Oxy-Acetylene

Question 1

What is the temperature of a cutting tip with a neutral flame?

Answer 1

5600 degrees farenheit.

Question 2

What is metal fume fever (MFF)

Answer 2

A short-term illness caused by inhaling metal fumes, especially zinc oxide. It’s an occupational disease that commonly occurs during welding, smelting, casting, brazing, and soldering.

Question 3

What does bleeding the lines mean?

Answer 3

Reducing line pressures to atmospheric pressure

Question 4

Drill bits are manufactured with an included angle of

Answer 4

118 Degrees

Question 5

A screeching sound accompanied by black smoke and red sparks indicates that the tip has a:

Answer 5

Burnback

Question 6

A steamed vessel is safest to weld on when it is cooled down to room temperature?

Answer 6

False.

Question 7

Grossly unequal pressure of gases may cause a

Answer 7

Flashback.

Question 8

After attaching regulators to cylinder valves, and before opening cylinders, make sure that:

Answer 8

pressure adjusting screws are disengaged

Question 9

The critical pressure of C2H2 is?

Answer 9

28 psi

Question 10

What is the explosive limit of acetylene in pure oxygen?

Answer 10

2.5-80%

Question 11

What is the safety device on an oxygen cylinder?

Answer 11

Rupture disc

Question 12

What is the bursting pressure an oxygen rupture disc?

Answer 12

3200 psi

Question 13

In order to protect the regulator gauges:

Answer 13

Release the adjusting screw before you open the cylinder valve.

Question 14

Why are the cylinder valves cracked before the regulators are attached?

Answer 14

Remove dust or dirt from the valve

Question 15

What precaution should be taken when regulators are to be stored for extended periods of time?

Answer 15

Turn the working pressure adjusting screw in to take the valve off of the valve seat

Question 16

How would you safely repair an acetylene hose?

Answer 16

Use approved fittings of yellow brass, iron or steel

Question 17

Which type of welding tip gives you a long pointed flame?

Answer 17

Swedge bore

Question 18

What tool would be used to properly clean a dirty oxy-fuel welding tip?

Answer 18

Tip drill

Question 19

The reason for purging each line individually before lighting a welding or cutting torch is to:

Answer 19

Prevent a possible flashback from occurring.

Question 20

Grossly unequal pressure of gases may cause a:

Answer 20

Flashback

Question 21

A burnback is when the fire:

Answer 21

Stays steadily in the tip and mixer.

Question 22

What is meant by the term 2X flame?

Answer 22

The cone and the feather are both the same length

Question 23

Changing the tip size to a smaller size when oxy-acetylene welding with a neutral flame will produce a flame temperature that:

Answer 23

It’s the same

Question 24

A screeching sound accompanied by black smoke and red sparks indicates that the tip has a:

Answer 24

Burnback

Question 25

A popping flame, at the mixer nut, would indicate that the:

Answer 25

small “0” ring is damaged.

Question 26

When balancing a No. 2 welding tip and the acetylene torch needle valve is fully open, the acetylene regulator should be adjusted so that the flame blows away from the tip _______ inch. (Oxygen needle valve is closed)

Answer 26

1/4”