Question 1

Pure aluminum melts at ____ Fahrenheit.

Accepted Answer

A)  1200° 
B)  1500° 
C)  1800° 
D)  2200° 
A)  1200° 
B)  1500° 
C)  1800° 
D)  2200° A

Question 2

Which of the following is a stainless steel alloy group?

Accepted Answer

A)  Chromium alloy 
B)  Nickel chromium 
C)  Manganese alloy 
D)  Ferritic 
A)  Chromium alloy 
B)  Nickel chromium 
C)  Manganese alloy 
D)  Ferritic D

Question 3

Low carbon steel has a carbon content of less than ____ %.

Accepted Answer

A)  0.15 
B)  0.30 
C)  0.50 
D)  30 
A)  0.15 
B)  0.30 
C)  0.50 
D)  30 B

Question 4

​Why must metal that is below 70°F (20°C) be preheated before welding?

Accepted Answer

A)  ​If the metal is too cold, you cannot get a weld pool established. 
B)  ​Because the cold metal quenches the weld. 
C)  ​The arc on cold metal is not stable, and it will wander around the surface making it hard to keep the weld going along the joint. 
D)  ​The hot metal on the cold plate will not stick, it just bounces off. 
A)  ​If the metal is too cold, you cannot get a weld pool established. 
B)  ​Because the cold metal quenches the weld. 
C)  ​The arc on cold metal is not stable, and it will wander around the surface making it hard to keep the weld going along the joint. 
D)  ​The hot metal on the cold plate will not stick, it just bounces off.

Question 5

Chromium carbides form when the metal is between ____ Fahrenheit.

Accepted Answer

A)  200° and 500º 
B)  500° and 800º 
C)  800° and 1500° 
D)  1500° and 2000° 
A)  200° and 500º 
B)  500° and 800º 
C)  800° and 1500° 
D)  1500° and 2000°

Question 6

Two of the most important properties of the nonferrous metal ____________________ are its extremely high strength-to-weight ratio (in alloy form) and its generally excellent corrosion resistance.

Accepted Answer

The answer of Two of the most important properties of...

Question 7

​Why are fluxing materials used for welding?

Accepted Answer

A)  ​To produce a shinier surface on the weld. 
B)  ​Because some metals are reactive to the atmosphere when heated. 
C)  ​It is a way to help control the heat input to the base plate. 
D)  ​To insure 100% joint penetration on V-grooved joints. 
A)  ​To produce a shinier surface on the weld. 
B)  ​Because some metals are reactive to the atmosphere when heated. 
C)  ​It is a way to help control the heat input to the base plate. 
D)  ​To insure 100% joint penetration on V-grooved joints.

Question 8

Medium carbon steel has ____ % carbon content.

Accepted Answer

A)  0.30 
B)  0.30 to 0.50 
C)  30 
D)  30 to 50 
A)  0.30 
B)  0.30 to 0.50 
C)  30 
D)  30 to 50

Question 9

____________________ steel is used for wear resistance in applications involving impact, such as power shovels, rock crushers, mine equipment, and augers.

Accepted Answer

The answer of ____________________ steel is used for wear resistance...

Question 10

When welding tool steel using the gas welding method, the rods selected for welding repairs should have ____.

Accepted Answer

A)  a carbon content matching the base metal 
B)  a much higher carbon content than the base metal 
C)  a slightly higher carbon content than the base metal 
D)  a much lower carbon content than the base metal 
A)  a carbon content matching the base metal 
B)  a much higher carbon content than the base metal 
C)  a slightly higher carbon content than the base metal 
D)  a much lower carbon content than the base metal

Question 11

In the AISI system, the letter ____ indicates basic open-hearth or electric furnace steel and basic oxygen furnace steel.

Accepted Answer

A)  C 
B)  E 
C)  F 
D)  O 
A)  C 
B)  E 
C)  F 
D)  O

Question 12

How can cracks in martensite be prevented?

Accepted Answer

Martensite is very hard and brittle and

Question 13

In both steel classification systems, the first number often, but not always, refers to ____.

Accepted Answer

A)  the most appropriate type of welding 
B)  the basic type of steel 
C)  the melting point 
D)  the carbon content 
A)  the most appropriate type of welding 
B)  the basic type of steel 
C)  the melting point 
D)  the carbon content

Question 14

For steels containing more than ____ % carbon, preheating and subsequent heat treatment generally are required.

Accepted Answer

A)  0.30 
B)  0.40 
C)  30 
D)  40 
A)  0.30 
B)  0.40 
C)  30 
D)  40

Question 15

Explain why a part must be cleaned before repair or maintenance welding can be performed.

Accepted Answer

It is never safe to weld on any part tha

Question 16

Chromium and carbon combine to form ____________________.

Accepted Answer

The answer of Chromium and carbon combine to form ____________________....

Question 17

To improve weldability in stainless steel, the carbon content should not be more than ____ %.

