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ait section 1 Flashcards

(46 cards)

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1
Q

What does GMAW stand for?

A

Gas Metal Arc Welding

GMAW is a welding process that uses a continuously fed consumable solid wire electrode.

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2
Q

What type of electrode is used in GMAW?

A

A continuously fed consumable solid wire electrode

This electrode is melted to form the weld.

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3
Q

What provides shielding in GMAW?

A

An externally supplied shielding gas

This gas protects the weld from contamination.

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4
Q

Name two common shielding gases used in GMAW.

A
  • Argon
  • Carbon dioxide

These gases help to create a stable arc and protect the weld pool.

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5
Q

What is the most common polarity used in GMAW?

A

Direct current electrode positive (DCEP)

DCEP provides better penetration and a stable arc.

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6
Q

What happens if shielding gas coverage is poor in GMAW?

A

Porosity will occur in the weld

Poor coverage can lead to defects in the weld.

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7
Q

What metal transfer modes are used in GMAW?

A
  • Short-circuiting
  • Globular
  • Spray
  • Pulsed spray

These modes affect the characteristics of the weld.

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8
Q

Which GMAW transfer mode is best for thin material?

A

Short-circuiting transfer

This mode allows for lower heat input.

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9
Q

Which GMAW transfer mode produces the least spatter?

A

Spray transfer

This mode provides a smoother weld with less cleanup.

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10
Q

Can GMAW be used outdoors? Why or why not?

A

No, wind can blow away the shielding gas

This makes it difficult to maintain a stable arc.

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11
Q

What are two advantages of GMAW?

A
  • High deposition rate
  • Clean welds with minimal slag

These features make GMAW a popular choice for many applications.

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12
Q

What are two disadvantages of GMAW?

A
  • Sensitive to wind
  • Requires shielding gas equipment

These factors can limit its use in certain environments.

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13
Q

What type of materials is GMAW commonly used on?

A
  • Carbon steel
  • Stainless steel
  • Aluminum

GMAW is versatile and can be used on various metals.

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14
Q

What does FCAW stand for?

A

Flux Cored Arc Welding

FCAW is a welding process that uses a tubular wire filled with flux.

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15
Q

What type of electrode is used in FCAW?

A

A continuously fed tubular wire filled with flux

This design allows for self-shielding or gas-shielding.

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16
Q

What are the two types of FCAW?

A
  • Self-shielded (FCAW-S)
  • Gas-shielded (FCAW-G)

These types differ in their shielding methods.

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17
Q

Which FCAW process does not require shielding gas?

A

Self-shielded FCAW

This process relies on the flux within the wire for protection.

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18
Q

Why is FCAW commonly used outdoors?

A

It is less affected by wind than gas-shielded processes

This makes it suitable for outdoor applications.

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19
Q

What provides shielding in FCAW-S?

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A

Flux inside the wire

This flux protects the weld from contamination.

20
Q

What provides shielding in FCAW-G?

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A

Flux and an external shielding gas

This combination offers enhanced protection.

21
Q

What polarity is commonly used for FCAW?

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A

DCEP (some self-shielded wires use DCEN)

DCEP is preferred for better penetration.

22
Q

What is a major advantage of FCAW over GMAW?

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A

Higher deposition rate and better penetration

This makes FCAW effective for thicker materials.

23
Q

What is a disadvantage of FCAW?

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A

Produces slag that must be removed

This adds an extra step in the welding process.

24
Q

What industries commonly use FCAW?

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A
  • Structural steel
  • Construction
  • Heavy fabrication

FCAW is widely used in various heavy-duty applications.

25
What happens if **slag** is not removed between passes?
Slag inclusions may occur ## Footnote This can weaken the weld joint.
26
What does **MCAW** stand for?
Metal Cored Arc Welding ## Footnote MCAW uses a metal-filled tubular wire for welding.
27
How does MCAW differ from **solid wire GMAW**?
MCAW uses a metal-filled tubular wire instead of solid wire ## Footnote This allows for different welding characteristics.
28
Does MCAW produce **slag**?
Minimal slag compared to FCAW ## Footnote This reduces cleanup time.
29
What provides **shielding** in MCAW?
An externally supplied shielding gas ## Footnote This gas protects the weld from contamination.
30
What is a major **advantage** of MCAW?
Very high deposition rate with clean welds ## Footnote This makes MCAW efficient for production welding.
31
Compared to FCAW, how much **slag** does MCAW produce?
Very little slag ## Footnote This is beneficial for reducing post-weld cleanup.
32
What **polarity** is commonly used in MCAW?
DCEP ## Footnote This polarity is preferred for better penetration.
33
Why is MCAW often used in **production welding**?
High efficiency, high deposition, and minimal cleanup ## Footnote These factors contribute to its popularity in industrial settings.
34
Can MCAW be used **outdoors**? Why or why not?
No, shielding gas can be affected by wind ## Footnote This makes it less suitable for outdoor applications.
35
What materials is MCAW commonly used on?
* Carbon steel * Low-alloy steel ## Footnote MCAW is effective for these types of metals.
36
What does **SAW** stand for?
Submerged Arc Welding ## Footnote SAW is a welding process where the arc is covered by granular flux.
37
Why is it called **submerged arc welding**?
The arc is completely covered by granular flux ## Footnote This provides excellent protection for the weld.
38
What provides **shielding** in SAW?
Granular flux ## Footnote This flux protects the weld from atmospheric contamination.
39
Is the arc visible during **SAW**?
No, it is submerged under flux ## Footnote This makes it different from other welding processes.
40
What type of **electrode** is used in SAW?
A continuously fed consumable wire ## Footnote This wire is melted to form the weld.
41
What are two **advantages** of SAW?
* Very high deposition rate * Deep penetration ## Footnote These features make SAW efficient for large welds.
42
What is a major **limitation** of SAW?
It can only be used in flat or horizontal positions ## Footnote This restricts its application in certain scenarios.
43
Is SAW typically **manual** or **automatic**?
Automatic or semi-automatic ## Footnote This allows for consistent and efficient welding.
44
Why is SAW not suitable for **thin materials**?
Excessive heat input can cause burn-through ## Footnote This makes it less ideal for delicate work.
45
What industries commonly use **SAW**?
* Pipe welding * Pressure vessels * Heavy plate fabrication ## Footnote SAW is widely used in heavy industrial applications.
46
What happens to **unused flux** in SAW?
It can be recovered and reused ## Footnote This makes the process more economical.
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