456A Oxyfuel Welding & Cutting

Question 1

What type of flame is produced when oxygen and acetylene are mixed in equal proportions?

Accepted Answer

Neutral flame

Answer

Carburizing flame

Answer

Oxidizing flame

Answer

Reducing flame

Question 2

What is the maximum allowable working pressure for acetylene in Canada?

Accepted Answer

103 kPa (15 psi)

Answer

35 kPa (5 psi)

Answer

70 kPa (10 psi)

Answer

207 kPa (30 psi)

Question 3

In Canada, what color is the oxygen hose used in oxyfuel equipment?

Accepted Answer

Green

Answer

Red

Answer

Black

Answer

Blue

Question 4

What is the primary purpose of a flashback arrestor in an oxyfuel system?

Accepted Answer

To prevent flame from traveling back into the hoses and cylinders

Answer

To regulate gas pressure at the torch

Answer

To mix oxygen and fuel gas in the correct ratio

Answer

To filter impurities from the gas supply

Question 5

Which type of oxyfuel flame is characterized by an acetylene feather between the inner cone and outer envelope, and is used for welding high-carbon steel?

Accepted Answer

Carburizing (reducing) flame

Answer

Neutral flame

Answer

Oxidizing flame

Answer

Balanced flame

Question 6

When lighting an oxyfuel torch, which gas valve should be opened and ignited first?

Accepted Answer

Acetylene (fuel gas)

Answer

Oxygen

Answer

Both simultaneously

Answer

Either gas can be opened first

Question 7

What distinguishes an oxyfuel cutting tip from a standard welding tip?

Accepted Answer

Cutting tips have a central cutting oxygen orifice surrounded by preheat holes

Answer

Cutting tips have a single large orifice only

Answer

Cutting tips are made of stainless steel

Answer

Cutting tips operate at higher acetylene pressure than welding tips