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 1R
What protects the molten weld pool from oxidation during a gas weld?
Expert Solution & Answer
To determine
The protection mechanism of molten weld pool from oxidation during a gas weld.
Answer to Problem 1R
The carbon dioxide produced by the reaction of carbon mono-oxide and atmospheric air protects the molten weld pool.
Explanation of Solution
The gas welding process is defined as the welding process in which a mixture of fuel gas and oxygen is burned to produce the flame. This flame is used to provide the heating effect to melt the metal to be welded. The fuel gas used is generally acetylene.
In oxy-acetylene gas welding, a torch is used to prepare a proportionate mixture of oxygen and acetylene coming out of different cylinders. The torch prepares the mixture and burned so that a flame is produced.
The atmospheric air is the culprit which oxidizes the molten weld pool, the outer portion of the flame protects the molten weld pool from the atmospheric air. The carbon mono oxide (CO) present in the outer flame combines with the atmospheric air to produce the carbon dioxide which acts as the inert gas and creates an envelope to protect the molten weld pool.
This carbon dioxide also forces the surrounding atmospheric air away from the weld.
Conclusion:
Thus, carbon dioxide produced by the reaction of carbon mono-oxide and atmospheric air protects the molten weld pool.
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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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