Oxyfuel

Brazing and braze welding filler metal melts at temperatures above ____, but below the melting temperatures of the base metal

• 840F
• 1200F
• 1945F
• 2000F

Oxyfuel gas cutting (OFC) is a process  used to cut metal by rapidly oxidizing it or burning it

• True
• false

A carburizing flame is produced when too little oxygen is present and three flame areas are present 

• True
• False

Bell mouth kerf is produced when too little oxygen is used

• True
•  False 

The brazing process draws filler metal through the ___ action

• Brazing
• chemical
• capillary
• combination

A full oxygen tank contains approximately 

• 2200 psi
• 212 psi
• 250 psi
• 400 psi

Why are spark lighters or strikers used instead of matches or butane lighters to light the gases at the torch

• They are faster
• They are cleaner
• They are safer and prevent the welder from burning his / her fingers
• the are cheaper to operate

Filter lenses for goggles come in shade from #1 to #14. what # lens should be worn when OFC

• 4-6
• 2-4
• 6-8
• 10-12

a(n) ____ flame has a smooth, bullet shaped inner cone

• neutral
• carburizing 
• oxidizing 
• cutting

The _____ must be closed before the cylinder valves are opened

• Regulators
• Oxygen cutting lever
• Flashback arrestors
• guages