Oxyfuel Cutting Review Activity

Question 1

A ______ _____ can be used on a cast iron to cut it during demolition projects.

Answer 1

oxygen lance

Question 2

A good standoff distance from the pre-heat cones to the plate is ______

Answer 2

1.6 mm - 3.2mm (1/16” - 1/8”)

Question 3

Generally a ______ flame should be used for cutting.

Answer 3

neutral

Question 4

Heat energy is expressed in ________

Answer 4

Megajoules per cubic metre (MJm3) or British Thermal Units per cubic foot (BTU/ft3)

Question 5

If cutting materials 6” thick or greater a _____ torch is recommended.

Answer 5

Standard or Heavy duty cutting torch

Question 6

If the inner flame cones are of different lengths, then _____

Answer 6

shut off the torch and clean or redrill the preheat orifices

Question 7

If travel speed when cutting is too fast ______

Answer 7

slag will bubble up to the surface of the plate cause cutting jet stream cannot blow through the full thickness of the material.

Question 8

On a combination torch, the torch handle oxygen valve should be _______ when lighting the torch.

Answer 8

Fully opened

Question 9

Rapid oxidation occurs when steels are heated to their kindling point of _______ and a jet stream of high-pressure oxygen is directed onto the hot spot

Answer 9

760c - 870c (1400f - 1600f)

Question 10

Should you leave a radiograph of pipe beveller unattended when cutting?

Answer 10

Never

Question 11

The most popular torch unit is _____

Answer 11

combination welding and cutting torch`

Question 12

The recommended oxygen and acetylene pressures for a #1 tip are ______

Answer 12

oxygen pressure 30 psi and acetylene pressure 3 psi

Question 13

The slag when cutting will collect _______

Answer 13

on the piece that the tip is pointing at

Question 14

The ________ tip is good for removing minor imperfections during foundry and casting work.

Answer 14

scarfing

Question 15

Thinner materials require _____ inclination

Answer 15

more forehand

Question 16

three methods for controlling the torch when cutting are ________

Answer 16

1. across cut
2. pull cut
3. push cut

Question 17

____________ torches are used for automatic cutting

Answer 17

machine-cutting

Question 18

two methods for piercing holes thru solid plates are _______

Answer 18

the still torch method and the travelling torch method

Question 19

what type of preheat tip generally fives a faster, more even cut?

Answer 19

6 preheat hole tip

Question 20

when using a tip cleaner too small for the orifice ___________

Answer 20

you may damage it by filing it out of round.