Cutting

Question 1

What pressure should your gases be at for cutting?

Answer 1

Acetylene - 5psi
Oxygen - 30-40psi (depending on thickness of steel)

Question 2

when flame cutting, if travel speed is correct, _______ ______will lead the cut

Answer 2

bottom sparks

Question 3

How does flame cutting cut?

Answer 3

By rapidly oxidizing the metal

Question 4

What kind of flame do you want?

Answer 4

Neutral

Question 5

What should be checked if it is not producing a clean cut when flame cutting?

Answer 5

check tip cleanliness and gas pressures

Question 6

How is plasma created?

Answer 6

produced when a conducting gas is passed through an electric arc

Question 7

How hot can plasma cutting get?

Answer 7

Temperatures in plasma cutting operations can reach 27,500C (50,000F) and beyond

Question 8

__________ torches can cut ferrous and non-ferrous metals. An _________ cutting torch can cut ferrous metals only

Answer 8

The plasma torch can cut ferrous and non-ferrous metals. The oxyacetylene cutting torch can cut ferrous metals only

Question 9

What are the two types of tips which may be used on a plasma torch?

Answer 9

Contact tip (designed to be dragged across the surface in contact with the stock)
Standoff tip (must not contact the material being cut)

Question 10

Explain how plasma cutting works.

Answer 10

Uses compressed air and strips off its electrons, converting it to plasma
* The torch projects the plasma against the conductive material to be cut (grounded!)
* When the plasma hits the material it melts; the melted material is blown away by the
force of the moving plasma leaving a hole or gap.

Question 11

What is the kerf size for plasma cutting?

Answer 11

can be ~.040”

Question 12

What is the only adjustment when plasma cutting?

Answer 12

Amperage
Higher amperage for thicker material or faster feed rate
Slow cut on thin material = very low amperage