Chapter 21 Knowledge Check

Chapter 21

Quiz yourself using the following chapter review questions to check how well you can recall the material.

Review Questions

1. A common non-ferrous metal that most welding programs offer is                          welding.
2. True or False: Welding non-ferrous metals is easier than welding low carbon steel.
3. For aerospace and space exploration which property is NOT sought after?
   1. High strength to weight ratio.
   2. Low strength to weight ratio.
   3. Large temperature swing capabilities.
   4. Extreme in-service conditions.
4. Aluminum does not give off                    when heated like ferrous metals.
5. True or False: The oxide layer forms slowly on aluminum.
6. Which type of brushes are used to clean aluminum?
   1. Aluminum
   2. Steel
   3. Stainless steel
   4. Copper
7. Which Aluminum Alloy series is not easily weldable?
   1. 1000
   2. 2000
   3. 3000
   4. 5000
8. Which Aluminum Alloy series is used for Electrical?
   1. 1000
   2. 2000
   3. 3000
   4. 5000
9. When welding cast aluminum, what is one thing you may not be able to remove all of?
   1. Paint
   2. Impurities
   3. Aluminum
   4. Filler metal
10. Which reactive metal can cause severe damage to your health?
    1. Beryllium
    2. Titanium
    3. Zirconium
    4. Unobtanium

Answer Key

1. Aluminum. Aluminum welding is the most common non-ferrous metal that is offered in welding programs due to its popularity in industry.
2. False. Welding low carbon steels is easier. Welding schools start welders on low carbon steel because it is the easiest to weld. Once techniques are developed by students, it is easier to move onto more difficult metals.
3. Low strength to weight ratio. The opposite is desired. Launching the lightest possible craft with the required strength is desired. This answer is the opposite.
4. Red light. Aluminum is more difficult to weld for a number of reasons, one of them being that you cannot tell by looking at aluminum that it is getting hot.
5. False. The oxide layer starts to form immediately on freshly cleaned aluminum. If you clean the oxide layer off and then take a break, you will need to clean your aluminum base metal again before welding.
6. Stainless steel.  Stainless steel brushes are used to clean aluminum. It is important to start with a new stainless steel brush and only use it for aluminum. Write Aluminum Only on the handle so you only use it for aluminum.
7. 2000. The 2000 series is generally weldable but it typically needs a higher heat input and speed.
8. 1000. The 1000 series of aluminum alloys is commonly used for electrical applications.
9. Impurities. Impurities such as oil, grease, lubricants, etc. will seep into cast aluminum while in-service. Because cast aluminum is porous, you may not be able to remove all of the impurities.
10. Beryllium. Beryllium is used in many industries but it is very hazardous to your health when fine particles are breathed in.