Oxy-fuel Ect.

Question 0

What are three harmful rays that can be encountered when heating brazing and cutting

Answer 0

Visible light rays, ultraviolet light rays, infrared rays

Question 1

What is the best clothing material for welding and cutting list 4 and why

Answer 1

Wool, leather, denim and cotton because they repel sparks

Question 2

For welding cutting and brazing goggles what are the number systems for

Answer 2

Darkness of the lense

Question 3

What are the three elements to start a fire

Answer 3

Heat fuel and oxygen

Question 4

What are the four classes of fire

Answer 4

Class A wood and paper
Class B flammable liquids
Class C electrical
Class D combustible metals

Question 5

Why should you not cut over concrete floors

Answer 5

Because small explosions happen when slag hits the floor

Question 6

When should you have adequate ventilation

Answer 6

When heating cutting or using Oxyacetylene equipment

Question 7

When should you use an approved airline respirator

Answer 7

When heating or cutting metals that contains zinc

Question 8

Why should oxygen be considered a potential danger

Answer 8

Because it can promote burning or cause explosions

Question 9

What is a new oxygen cylinder fully charge to and at what temp.

Answer 9

2200 psi

70°F ( 21°C )

Question 10

Normally steel is not considered to be a combustible material although oxygen and moisture slowly oxidize steel in a process known as…..

Answer 10

Rusting

Question 11

Oxygen cylinders are factory tested to 1 1/2 times working pressure what is that in PSI

Answer 11

3360 PSI

Question 12

What causes the oxygen cylinder rupture disk to release

Answer 12

Extreme pressure rise caused by heat or fire

Question 13

At what psi does the rupture disk on an oxygen cylinder valve burst at and is it a slow or a fast release of gas

Answer 13

3200psi

Slow controlled release

Question 14

What are two key properties of acetylene

Answer 14

Colorless and a strong pungent odor

Question 15

What is the percentage range of the explosive mixture of acetylene in air

Answer 15

2.5%-80%

Question 16

What is the maximum safe working pressure for acetylene

Answer 16

15 psi

Question 17

What psi can acetylene cylinders be safely stored at

Answer 17

250psi

Question 18

What is the percentage of acetone in an acetylene cylinder

Answer 18

40%

Question 19

What position must oxygen and acetylene cylinders be stored in

Answer 19

An upright position

Question 20

What does a draw limit mean

Answer 20

It means the maximum amount of acetylene can be taken from the cylinder without drawing acetone

Question 21

What is the purpose of a fusible plug and what temperature does it melt at

Answer 21

To melt out in case of a fire allowing a slow controlled escape of gas
212°F (100°C)

Question 22

Acetylene cylinder valves use what hand thread

Answer 22

Left hand thread

Question 23

Oxygen cylinder valves use what hand thread

Answer 23

Right hand thread

Question 24

What is the suggested amount of turns to open an acetylene valve

Answer 24

1-1/2--2 turns

Question 25

How many turns should you open an oxygen cylinder valve and why

Answer 25

All of the way because it has a double seated valve

Question 26

What should you do when mounting and oxygen and acetylene cylinder so they don't get banged into or knocked over

Answer 26

Secure them with chain and position them so this doesn't happen

Question 27

What are three characteristics of an argon gas

Answer 27

Colorless odorless and tasteless

Question 28

What is argon used for in industry

Answer 28

Purging purposes

Question 29

What kind of metals are used when using argon and carbon dioxide as a shielding gas

Answer 29

Mild steel low alloy steel and sometimes stainless steel

Question 30

What kind of metals can be welded with argon and helium being the shielding gas

Answer 30

Non-ferrous metals

Question 31

What is the purpose of the regulator for an oxygen and acetylene cylinder

Answer 31

To reduce the cylinder pressure to a usable working pressure

Question 32

What color are oxygen regulators

Answer 32

Green

Question 33

What color are acetylene regulators

Answer 33

Red

Question 34

What is the difference between a single stage and a two stage regulator

Answer 34

Single stage only shows the operating pressure | two stage shows cylinder pressure and operating pressure

Question 35

What is the minimum bursting pressure of oxyacetylene hoses

Answer 35

400psi

Question 36

What do flashback arrestors do

Answer 36

Prevent flames from traveling in gases back from the torch to the regulator

Question 37

Define a welding torch

Answer 37

A device that mixes oxygen and acetylene in the correct portions for oxyacetylene welding and cutting

Question 38

What kind of material are oxyacetylene welding tips made out of

Answer 38

Copper

Question 39

What are heating tips used for

Answer 39

``` Bending straightening preheating shrink Fits bronze welding ```

Question 40

For every Oxyacetylene tip size you should do what to the psi

Answer 40

Add one psi

Question 41

What are the three main types of cutting torches

Answer 41

Combination welding heavy duty hand cutting torch machine torches

Question 42

What is the first procedure to do when setting up oxygen and acetylene cylinders

Answer 42

Lash the cylinders together securely with chain or holding device

Question 43

What is a backfire

Answer 43

The flame backs up into the tip and mixer with a pop or bang

Question 44

What is burnback

Answer 44

A hot tip | faulty mixture and torch body seats

Question 45

What are suitable materials for cutting

Answer 45

Ferrous metals such as steel

Question 46

What are not suitable materials for cutting

Answer 46

``` Nonferrous metals such as Copper brass bronze aluminium ```

Question 47

What kind of flame should you have when checking preheat flames and cutting jetstream

Answer 47

Neutral

Question 48

Where should you start a cut when using a torch

Answer 48

sharp edge on a projection or at a whole where preheating will be easiest and fastest

Question 49

Should your torch inclination be more or less when cutting into a thicker material

Answer 49

Less

Question 50

What are drag or lag lines

Answer 50

Lines that are caused by the jetstream while cutting of the workpiece takes place

Question 51

Describe a neutral flame

Answer 51

A point where the feather just disappears but no more

Question 52

Uses for a neutral flame

Answer 52

``` Fusion welding aluminum low-carbon steels cast iron Brazing ```

Question 53

What is an oxidizing flame

Answer 53

Any flame Richer in oxygen than neutral flame

Question 54

What is Capillary action or attraction

Answer 54

And liquid is drawn and spread through a very small space between two surfaces

Question 55

What are two metals for EasyFlo brazing

Answer 55

Ferrous and non-ferrous metals

Question 56

Flux is used for what

Answer 56

Brazing

Question 57

How should you braze a pipe joint

Answer 57

Preheat the pipe then heat the joint while applying alloy to the corner of joint and pipe

Question 58

Why should you remove all traces of flux after silver brazing

Answer 58

Because it has a residue which is chemically corrosive

Question 59

What should the minimum included angle be in a joint design

Answer 59

90°

Question 60

What is a possible tensile strength when breeze welding

Answer 60

60,000psi

Question 61

What is a tiger torch

Answer 61

A heavy duty torch used in construction and maintenance shops for applications requiring intense heat

Question 62

What hand are the internal threads on a propane tank

Answer 62

Left hand thread

Question 63

What are temperature indicators used for

Answer 63

Preheating or component assembly