Oxyfuel Cutting

Question 1

Describe the oxy fuel cutting process

Answer 1

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.

Question 2

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

A)
B)

Answer 2

Cast Irons

check

Stainless Steels

Question 3

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

Answer 3

C) Kerf

Question 4

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

Answer 4

C)Fully open

Question 5

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

Answer 5

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

Question 6

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

Answer 6

B)High-speed cutting tip

Question 7

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

Answer 7

D) Thicker the plate that you can cut

Question 8

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

Answer 8

B)Mild steel’s

Question 9

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

Answer 9

C)Pre-mixing

Question 10

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

Answer 10

A)Steel

Question 11

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

Answer 11

D) Electronic

Question 12

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

Answer 12

C)Kindling point

Question 13

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

Answer 13

C)Using a dirty tip

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

A)The tip is too large for the material thickness

Question 17

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

Answer 17

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

Question 18

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

Answer 18

A) Inspecting the kerf lines

Question 19

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

Answer 19

C)Perpendicular to the plate surface

Question 20

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

Answer 20

A)Oxygen cylinder is nearly empty

Question 21

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

Answer 21

E) All of the above

Question 22

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

Answer 22

D) both B and C

Question 23

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

Answer 23

True