Shop Flashcards
What metals can be cut using a plasma arc ?
Almost all metals
What is the plasma cutting process?
Process that uses a high velocity jet of ionized gas delivers from a constricting orfice
What is a computerized duct lay out program ?
Program linked with the plasma cutter that often has hundreds of preprogrammed basic and complex fitting shapes. Is capable of mitring reducing and dimensions as well as select seam placement. Selecting the template allows you to enter all dimensions you may require. Once you have finished u click auto nest and the computer will automatically nest the material for the least amount of wasted
What is a standard component library ?
Includes items such as
Lifting lugs
Belt guards
Flanges
Gussets
Can housing
Augers
Can you design your own labels ?
Yes you can to use later to extract critical info for estimating shipping and assembly
What are some safety practices when operating the plasma ?
Long sleeve
Gloves
Eye protection (dark goggles or welding mask)
Shade of 7 or 9 is acceptable
What is the nozzle in place safety feature?
An arc will not start unless the nozzle is in place
What is another consideration when purchasing a plasma ?
Look for machine that provides pre flow sequences
What are the 5 components of the plasma ?
Shield
Retains cap
Nozzle
Electrode
Swirl ring
What are the consumables on a plasma machine ?
Electrode
Nozzle
What guidelines should you follow when selecting a machine
Determine metal thickness
Select best cutting speed
Look for portability factor
Determine durability
If you cut thick metal what amperage machine should you get ?
A high amperage machine
What is the cutting speed measured in ?
Inches per minute
What is kerf ?
The void created by plasma cutting process or the amount of metal removed by the plasma
Changes due to every factor
What is kerf angle ?
Kerf width and bevel angle
How are nozzles sized for plasma ?
According to amperage rateing
What if kerf angle is too wide ?
Meaning that the part is to small it can be caused by
Worn nozzle
High torch standoff
Excessive amperage
Inadequate gas flow or low speed
What if kerf angle is too narrow ?
Low torch standoff
Excessive gas flow or high speed
What is a bevel angle ?
The angle of the cut edge.
A cut with zero degree bevel is a straight cut
Typically bevel angles range from 1-3 on the good side of the cut and 3-8 on the bad side
What would cause a positive and negative and irregular bevel ?
Positive = high torch standoff Excessive off worn nozzle excessive speed
Negative= caused by low torch standoff excessive amperage or low speed
Irregular = means the nozzle has failed
What is dross ?
Molten metal that had hardened before it was ejected from the cut
Slag/ bur
What happens when the chromium content exceeds 11% on stainless steel?
An invisable film is formed and protects the material
Can stainless steel rust and if so how ?
Yes when the film is contaminated by iron
What elements can be in stainless steel ?
Chromium
Nickle
Manganese
Molybdenum
Carbon