Stainless steel pipe welded is produced by rolling a stainless steel plate and welding the seam together. [1] A scarfing blade is then used to remove the weld flash from both the inner and outer surfaces of the pipe. To enhance the appearance and integrity of the weld, the pipe undergoes heat treatment, which minimizes the visibility of the seam and provides a smoother finish. With advancements in stainless steel pipe manufacturing technology, welded pipes now typically offer tighter dimensional tolerances compared to seamless pipes. [2]

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Source:
[1] https://www.escpile.com/single-post/steel-pipes-choosing-between-seamless-and-welded/
[2] https://stainlessandalloy.com/stainless-steel-welded-pipe/