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Flattening Test |
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In the flattening test, the steel pipe is compressed to a specified extent.The welded part of a qualified product should be without any cracking as shown in the figure. The steel pipe is tightly compressed and the welded portion is not broken. |
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Flaring Test |
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The minimum expansion of the outside diameter should be 20％with no cracking. |
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Reverse Flattening Test |
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As shown in the figure, the pipe is unfolded into a plate and no evidence of cracking should be found. |
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Flange Test |
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As shown in the figure.when the pipe end is pressed to form an edge, the welded portion should not show any cracking. |
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Reverse-Bend Test |
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The welded part is taken as a central line and the unfolded steel pipe is bent back and forth along it twice and there should not be any cracking. |
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