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1st Year Welding > 101 > Flashcards

101 Flashcards

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Welding Inspection Basics flashcards
1
Q

What is plasma?

A

Super heated gas which causes the gas to ionize, this is considered a 4th state of matter

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2
Q

What polarity does PAC use?

A

Straight polarity(DCEN)

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3
Q

When talking about PAC, what is dross?

A

Re-solidified oxidized molten metal

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4
Q

Which type of CAC-A is the most economical electrode? Why?

A

Large diameter DC copper coated electrode because you can have continuous operation without stub loss

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5
Q

What PSI do you run compressed air when using CAC-A

A

80PSI- 100PSI (550KpA- 700KpA)

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6
Q

What is the maximum stickout with CAC-A?

A

7” maximum

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7
Q

What is the problem if the main hoist line hangs off centre to the raised boom?

A

The crane is not Level

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8
Q

If a signalman has one thumb up and is bringing his fingers in and out what does this signal mean?

A

Boom up load down

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9
Q

Why are synthetic ropes stronger than natural fibres?

A

Because they have no breaks in threads and strands

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10
Q

What is WLL (working load limit)?

A

The weight that can be safely lifted by a wire rope

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11
Q

What safety factor must be used when lifting people?

A

10:1

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12
Q

What does ANSI mean?

A

American national standards institute

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13
Q

What hold acetylene in solution?

A

Acetone

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14
Q

How do you know the contents of a air bottle?

A

By reading the label (not the colour of the bottle)

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15
Q

What is not considered a part of the regulator?

A

The dials

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16
Q

Where are flashback arresters placed?

A

At the regulators

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17
Q

What is the average pressure limits on hose lines?

A

400 PSI

18
Q

When using a oxy-fuel heating torch what is the difference in flame from a cutting flame?

A

When setting the acetylene you must be out of the smoke range

19
Q

While cutting with an oxy-fuel torch if the top edge of the metal is gone behind the cut what is the likely cause?

A

Either the pre-heat flames are too long or to close to the plate, or it is set to an oxidizing flame

20
Q

What ferrous metals can not be satisfactorily cut with an oxy-fuel torch?

A

Cast iron, and stainless steel

21
Q

If there are three tubes running to the tip of a cutting torch what kind of torch is it?

A

A tip mixing torch

22
Q

what is a benefit of machine oxy-fuel cutting?

A

High degree of accuracy and repeatability

23
Q

What is a scarfing tip used for?

A

Removes minor imperfections during foundry and casting work

24
Q

When cutting thin material what must you change during cutting?

A

Inclination

25
Q

What are the three key elements of WHMIS?

A

Worker education, product labelling, and MSDS

26
Q

What classification and classes does WHMIS cover?

A 
Compressed gases (Class A), flammable materials (Class B), oxidizing materials (Class C), poisonous and hazardous materials (Class D),
Corrosive materials (Class E), dangerously reactive materials (Class F)
27
Q

Who supply’s the MSDS?

A

The supplier, anytime a hazardous material is shipped it must be accompanied by a MSDS

28
Q

How must gas cylinders be transported?

A

Tightly and properly secured in an upright position

29
Q

What must be done before entire a confined space?

A

Make note of egress locations and check oxygen and hazardous gas levels with a gas detector (sniffer)

30
Q

What is the minimum number times air must be changed in an hour?

A

4 times an hour

31
Q

What is the lower explosive limit?

A

The minimum concentration of a flammable gas required for a flas or explosion with an ignition source

32
Q

What are the components of the fire triangle?

A

Fuel, air(oxygen), ignition source(heat)

33
Q

What is a class d fire?

A

Combustible metals

34
Q

What is the supplier label attached to?

A

The container that a hazardous material is shipped in

35
Q

What causes arc eye?

A

Ultra-violet light

36
Q

When working in a public environment who’s responsibility is it to protect the public from adverse effects of welding?

A

The welder, use screens and warning signs

37
Q

How do you treat hypothermia?

A

Raise body temperature, using warm decaffeinated drinks, and warm clothing

38
Q

What is the maximum decibel level that you can work for eight hours without hearing protection?

A

85 decibels

39
Q

When cutting with oxy-fuel what shade range do you use?

A

Shade #4-#6

40
Q

If after welding you see little light spots what is the likely cause?

A

Using a shade level too low for the process you’re using

41
Q

What does PASS stand for?

A

Pull the pin
Aim the nozzle
Squeeze the trigger
Sweep

1st Year Welding (2 decks)

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