https://www.belman.com/in/metallic-expansion-joints/
Metallic Expansion Joints and Bellows - Belman Flexibles India
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https://usbellows.com/resources/faqs/is-seamless-tube-available-instead-of-a-butt-welded-tube-for-metallic-expansion-joints/
Is seamless tube available instead of a butt welded tube for metallic expansion joints? | US Bellows
Nov 9, 2020 - It depends upon the diameter of the expansion joints. Generally for the smaller expansion joints, seamless is available.