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Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695

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BuyFindarrow_forward

Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem
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What is the thin dark gray or black layer on new hot-rolled steel? How can it affect the weld?

To determine

To discuss:

A thin dark gray or black layer on new hot rolled steel.

Effect of thin dark gray or black layer on the weld.

Explanation

The thin gray and black layer on new hot-rolled steel is known as mill scale. It is small in size but it provides the source of oxygen as it contain the moisture. It generally occurs under the weld surface.

Effect of thin dark gray or black layer on the weld:

  1. Due to presence of oxygen, mill scale increases porosity in weld. It usually provides uniform scattered porosity which usually entrapped inside the weld surface and not visible...

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