In the ultrasonic test of girth or longitudinal butt joints in boiler, pressure vessel and pipe, there are multiple defects perpendicular to the length of the weld in a straight line. It is inappropriate of considering only the two adjacent defects in a line in quality classification without considering the defects located in different depth while in same lateral position. Hereby, we make tensile strength test of the rectangle samples with different numbers of side drilled holes, then do collection and analysis about the test result, so that we can get the relationship between elongation and tensile strength of the specimen under external force.

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