Accepted Answer

A)  0.03 
B)  0.30 
C)  3.0 
D)  30.0 
A)  0.03 
B)  0.30 
C)  3.0 
D)  30.0

Question 18

​What is the major purpose of pre- and post-heating cast iron for welding?

Accepted Answer

A)  ​To allow the weld to fuse deeper into the joint. 
B)  ​To control the rate of temperature change. 
C)  ​To reduce the carbon content in the casting around the weld which makes it less brittle. 
D)  ​It helps the weld metal flow more evenly into the crack. 
A)  ​To allow the weld to fuse deeper into the joint. 
B)  ​To control the rate of temperature change. 
C)  ​To reduce the carbon content in the casting around the weld which makes it less brittle. 
D)  ​It helps the weld metal flow more evenly into the crack.

Question 19

​Which of the following is not a common defect if the wrong filler metal is selected for a weld?

Accepted Answer

A)  ​porosity 
B)  ​cracks 
C)  ​underfill 
D)  ​Filler metal just will not stick. 
A)  ​porosity 
B)  ​cracks 
C)  ​underfill 
D)  ​Filler metal just will not stick.

Question 20

​Why must all surface contamination be removed before making a repair weld?

Accepted Answer

A)  ​To prevent injuring your health from exposure to materials released during welding. 
B)  ​Some chemicals contaminations can be completely safe until they are exposed to the welding. 
C)  ​The smoke or fumes contamination produce can be an irritant to the skin or eyes. 
D)  ​All of the above 
A)  ​To prevent injuring your health from exposure to materials released during welding. 
B)  ​Some chemicals contaminations can be completely safe until they are exposed to the welding. 
C)  ​The smoke or fumes contamination produce can be an irritant to the skin or eyes. 
D)  ​All of the above

Exam 27: Weldability of Metals

Pure aluminum melts at ____ Fahrenheit.

Which of the following is a stainless steel alloy group?

Low carbon steel has a carbon content of less than ____ %.

​Why must metal that is below 70°F (20°C) be preheated before welding?

Chromium carbides form when the metal is between ____ Fahrenheit.

Two of the most important properties of the nonferrous metal ____________________ are its extremely high strength-to-weight ratio (in alloy form) and its generally excellent corrosion resistance.

​Why are fluxing materials used for welding?

Medium carbon steel has ____ % carbon content.

____________________ steel is used for wear resistance in applications involving impact, such as power shovels, rock crushers, mine equipment, and augers.

When welding tool steel using the gas welding method, the rods selected for welding repairs should have ____.

In the AISI system, the letter ____ indicates basic open-hearth or electric furnace steel and basic oxygen furnace steel.

How can cracks in martensite be prevented?

In both steel classification systems, the first number often, but not always, refers to ____.

For steels containing more than ____ % carbon, preheating and subsequent heat treatment generally are required.

Explain why a part must be cleaned before repair or maintenance welding can be performed.

Chromium and carbon combine to form ____________________.

To improve weldability in stainless steel, the carbon content should not be more than ____ %.

​What is the major purpose of pre- and post-heating cast iron for welding?

​Which of the following is not a common defect if the wrong filler metal is selected for a weld?

​Why must all surface contamination be removed before making a repair weld?

Introduction to Welding

Safety in Welding

Shielded Metal Arc Equipment, Setup, and Operation

Shielded Metal Arc Welding of Plate

Shielded Metal Arc Welding of Pipe

Shielded Metal Arc Welding Aws Sense Certification

Flame Cutting

Plasma Arc Cutting

Related Cutting Processes

Gas Metal Arc Welding Equipment, Setup, and Operation

Gas Metal Arc Welding

Flux Cored Arc Welding Equipment, Setup, and Operation

Flux Cored Arc Welding

Gas Metal Arc and Flux Cored Arc Welding of Pipe

Gas Metal Arc and Flux Cored Arc Welding Aws Sense Certification

Gas Tungsten Arc Welding Equipment, Setup, Operation, and Filler Metals

Gas Tungsten Arc Welding of Plate

Gas Tungsten Arc Welding of Pipe

Gas Tungsten Arc Welding Plate and Pipe Aws Sense Certification

Shop Math and Weld Cost

Reading Technical Drawings

Welding Joint Design and Welding Symbols

Fabricating Techniques and Practices

Welding Codes and Standards

Testing and Inspection of Welds

Welding Metallurgy

Filler Metal Selection

Welding Automation and Robotics

Other Welding Processes

Oxyfuel Welding and Cutting Equipment, Setup, and Operation

Oxyacetylene Welding

Brazing, Braze Welding, and Soldering

Filters

Why must metal that is below 70°F (20°C) be preheated before welding?

Why are fluxing materials used for welding?

What is the major purpose of pre- and post-heating cast iron for welding?

Which of the following is not a common defect if the wrong filler metal is selected for a weld?

Why must all surface contamination be removed before making a repair weld?