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Credibility ,According to the manufacturing process of the seamless elbow, the outer side of the elbow is in tension stress state, and the wall thickness is easy to be thinned, the inner side is in the stress state, and the wall thickness is easy to be thickened or folded. For weld elbow, the weld seam is a complex part of stress distribution, which is easy to produce crack and weld defects.
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