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Friday, June 6, 2014

【Mechanical Test】



Flattening Test
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.
Flaring Test
The minimum expansion of the outside diameter should be 20%with no cracking.
Reverse Flattening Test
As shown in the figure, the pipe is unfolded into a plate and no evidence of cracking should be found.
Flange Test
As shown in the figure.when the pipe end is pressed to form an edge, the welded portion should not show any cracking.
Reverse-Bend Test
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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