Welding

Question 0

Fire requires what?

Answer 0

Fuel, heat, oxygen

Question 1

Name the 3 harmfull light rays?

Answer 1

Visible - eyes strain
Ultra Violet - burn or blister eye balls
Infrared - cataracts

Question 2

Classes of Fire

Answer 2

A-wood
B-Liquids
C-electric
D-combustibles

Question 3

In the event of Flashback what do you shut off first?

Answer 3

Oxygen

Question 4

What safety features do Oxygen tanks have?

Answer 4

• The tank is made from a single piece of steel with no seems.
• The cylinder valve is double seats (seals when fully open and fully closed) and the valve has a rupture disc that will burst if the pressure exceeds 3200 psi, allowing a slow release of gas

Question 5

Safety features of acetylene tanks?

Answer 5

-fusible plugs melt at 212 degrees F
-tank safety stored at 250 psi
-

Question 6

What is a Oxygen tank fully charged at?

Answer 6

2200 psi

Question 7

What gas is colourless but stinks?

Answer 7

Acetylene

Question 8

What gas is colourless, odourless and tasteless?

Answer 8

Oxygen

Question 9

Straight polarity - electrode negative

Answer 9

Electrode is connecting to the negative terminal

Question 10

Reverse polarity - electrode positive

Answer 10

Electrode is connected to the positive. Burns slower enabling deeper penitration

Question 11

What type of electrode do you use to check polarity

Answer 11

E6010

Question 12

What are 3 types if constant power sources?

Answer 12

Transformers
Inverters
Generators

Question 13

What is duty cycle?

Answer 13

Quality of components inside welder. Allows welding to operate at that percentage of its amperage

Question 14

What does voltage cause the electrode to do?

Answer 14

Flow in a conductor or cross a gap. It maintains the arc and puddle fluidity and flow

Question 15

What does amperage cause the electrode to do?

Answer 15

To melt. It is the heat for welding.

Question 16

What is a carbonizing flame and it’s used?

Answer 16

Rich in acetylene. Adds carbon. Hard surfacing, fusion welding of alloy steels and med - high carbon steels and brazing

Question 17

Two methods of piercing holes?

Answer 17

Travelling torch or still torch

Question 18

What are drag or lag lines?

Answer 18

Lines on the side of the work piece caused by the oxygen jet stream.

Question 19

What part of the torch is susceptible to backfires?

Answer 19

Tip and mixer

Question 20

What 2 things are put into an acetylene tank so the gas remains stable?

Answer 20

A porous filler mass and 40% of the tank is filled with acetone

Question 21

Four principle functions of Flux?

Answer 21

• prevent oxidization during heating
• absorb and remove oxides
• assist in the flow of the filler

Question 22

How is strength and size determined in a fillet weld?

Answer 22

• Strength from throat size of largest equal leg triangle.

- Size from length of the largest equal leg triangle