Cutting Chapter 5 Flashcards

1
Q

All base materials should be what before welding?

A

Cleaned

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2
Q

New materials are clean if they look clean

A

F

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3
Q

The most common defect caused by surface contamination is

A

Porosity

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4
Q

Porosity occurs when what or what appears in the weld metal.

A

Pockets or Voids

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5
Q

Used to remove paint and light-to-medium surface corrosion.

A

Wire brushes

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6
Q

Wire brushes with stainless steel bristles must be used to clean what and what (2things)

A

Stainless steel

Aluminum

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7
Q

When brushing aluminum , use stainless steel brushes that have been used….

A

only on aluminum.

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8
Q

If a standard wire brush with steel bristles is used, it will what

A

contaminate the surface with mild steel, causing welding defects.

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9
Q

Very effective in removing large areas of surface contamination. (2 types of grinders)

A

Angle Grinders

End Grinders

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10
Q

The only type of weld that is applied to just one base metal surface.

A

Surfacing

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11
Q

Surface welding is not used to build up a base surface that has become worn below the desired thickness or dimension.

A

F

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12
Q

Surface welding involves adding material to a base to increase its strength and stability.

A

T

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13
Q

Used to join metal pieces when the edges cant be welded.

A

Plug and slot welds.

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14
Q

The plug and slot weld can be applied to what 3 things?

A

Lap
Corner
T-joints

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15
Q

When possible, a double V-groove weld should be used in place of a what

A

single V-groove.

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16
Q

The double V-groove requres half the weld metal compared to the what.

A

single V-groove.

17
Q

For open root welds on PLATE, the groove angle should be what degrees, and the maximum size of the root opening and root face is what inches?

A

60 degrees

1/8”

18
Q

For open root welds on PIPE the groove angle is what 2 degrees.

The maximum size of the root face is how many inches?

A

60-or 75 degrees depending on the code or specification used.

1/8”

19
Q

The recommendation for a backing strip for welding mild steel up to 3/4” this is how many inches thick by how many inches wide.

A

3/8” thick

3” wide

20
Q

It is easier and faster to weld groove welds in the flat position and fillets in the flat or horizontal position than it is to what?

A

weld out of position.

21
Q

Always try to position the weldment so that the what

A

welding is performed in the flat position.

22
Q

A detailed listing of the rules and principles that apply to specific welded products.

A

Welding code

23
Q

Most often used on alloy steel, stainless steel and nonferrous metal piping or plate.

A

Mechanical joint preparation

24
Q

Mechanical joint preparation is faster than thermal methods such as oxyfuel, carbon arc and plasma arc.

25
Mechanical joint preparation has the advantages of 3 things
high precision low heat input the absence of oxides commonly left by thermal methods.
26
Various models are available to cut and bel...
2" to 60" pipe
27
For larger pipe (54" or larger)
Special internal equipment is available.