Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Textbook Question
Chapter 32, Problem 11R
Why does the edge of the top plate on a lap joint tend to melt more easily?
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Welding is a process that is used to attach pieces of metal to one another. In a certain welding process, small pieces of Al (s) and CuO (s) are placed in a crucible and ignited, causing the following highly exothermic
reaction to occur.
2 Al+ 3 Cuo - 3 Cu + Al,O3
The copper and aluminum oxide melt. The molten aluminum oxide floats to the top of the crucible. When the steel disk below the crucible melts, the molten copper flows into the weld cavity and welds the pieces of metal
together as it cools and solidifies. The setup is represented in the following diagram.
Mixture of Al(s)
and CuO(s)
Crucible
Steel Disk
Weld Cavity
Pieces of
Metal to Be
Connected
Hard soldering of metals can be done in the
melting point temperature range of
O 183°C-212°C
650°C-700°C
O 1600°C-1700°C
O 6000°C-7000°C
What percentage of a change are we allowed in travel speed when welding flux core? (number only)
Chapter 32 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 32 - What protects the molten weld pool from oxidation...Ch. 32 - How does tip size affect a gas weld?Ch. 32 - How does torch angle affect a gas weld?Ch. 32 - How does welding rod size affect a gas weld?Ch. 32 - What is a good indication that the molten weld...Ch. 32 - Why should the end of the gas filler rod be bent?Ch. 32 - What is the purpose of a heat sink?Ch. 32 - Why should the end of the welding rod be kept...Ch. 32 - Does a weld have to have 100 penetration to be...Ch. 32 - What technique can be used to minimize weld...
Ch. 32 - Why does the edge of the top plate on a lap joint...Ch. 32 - What is meant by the term out-of-position?Ch. 32 - What holds the molten weld pool in place on a...Ch. 32 - What additional personal safety protection should...Ch. 32 - What force holds the molten weld pool in place on...Ch. 32 - What is the welding sequence for a 1G pipe weld?Ch. 32 - What is the proper method for stopping a weld pool...Ch. 32 - What welding positions are required when making a...Ch. 32 - What welding positions are required when making a...Ch. 32 - How can 100 penetration be ensured when making...
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