C4 - LT#2

Question 1

When you turn the pressure-adjusting screw on the regulator all the way it, it _______

Answer 1

closes the regulator

Question 2

The lines are said to be ______ when the cylinder valves are open, working pressures are set and the torch valves are closed.

Answer 2

Pressurized

Question 3

An acetylene cylinder valve outlet for the regulator is left-hand threaded and _____ threaded as an extra precaution against improper set-up

Answer 3

Internally

Question 4

An oxygen cylinder valve outlet for the regulator is right-handed threaded and ______ threaded as an extra precaution against improper set-up

Answer 4

Externally

Question 5

Before you light a torch, always check for ______ in the line

Answer 5

Leaks

Question 6

The only thing that should be used to create a spark for lighting a torch is a _____

Answer 6

Flint striker

Question 7

A flame that has an excessive amount of acetylene compared to a neutral flame is called a ______

Answer 7

carburizing flame

Question 8

when oxygen is added to the acetylene flame, the flame changes color from yellow red to

Answer 8

blue

Question 9

Name the three types of Oxyacetylene flame that can be produced:

Answer 9

1) Neutral flame
2) Carburizing (reducing flame)
3) Oxidizing flame

Question 10

When shutting down the flame, first close the ______

Answer 10

Acetylene torch valve
(A BEFORE O)

Question 11

If the cutting plate 13 mm (1/2”) or thicker, hold the cutting tip ______

Answer 11

Perpendicular to the plate

Question 12

The cutting oxygen lever should be depressed when the metal has been preheated to a ______ color

Answer 12

Cherry red

Question 13

The vertical lines created on the cut edge by the cutting action on metal are called:

Answer 13

Drag lines

Question 14

Name 4 factors that can affect the quality of an oxyacetylene cut:

Answer 14

1) Working pressure setting
2) amount of preheated flame
3) angle of the torch tip relative to the metal
4) tip-sized speed of cutting torch across the meter

Question 15

If the inner cone is pointed and the flame hisses, too much oxygen has been added - this is a

Answer 15

oxidizing flame (excess oxygen)

Question 16

the flame is blue, with a dark blue feathered cone. This is is a

Answer 16

Carburizing flame (excess acetylene)

Question 17

A neutral flame is ideal for:

Answer 17

Fusion welding and preheating steel for cutting - (Temps range from 3075 c to 3237 c)

Question 18

A carburizing flame is used for:

Answer 18

Brazing and other applications where oxidizing the metal would cause poor welds or where lower flame temp is required

Question 19

An oxidizing flame is used for:

Answer 19

Braze welding due to it’s cleaning effect on the base metal

Question 20

Can non-ferrous alloys be cut with the oxyacetylene process?

Answer 20

No, cannot be cut if it contains no iron

Question 21

Angling the torch 90 degrees for which thickness of metal?

Answer 21

For 13 mm or greater

Question 22

For a plate 6 to 13 mm, what should the cutting tip be angled at?

Answer 22

60 to 70 degrees

Question 23

For a plate than 6 mm (1/4”) thick, tip the angle at 15 degrees to

Answer 23

20 degrees

Question 24

The tip should remain how far above the plate at all times?

Answer 24

10 mm

Question 25

Since RFCV are sensitive and may become plugged, how often should they be tested?

Answer 25

At least once a week

Question 26

What is the pressure test?

Answer 26

Increase the working pressures to 10 PSI, after opening the cylinder valves. After adjusting the working pressure, close both the cylinder valves again and watch the cylinder pressure gauges for pressure drop. Make sure the torch valves are closed.

Question 27

What must you be equipped with for welding?

Answer 27

Safety goggles, heavy leather gloves, coveralls, boots and a welding cap

Question 28

What does bleeding the lines mean?

Answer 28

Releasing of the gas pressure is still in the system.

Question 29

How do you bleed the lines?

Answer 29

Tightly close the acetylene cylinder valve first, then the oxygen cylinder valve.

Next, open the acetylene torch valve, pressure readings on both acetylene gauges will drop to zero.