Cutting Chapter 9

Question 1

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

Answer 1

Interpass Temperature Control

Question 2

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

Answer 2

They dont contain much carbon

Question 3

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

It also reduces the metal’s toughness

Answer 3

Medium
High

T

Question 4

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

Answer 4

High Heat Absorbtion Capacity

Question 5

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

Answer 5

Welding Arc

Question 6

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

Answer 6

Hydrogen
Oxygen
Slag

Question 7

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

Answer 7

As the metal begins to cool.

Question 8

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

Answer 8

Mild Carbon Steels

Question 9

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

Answer 9

Freezing Temperatures

Question 10

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

Answer 10

Above 70’ F

Question 11

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

Answer 11

Induction Heating

Question 12

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

Answer 12

Magnetic Coil

Question 13

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

Answer 13

Pyrometer

Question 14

Noncontact instruments commonly used to measure temperature.

Answer 14

Optical Pyrometers

Question 15

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

Answer 15

Temperature-sensitive indicators

Question 16

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

Answer 16

Crayon Sticks
Liquids
Chalks
Powders
Pellets
Labels

Question 17

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

Answer 17

T

Question 18

Often simply a continuation of preheating.

Heating equipment and techniques arent the same

Answer 18

Interpass Temperature

F

Question 19

The most commonly used postheat treatment.

Answer 19

Stress Relieving

Question 20

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

Answer 20

1,050 F to 1200 F

Question 21

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

Answer 21

Normalizing

Question 22

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

Answer 22

Annealing

Question 23

Tempering is aka

Answer 23

Drawing

Question 24

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

Answer 24

Tempering

Question 25

Tempering is done at temperatures above the critical temperature.

Answer 25

F

Question 26

Tempering is much lower than those used for ..3 things

Answer 26

Annealing
Normalizing
Stress Relieving

Question 27

Tempering is commonly done to

Answer 27

tool steel

Question 28

Parts that have been hardened using the cold forming process may look….

Answer 28

brighter in appearance

Question 29

Electrical devices that often used to heat and relieve stress in metals

Answer 29

Ceramic Heating Elements

Question 30

The individual ceramic components, or fingers, are threaded together as needed to cover the metal being heated.

Answer 30

The Heating Elements

Question 31

Threaded through the individual ceramic fingers, and they heat the fingers when the power is applied.

Answer 31

Electrical Ceramic Fingers

Question 32

Some codes cover…

Answer 32

stress relieving

Question 33

Stress relieving codes specify the 3 things

Answer 33

Heating rate
Holding Time
Cooling Rate