Oxy Fuel Equipment and arc welding

Question 0

What is the best type of clothing used for brazing and cutting?

Answer 0

Leather

Question 1

Goggles are worn when cutting and brazing to protect the eyes from?

Answer 1

Light rays, heat Rays, Sparks and slag

Question 2

The most suitable footwear for cutting and brazing is

Answer 2

Hightop leather safety boots

Question 3

What three elements are necessary for a fire to occur

Answer 3

Fuel heat oxygen

Question 4

What type of fire extinguisher should be used in a class C fire

Answer 4

Dry chemical

Question 5

What is the purpose of the disc that is mounted on one side of the oxygen cylinder valve

Answer 5

The rupture disc is a safety device designed to burst at 3200 psi and allow the slow controlled escape of gas

Question 6

When oxygen is being used the cylinder valve should be opened?

Answer 6

Fully

Question 7

The maximum safe working pressure for acetylene is

Answer 7

15 psi

Question 8

What does the term draw limit mean

Answer 8

The maximum amount of acetylene that can be drawn from the cylinder without drawing liquid acetone

Question 9

Fusible plugs in acetylene cylinders are located where

Answer 9

On the shoulder and on the bottom of the cylinder

Question 10

The acetylene cylinders must be used in what position

Answer 10

In a vertical position

Question 11

Testing for leaks on Oxyacetylene equipment should be done with

Answer 11

Leak detection fluid

Question 12

What color is the acetylene hose used with Oxyacetylene equipment

Answer 12

Red

Question 13

The function of a regulator in Oxyacetylene equipment is too?

Answer 13

Reduce cylinder pressure to working pressure

Question 14

A fully charged oxygen cylinder his how much pressure?

Answer 14

2200 PSI

Question 15

Which is darker? A number four or a number five lens?

Answer 15

Number five

Question 16

What is the critical point of acetylene?

Answer 16

28 psi

Question 17

What is the melting point of a fusible plug on an acetylene tank?

Answer 17

100 c or 212 f

Question 18

How do you check for leaks on Oxyacetylene equipment?

Answer 18

With in oil free leak detection fluid

Question 19

Flat faced fittings found on some acetylene regulator stems must be installed with what?

Answer 19

A fiber washer

Question 20

5 uses for carburizing flames are?

Answer 20

Hard surfacing

Aluminum brazing

Silver Brazing

Fusion welding alloy and mild steels

Fusion welding medium and high carbon steels

Question 21

Which area of the torch is susceptible to backfires?

Answer 21

The tip and mixer

Question 22

One cause of a flashback in Oxyacetylene equipment is?

Answer 22

Grossly unequal pressures

Question 23

In Oxyacetylene cutting the pressure at the regulators is relevant to?

Answer 23

The tip size and the thickness of the material to be cut

Question 24

In silver brazing the filler metal fills the joint by?

Answer 24

Capillary attraction

Question 25

To produce a high strength joint with silver brazing the joint clearances should be?

Answer 25

.001-.005 inch

Question 26

One of the principal functions of flux for silver brazing is to?

Answer 26

Absorb and remove oxides

Question 27

The type of flame used for braze welding of cast iron is?

Answer 27

Neutral to slightly oxidizing

Question 28

Is propane heavier or lighter than air?

Answer 28

Heavier

Question 29

What is constructed of two dissimilar metals that when heated discharge a small electrical current?

Answer 29

A thermocouple

Question 30

What lens shade is recommended for low to medium amperage arc-welding?

Answer 30

Number 10

Question 31

When welding is performed on machinery what do you do to protect the bearings?

Answer 31

Please the ground clamp as close to the weld as possible

Question 32

If a short arc is used is the penetration shallow or deep?

Answer 32

Deep

Question 33

In order to set a DC welding machine to run with reversed polarity what will the electrode be connected to?

Answer 33

Electrode connected to the positive terminal in the work grounded to the negative terminal

Question 34

What is the main reason for the coating on stick electrodes?

Answer 34

To produce an inert atmosphere that protects the molten weld pool

Question 35

Define GMAW

Answer 35

Gas metal arc welding

Question 36

Define SMAW

Answer 36

Shielded metal arc welding

Question 37

What are three welding power sources?

Answer 37

Transformers, inverters, and generators

Question 38

What is the main cause of arc blow?

Answer 38

Extensive DC welding done at high heat (high amperage)

Question 39

What welding rod is commonly used for checking polarity?

Answer 39

E6010 electrode

Question 40

What are the two methods used for starting or striking the arc when stick welding?

Answer 40

The tapping method or the scratch method

Question 41

What are the three harmful rays that are encountered when Oxyacetylene heating?

Answer 41

Visible light rays, UV light rays, infrared rays

Question 42

Which metals require respirators when heating?

Answer 42

Materials containing zinc, cadmium, or lead

Question 43

Are oxygen connections right or left-handed threads?

Answer 43

Right hand threads

Question 44

What is the explosive mixture of acetylene in air range?

Answer 44

2.5%-80%

Question 45

Why is an oxygen cylinder valve opened all the way during use?

Answer 45

Because it has a double seated valve

Question 46

What is the pressure of a fully charged acetylene tank?

Answer 46

250 psi

Question 47

Do acetylene cylinders valves use a left-hand or right-hand thread?

Answer 47

Left-hand thread

Question 48

What is the disadvantage of a single stage regulator?

Answer 48

It does not provide fine control of delivery pressure

Question 49

Besides finer control of delivery pressure what is another advantage of a two stage regulator?

Answer 49

It is not affected by cold temperatures to the same degree as a single stage regulator

Question 50

What is regulator creep?

Answer 50

When the valve on the high-pressure side of the regulator does not seat properly and gas is allowed to leak past raising its pressure above normal

Question 51

Why should you never use copper or red brass fittings with acetylene?

Answer 51

Copper can chemically react with the acetylene and create heat. Acetylene fittings must be yellow brass iron or steel

Question 52

What are some causes of backfires?

Answer 52

Too little gas speed, obstruction of gas flow, a dirty tip, a hot tip, loose or faulty seat connections between the tip and torch handle

Question 53

How do you start a cut on a round workpiece?

Answer 53

Use a chisel to form a nick to start the cut

Question 54

Do thinner materials require more or less inclination for cutting?

Answer 54

More inclination

Question 55

What are two methods for piercing holes in metal with a torch?

Answer 55

Traveling torch method and the still torch method