Oxyfuel Cutting Flashcards

1
Q

Describe the oxy fuel cutting process

A

Oxyfuel cutting is a controlled process of rapid oxidation in which steel is heated to its kindling temperature and a high-pressure jet of pure oxygen is directed to the heated area. Metal exposed to the oxygen oxidizes and is blown away by the oxygen jet stream.

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2
Q

What two Ferrous based models cannot be cut satisfactorily with an oxy fuel cutting torch

A)
B)

A

Cast Irons

check

Stainless Steels

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3
Q
When A piece of metal is cut it creates a cut gap called the
A) Groove
B)Bead
C) Kerf
D) Crater
A

C) Kerf

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4
Q
On a combination cutting torch the oxygen valve on the torch handle must be
A)Close tightly
B)Partially open
C)Fully open
D) Used to adjust to a neutral flame
A

C)Fully open

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5
Q

The rivet cutting tip is designed to
A)Make suitable holes for riveted construction
B)Facilitate right angle square hole cutting
C)Facilitate cutting in confined spaces
D) Cut off rivet and bolt heads without disturbing the parent metal

A

D) Cut off rivet and bolt heads without disturbing the parent metal

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6
Q
Which cutting chip has the preheat orifices in a small pitch circle around the cutting orifice
A)Standard cutting chip
B)High-speed cutting tip
C)Gouging tip
D) Rivet cutting chip
A

B)High-speed cutting tip

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7
Q
The larger the orifices of a cutting tip the
A)Less gas you burn
B)Greater the heat loss
C)faster you catch
D) Thicker the plate that you can cut
A

D) Thicker the plate that you can cut

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8
Q
Which metals can you cut easily using the Oxyfuel cutting process
A)Cast iron’s
B)Mild steel’s
C)Stainless steel’s
D) Nickel alloys
A

B)Mild steel’s

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9
Q
Which oxy fuel torch design has the mixer chamber inside one of the tubes leading to the torch head
A)Tip mixing
B)High speed
C)Pre-mixing
D) Oxygen Lance
A

C)Pre-mixing

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10
Q
Templates for magnetic tracers are made of
A)Steel
B)Nonferrous metal
C)Plastic
D) Paper cut outs
A

A)Steel

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11
Q
Photoelectric cells and computer controls are used with \_\_\_\_\_\_Tracer guided cutting machines
A)Manual
B)Machine
C) magnetic
D) Electronic
A

D) Electronic

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12
Q
When preheating for flame cutting the metal should be heated until it reaches its
A)Liquid state
B)Bright yellow colour
C)Kindling point
D)Transition temperature
A

C)Kindling point

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13
Q
When the cut is rough and slag accumulates on the bottom edge the likely causes is
A)Using propane fuel gas
B)Using oxygen that is only 99.5% pure
C)Using a dirty tip
D) Using a cutting attachment type torch
A

C)Using a dirty tip

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14
Q

When piercing holes in a plate you should
A)Press the cutting lever sharply to start the cut
B)Allow the preheat cones to touch the material surface
C)Raise the oxygen pressure by 25%
D) Raise the tip whe the cutting lever is depressed

A

D) Raise the tip when they’re cutting lever is depressed

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15
Q

What is likely to happen if the cutting travel speed is too fast
A)Productivity increases and your employer is very impressed
B)Slag bubbles to the surface and the cutting action eventually stops
C)The tip overheats and begins to backfire
D) A clean slag free cut is produced

A

B)Slag bubbles to the surface and the cutting action eventually stops

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16
Q

What is the likely problem if the kerf edges are melting back together behind the cut
A)The tip is too large for the material thickness
B)Impurities are in the fuel gas
C)The steel has to hire a carbon content
D) You are running low on fuel gas

A

A)The tip is too large for the material thickness

17
Q

If a shop were to switch from acetylene to propane gas for cutting it would be necessary to
A) Purchase all new cutting torches
B)Install special fuel gas regulators
C)Check with the manufacturer to determine if the equipment is compatible
D) Change to larger size hoses

A

C)Check with the manufacturer to determine if the equipment is compatible

18
Q

You can determine a good quality cut by
A) Inspecting the kerf lines
B)Asking the foreman
C)The amount of welding experience the operator has
D) The amount of oxygen and acetylene consumed

A

A) Inspecting the kerf lines

19
Q
Kerf drag lines on a properly perform shape cut should be
A)Irregular and profile
B)Curved to match the shape
C)Perpendicular to the plate surface
D) Horizontally inclined
A

C)Perpendicular to the plate surface

20
Q
If you notice the preheat flames changing from neutral to carbonizing during the cutting process the most likely cause would be that the:
A)Oxygen cylinder is nearly empty
B)Acetylene consumption is too high
C)Acetylene cylinder is nearly empty
D) Tip is dirty and requires cleaning
A

A)Oxygen cylinder is nearly empty

21
Q
What tools can you use to Layout a structural shape
A)Contour marker
B)Hammer and centre punch
C)Square and level
D) Combination squares
E) All of the above
A

E) All of the above

22
Q

A skid unit requires 2S sheets to be welded together to create a 90° angle how can you cut the S shapes to create the required fit gap?
A) but the flanges together and weld the gaps
B)Cope one beam to fit inside of the other
C)Cut an angle of 45° on each shape and fit together
D) both B and C
E) All of the above

A

D) both B and C

23
Q

When cutting structural shapes, it is important to remember to watch your torch angle. A torch angle that is off can cause a structural shape to be cut in correctly, which could result in a scrap piece.

True or false

A

True