CAC-A
CAC-A Electrodes are made of
Carbon
What is the primary purpose of the secondary gas?
cools the torch
The cooling/shielding gas in an air-cooled torch flows between
the gas nozzle and the shielding cap
CAC-A should never be used on metals containing cadmium, lead or________
Beryllium
What is the safe working pressure for Acetylene?
15 PSI
This Metal should never be cut with CAC-A because it produces highly toxic fumes
Lead
Plasma is a gas that has been super heated to the point where it becomes
Ionized
Which plasma gas produces the best results on stainless steel?
Nitrogen
A welding power source used for CAC-A should have a minimum OCV of:
60V
What identifies a fuel line fitting
Groove in the nut
Filter lens shade recommended for most CAC-A applications.
#12
What part of the plasma torch constricts the plasma arc?
Cutting nozzle
PAC systems run this range of Open Circuit Voltage
120-400Volts
Which of the following must never be used as a compressed gas in CAC-A?
Oxygen
What cutting gas uses a 2 piece cutting tip
MAPP gas
CAC-A is commonly used to prepare what type of weld joint?
U-Groove
How do kerf widths in OFC compare to those in PAC
PAC is 2 times wider
The purpose of the pilot arc
Initiate the main arc for cutting
What is the recommended current setting for 1/4" in. DC carbon electrode?
200 to 400A
Which is more dangerous, backfire or flashback?
Flashback
What is one method to increase the depth of the groove being cut?
Decrease travel speed/change angle of electrode
On carbon steel less than 1" thick, the speed of PAC is ___________ than OFC
up to 5 times faster
Cutting nozzles are normally made of which material?
Copper
Which material (Hint: alloy we weld in this course), is PAC better than CAC-A for cutting?
Aluminum
The type of torch we are using in the shop
DAILY DOUBLE FOR BOTH NAMES
Two piece or combination