
B) complete failure of the weld.
C) deep weld penetration.
D) a serious puddle forming.

Back 41

B) complete failure of the weld.

Front 42

A two stage regulator would be used in applications for:

A) delivery gas at varying pressure.
B) feeding to sensitive instrumentation.
C) station outlets on a manifold system.
D) an individual outfit.

Back 42

B) feeding to sensitive instrumentation.

Front 43

A smooth hissing sound is produced when using _______ transfer.

A) globular
B) short-circuit
C) spray
D) pulsed arc

Back 43

C) spray

Front 44

If after adjusting the controls you find that the cutting pre-heats are uneven you should:

A) clean the center orifice.
B) throw away the tip.
C) increase the pressure of the acetylene.
D) clean the tip.

Back 44

D) clean the tip.

Front 45

Excessive travel speeds with GMAW can result in:

A) large weld beads.
B) narrow weld beads.
C) burn through.
D) lack of fusion.

Back 45

B) narrow weld beads.