Oxy-Acetylene Cutting

Problem: This activity will require you to cut a 45-degree angle (bevel), a 90-degree angle, and cut out a 1" diameter circle freehanded.

Materials:

• • 1- 1/4in. X 3in. X 3in. hot-rolled steel plate
• • cutting attachment
• •striker
• •chipping hammer
• •wire brush
• •combination square

Directions:

• • Secure metal
• • Use soapstone and combination square to mark cut locations
• •Cut 1" off the top as indicated.
• • Position and cut 45-degree angle and 1" diameter circle as indicated.
• • Cool metal thoroughly.
• • Clean cuts with chipping hammer and wire brush.
• • Use masking tape provided to tape your score card to the metal.
• • Submit work and this sheet to contest official.

Oxy Identification and General Questions @ 1 point each.

1. The part tagged #1a is a/an:

a. hand wheel

b. bursting disk

c. cylinder pressure gauge

d. cylinder cap

2. Balsa wood is found in the tank labeled:

a. 2a

b. 2b

3. Name the flames. (Carburizing, Neutral, Oxidizing)

a.) _______________ b.) _______________ c.) _______________

4. Which flame is the most affective for cutting mild steel?

A. Neutral

B. Carburizing

C. Oxidizing

5. What are two causes of backfire?

_________________________________________________________________

_________________________________________________________________

6. Right hand threads can be found on the tank labeled:

a. 2a

b. 2b

7. You can use which device to properly light an oxy-acetylene torch unit:

a. spark lighter

b. cigarette lighter

c. match

8. The part labeled #3 is:

a. cylinder valve

b. oxygen cylinder valve

c. hand wheel

d. oxygen regulator

9. Which of the following lenses is suitable for oxy-acetylene welding?

• lens A
• lens B
• lens C
• lens D

10. What is the approximate ratio of oxygen to acetylene used when cutting a 1/4" piece of mild steel?

a. 1/10

b. 1/5

c. 1/3

d. 1/1