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Destructive test for welded steel pipe

With more than twenty-year experience manufacturing steel pipes, we are well on our way to a lasting improvement. Today, we will have a discussion for destructive test for welded tube like ERW steel pipe.

 

For destructive test, there are two types: flattening test and the expansion test.

As for flattening test, we should cut about 100mm welded pipe and place it under the hydraulic press. Thus, we will prepare our test here. The welding position is perpendicular to the direction of the hydraulic machine. Start the hydraulic pressure. Slowly press the weld pipe and press the diameter of 3/4 to see if the weld is cracked. If there is no crack, weld mesh; if there is a crack, adjust the welding parameters in time.

Meanwhile, for the expansion test, we will place approximately 100mm of the welded pipe on the conical top core, place the conical top core under the hydraulic press, start the hydraulic pressure and slow down the welded pipe. When the flaring reaches 8%, check whether the weld is cracked. If there is no crack, weld mesh; if there is a crack, adjust the welding parameters in time.