Cutting Chapter 9 Flashcards

1
Q

Used to maintain the temperature of the weld zone during the welding

A

Interpass Temperature Control

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2
Q

Quenching does not have much of an effect on low-carbon and mild steels because…

A

They dont contain much carbon

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3
Q

Quenching ——– and ——- carbon steels produces a hard and brittle crystalline structure.

It also reduces the metal’s toughness

A

Medium
High

T

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4
Q

Heavy plate and castings have a —– —- — —-that will cause the weld metal & adjacent base metal to quench unless they are adequately preheated

A

High Heat Absorbtion Capacity

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5
Q

Cause moisture in the weld zone to separate into hydrogen & oxygen

A

Welding Arc

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6
Q

The —– dissolves in the molten base metal, and the —— combines with other elements to form —–

A

Hydrogen
Oxygen
Slag

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7
Q

The hydrogen forms gas bubbles in the base metal along the weld boundary…

A

As the metal begins to cool.

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8
Q

Restricted joints, complex shapes, freezing temperatures and carbon content over .30 percent

A

Mild Carbon Steels

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9
Q

Low Carbon Steel (.1-.3 Percent) Shapes or Conditions

A

Freezing Temperatures

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10
Q

Low Carbon Steel (.1-.3 Percent) Preheat Temperature

A

Above 70’ F

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11
Q

During this, an alternating magnetic field is generated within the metal body being heated

A

Induction Heating

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12
Q

This thing is placed around the metal object, and a strong alternating current is passed through the coil

A

Magnetic Coil

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13
Q

Handheld device that measures temperature from the frequencies of the emitted electromagnetic waves of infrared or visible light.

A

Pyrometer

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14
Q

Noncontact instruments commonly used to measure temperature.

A

Optical Pyrometers

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15
Q

Devices that change form or color at specific temperatures or temperature ranges.

A

Temperature-sensitive indicators

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16
Q

Temperature-sensitive indicators include commercially made materials and devices such as 6 things

A
Crayon Sticks
Liquids
Chalks
Powders
Pellets
Labels
17
Q

When preheating is important, interpass temperature for multiple-pass welds is usually also important.

18
Q

Often simply a continuation of preheating.

Heating equipment and techniques arent the same

A

Interpass Temperature

F

19
Q

The most commonly used postheat treatment.

A

Stress Relieving

20
Q

Stress Relieving is done below the lower transformation temperature, usually in the range of…. to …..

A

1,050 F to 1200 F

21
Q

A process in which heat is applied to remove strain and reduce grain size.

A

Normalizing

22
Q

Normalizing is done at temperatures and holding periods comparable to those used in….

23
Q

Tempering is aka

24
Q

Increases the toughness of quenched steel and helps avoid breakage and failure of heat-treated steel.

25
Tempering is done at temperatures above the critical temperature.
F
26
Tempering is much lower than those used for ..3 things
Annealing Normalizing Stress Relieving
27
Tempering is commonly done to
tool steel
28
Parts that have been hardened using the cold forming process may look....
brighter in appearance
29
Electrical devices that often used to heat and relieve stress in metals
Ceramic Heating Elements
30
The individual ceramic components, or fingers, are threaded together as needed to cover the metal being heated.
The Heating Elements
31
Threaded through the individual ceramic fingers, and they heat the fingers when the power is applied.
Electrical Ceramic Fingers
32
Some codes cover...
stress relieving
33
Stress relieving codes specify the 3 things
Heating rate Holding Time Cooling Rate