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問題一覧
1
When vertically lifting components, NEVER use a _______ ?
come-along
2
Clips, yokes, and wedges are generally ______ ?
field-fabricated
3
A simple shop-built clasp made from angle iron can help align _____ ?
small pipes
4
Hi-Lo guages measure _____ ?
the difference between two surfaces
5
A clamped weldment that distorts when you release the clamping device likely has a problem with _____ ?
residual stress
6
What is an appropriate way to protect the root pass from corrosion an open-root pipe groove weld?
use gas backing
7
Always attach a chain hoist to a suitable support such as a _____ ?
structural member
8
What is the main advantage of cage clamps with arched crossbars?
they give better access to the weld joint
9
Which tool can confirm that a weldment component is plumb?
level
10
What can cause a weldment component's shape to change?
non-uniform expansion or contraction
11
Which of the following causes greater stress when a joint contains more weld metal?
shrinkage
12
If a joint requires a significant holding force, Welders may combine wedges and yokes with a _____ ?
strongback
13
What must you NEVER do when creating a pipe socket weld?
bottom out the pipe in the socket
14
To see if a pipe flange is level before welding it, check it with a evel supported by _____ ?
pins
15
Hi-Lo guages are useful for checking _____ ?
pipe internal alignment
16
A material that transfers heat easily will have a large _____ ?
thermal conductivity value
17
A full load is _____ ?
the part's weight, joint's weight, and hoist's weight
18
NEVER attach a chain hoist or chain fall to piping, conduits, ducts, or _____ ?
raceways
19
The jack height and sometimes head width are adjustable on a _____ ?
pipe jack stands/rollers
20
OSHA requires 4-legged jack stands for pipes over _____ ?
10"
21
Cracking in or a chunk of base metal is called _____ ?
lamellar tearing
22
What clamp can re-form an out of round pipe up to schedule 40 thickness?
single-jackscrew clamp
23
Which clamp is used throughout the entire welding process?
rim clamps
24
What's good for securing 2 straight pipe sections?
cage clamps
25
Prefabricated filler metal designed to fuse weld roots and become part of the weld is a _____ ?
consumable insert
26
What is a joint mismatch?
alignment discrepancy in pipe sections or plates, also known as Hi-Lo
27
Heating makes metal grow in each dimension, called _____ . Cooling makes metal shrink, called ____ .
expansion, contraction
28
What is distortion?
changes in a welded assembly's shape caused by its parts changing size as the weld joint is heated and cooled
29
The *ultimate tensile strength* is _____ ?
a metal's stretching limit
30
What are major factors that contribute to distortion and stress?
fit up, alignment, welding process, and the welder's technique
31
A number indicating by how much a material's length changes in response to a 1°C temperature change is a _____ ?
coefficient of linear thermal expansion
32
A number indicating how readily a material transfers heat is a _____?
thermal conductivity value
33
Which ring is this?
split ring with buttons
34
Consumable inserts usually require which joint preparation?
v-groove & j-groove