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2nd Year Welding > 202 > Flashcards

202 Flashcards

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Welding Inspection Basics flashcards
1
Q

How high can GTAW welding temperatures reach?

A

19427^C (35000^F)

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2
Q

What’s is shielding gases primary use?

A

To protect the weld from atmospheric contamination

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3
Q

What are the four types of GTAW welds?

A

Spot welding, hot wire GTAW, cold wire GTAW, high amperage GTAW

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4
Q

What is hot wire GTAW?

A

It’s a mechanized process which feeds wire directly into the puddle, resistance heating preheats the filler metal to a near molten using a separate AC power supply

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5
Q

What do hot wire and cold wire GTAW have in common?

A

They are both mechanized processes

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6
Q

What is a common use of high-amperage GTAW process?

A

It is often used to weld root passes in a carbon steel pipe

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7
Q

What gas is used with the GTAW process?

A

100% Argon

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8
Q

At what speed will fans or drafts blow the protective gas envelope away?

A

50 CFM (cubic feet per minute)

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9
Q

What are the 6 key items that the GTAW process requires?

A

Welding power source, welding torch assembly, work lead, non-consumable tungsten electrode, shielding gas, filler metal (if required)

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10
Q

Why must you have post purge settings with GTAW?

A

It protects the tungsten electrode from deterioration due to oxidation

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11
Q

What happens during the peak of a pulsed current?

A

It’s the period of time when penetration and metal flow occur

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12
Q

What is the average range for amount of pulses per minute?

A

2-10 pulses per minute

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13
Q

When using pulsed GTAW on stainless what is the depth to width ration of the weld?

A

2:1

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14
Q

When GTAW welding with out using a filler wire what is this called?

A

Autogenous welding

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15
Q

What are the power source options for GTAW?

A

Transformers, transformer/rectifier, generators, or inverter type welding machine

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16
Q

What metals are commonly welded with AC when GTAW welding?

A

Magnesium and aluminum

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17
Q

Define amperage

A

Measure if the number of electrons that flow past a given point in one second

18
Q

Define voltage

A

Pressure needed to push the electrons through the conductor

19
Q

What is the most common gas nozzle? Why?

A

Ceramic gas nozzles are the most common because they are the least costly

20
Q

How are gas nozzles sized?

A

They are sized by 1/16”, a number 6 is 6/16”

21
Q

What do gas lenses allow for?

A

Shielding gas to flow in a laminar fashion (arranged in thin layers)

22
Q

Why is the chemical symbol for tungsten W?

A

Cause the German term for tungsten is wolfram

23
Q

What direction should grinding marks run on a tungsten electrode?

A

Longitudinal

24
Q

What kind of tungsten is used with aluminum?

A

Pure tungsten

25
Q

What are the factors that influence choice of welding filler?

A

Required mechanical and physical properties, joint design, and required finish or appearance of the welded part

26
Q

Why can’t you use a mild steel brush on aluminium?

A

Because it may deposit carbon into the weld area

27
Q

What affect does the nickel added to stainless steel have on the weld puddle?

A

It becomes much more fluid

28
Q

What kind of stainless steel is a 300 series?

A

Austenitic stainless steel

29
Q

Why can titanium be used in tig versus other process?

A

Because titanium burns up if crossed through an open arc, it’s used to stabilize the weld puddle

30
Q

What does appropriate stick out do for the GTAW process?

A

Maintains gas shield around the electrode and molten weld metal

31
Q

Three ways to strike an arc in GTAW?

A

Touch start, high frequency start and lift start

32
Q

Name 5 components of a GTAW cable and torch assembly?

A

Torch handle and head, gas control valves, cable covers, nozzles, collet and collet body, gas lens, and electrode

33
Q

Name two safety devices on a water cooled torch?

A

A fuse link (if coolant is lost this cause the fuse to melt and stops the system) and coolant flow safety interlock system, this systems tells if there is water flowing through the torch

34
Q

Why would there be a gas control on the torch?

A

If there are no solenoid valves used

35
Q

When is GTAW preferred?

A

When the highest possible quality welds for the more critical weld applications

36
Q

At what speed will a draft blow away the protective gas envelope?

A

50 surface feet per second

37
Q

What does pulse current control?

A

It controls the high(peak) and low (background) currents

38
Q

What is an advantage of pulsed GTAW?

A

Greater control of heat input

39
Q

What is orbital GTAW?

A

It’s is a semi and fully automatic welding process in which a welding arc travels 360 degrees around a work price with interruption

40
Q

What metals is DCEN generally used on?

A

Ferrous metals

2nd Year Welding (3 decks)

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