Cutting Chapter 5

Question 1

All base materials should be what before welding?

Answer 1

Cleaned

Question 2

New materials are clean if they look clean

Answer 2

F

Question 3

The most common defect caused by surface contamination is

Answer 3

Porosity

Question 4

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

Answer 4

Pockets or Voids

Question 5

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

Answer 5

Wire brushes

Question 6

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

Answer 6

Stainless steel

Aluminum

Question 7

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

Answer 7

only on aluminum.

Question 8

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

Answer 8

contaminate the surface with mild steel, causing welding defects.

Question 9

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

Answer 9

Angle Grinders

End Grinders

Question 10

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

Answer 10

Surfacing

Question 11

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

Answer 11

F

Question 12

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

Answer 12

T

Question 13

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

Answer 13

Plug and slot welds.

Question 14

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

Answer 14

Lap
Corner
T-joints

Question 15

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

Answer 15

single V-groove.

Question 16

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

Answer 16

single V-groove.

Question 17

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?

Answer 17

60 degrees

1/8”

Question 18

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

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

Answer 18

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

1/8”

Question 19

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.

Answer 19

3/8” thick

3” wide

Question 20

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?

Answer 20

weld out of position.

Question 21

Always try to position the weldment so that the what

Answer 21

welding is performed in the flat position.

Question 22

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

Answer 22

Welding code

Question 23

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

Answer 23

Mechanical joint preparation

Question 24

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

Answer 24

F, Slower

Question 25

Mechanical joint preparation has the advantages of 3 things

Answer 25

high precision

low heat input

the absence of oxides commonly left by thermal methods.

Question 26

Various models are available to cut and bel…

Answer 26

2” to 60” pipe

Question 27

For larger pipe (54” or larger)

Answer 27

Special internal equipment is available.