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Second Year Millwright > Oxy Fuel Equipment and arc welding > Flashcards

Oxy Fuel Equipment and arc welding Flashcards

0
Q

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

A

Leather

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1
Q

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

A

Light rays, heat Rays, Sparks and slag

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2
Q

The most suitable footwear for cutting and brazing is

A

Hightop leather safety boots

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3
Q

What three elements are necessary for a fire to occur

A

Fuel heat oxygen

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4
Q

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

A

Dry chemical

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5
Q

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

A

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

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6
Q

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

A

Fully

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7
Q

The maximum safe working pressure for acetylene is

A

15 psi

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8
Q

What does the term draw limit mean

A

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

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9
Q

Fusible plugs in acetylene cylinders are located where

A

On the shoulder and on the bottom of the cylinder

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10
Q

The acetylene cylinders must be used in what position

A

In a vertical position

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11
Q

Testing for leaks on Oxyacetylene equipment should be done with

A

Leak detection fluid

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12
Q

What color is the acetylene hose used with Oxyacetylene equipment

A

Red

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13
Q

The function of a regulator in Oxyacetylene equipment is too?

A

Reduce cylinder pressure to working pressure

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14
Q

A fully charged oxygen cylinder his how much pressure?

A

2200 PSI

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15
Q

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

A

Number five

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16
Q

What is the critical point of acetylene?

A

28 psi

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17
Q

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

A

100 c or 212 f

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18
Q

How do you check for leaks on Oxyacetylene equipment?

A

With in oil free leak detection fluid

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19
Q

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

A

A fiber washer

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20
Q

5 uses for carburizing flames are?

A

Hard surfacing

Aluminum brazing

Silver Brazing

Fusion welding alloy and mild steels

Fusion welding medium and high carbon steels

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21
Q

Which area of the torch is susceptible to backfires?

A

The tip and mixer

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22
Q

One cause of a flashback in Oxyacetylene equipment is?

A

Grossly unequal pressures

23
Q

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

A

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

24
Q

In silver brazing the filler metal fills the joint by?

A

Capillary attraction

25
Q

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

A

.001-.005 inch

26
Q

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

A

Absorb and remove oxides

27
Q

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

A

Neutral to slightly oxidizing

28
Q

Is propane heavier or lighter than air?

A

Heavier

29
Q

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

A

A thermocouple

30
Q

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

A

Number 10

31
Q

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

A

Please the ground clamp as close to the weld as possible

32
Q

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

A

Deep

33
Q

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

A

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

34
Q

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

A

To produce an inert atmosphere that protects the molten weld pool

35
Q

Define GMAW

A

Gas metal arc welding

36
Q

Define SMAW

A

Shielded metal arc welding

37
Q

What are three welding power sources?

A

Transformers, inverters, and generators

38
Q

What is the main cause of arc blow?

A

Extensive DC welding done at high heat (high amperage)

39
Q

What welding rod is commonly used for checking polarity?

A

E6010 electrode

40
Q

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

A

The tapping method or the scratch method

41
Q

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

A

Visible light rays, UV light rays, infrared rays

42
Q

Which metals require respirators when heating?

A

Materials containing zinc, cadmium, or lead

43
Q

Are oxygen connections right or left-handed threads?

A

Right hand threads

44
Q

What is the explosive mixture of acetylene in air range?

A

2.5%-80%

45
Q

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

A

Because it has a double seated valve

46
Q

What is the pressure of a fully charged acetylene tank?

A

250 psi

47
Q

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

A

Left-hand thread

48
Q

What is the disadvantage of a single stage regulator?

A

It does not provide fine control of delivery pressure

49
Q

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

A

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

50
Q

What is regulator creep?

A

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

51
Q

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

A

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

52
Q

What are some causes of backfires?

A

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

53
Q

How do you start a cut on a round workpiece?

A

Use a chisel to form a nick to start the cut

54
Q

Do thinner materials require more or less inclination for cutting?

A

More inclination

55
Q

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

A

Traveling torch method and the still torch method

Second Year Millwright (8 decks)

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