Drift-Expanding Test to ISO 8493 & DIN 50135

Q: How is the drift-expanding test to ISO 8493 and DIN 50135 performed?

In the drift-expanding test, a conical mandrel is pressed into a tube specimen via materials testing machine according to the tube’s inner diameter and the tube is expanded. The test is ended when the value of the expansion defined in the specifications has been reached. The test is considered passed if no cracks are detected in the tube or at the welded seam after the test. The drift-expanding test is normally performed on tubes having an outside diameter of 150 mm and a wall thickness no greater than 10 mm. For tubes without a detectable welded seam, the drift-expanding test is used as a replacement for the tube-flattening test.

Compression test on metal tubes

In the drift-expanding test , the inner diameter of a tube is plastically expanded. The test is described in materials testing in the standards ISO 8493 and DIN 50135.

Testing of steel tubes such as the drift-expanding test is also described in Annex 2 of ASTM A370.

The following content explains the key aspects. For standard-compliant testing to ISO 8493 and DIN 50135, it is essential to purchase the complete standard.

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How is the drift-expanding test to ISO 8493 and DIN 50135 performed?

In the drift-expanding test, a conical mandrel is pressed into a tube specimen via materials testing machine according to the tube’s inner diameter and the tube is expanded. The test is ended when the value of the expansion defined in the specifications has been reached. The test is considered passed if no cracks are detected in the tube or at the welded seam after the test.

The drift-expanding test is normally performed on tubes having an outside diameter of 150 mm and a wall thickness no greater than 10 mm. For tubes without a detectable welded seam, the drift-expanding test is used as a replacement for the tube-flattening test.

Drift-expanding test to ISO 8493, DIN 50135, ASTM A370

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ABOUT THE AUTHOR:

Dr. Harald Schmid

Global Industry Manager for Metals – ZwickRoell GmbH & Co. KG

As Global Industry Manager, he is responsible for the industry strategy in the metals sector with a focus on market observation, further development of testing solutions and sales support in the international environment.

He has extensive experience in standardization work and is actively involved in various committees, including the international ISO committee “ISO/TC 164 Mechanical Testing of Metals” and national DIN working groups such as NA 062-01-42 AA Tensile and ductility testing for metals and NA 062-01-47 AA Impact test for metals and mechanical-technological testing of metallic pipes.

His academic career began with a degree in mechanical engineering (B.Sc. & M.Sc.) at the Karlsruhe Institute of Technology (KIT). After holding international positions in mechanical engineering, he worked as a research assistant at the Friedrich-Alexander-University Erlangen-Nuremberg with a focus on material characterization and sheet metal forming. He dedicated his doctorate to the topic of deep drawing processes with drawing beads.

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