When are the thin-walled tubes of the noncircular cross-section often used to construct?

Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Larry Jeffus
Chapter11: Gas Metal Arc Welding
Section: Chapter Questions
Problem 20R: What type of porosity is most often caused by mill scale?
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When are the thin-walled tubes of the noncircular cross-section often used to construct?

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