Cracking of Upper Pipe of Hydraulic Prop Made of 32HA Steel: Case Study
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 2
Abstract
This article describes the cracking of a hydraulic cylinder pipe made of 32HA steel with an Ar-shielded gas tungsten arc–welded (GTAW) protective housing. Grade 32HA is a Polish grade of steel that contains approximately 0.32% carbon and is designed for use on pipes and tubes for hydraulic cylinders. A fragment of the cylinder pipe and a welded joint of the protective housing were subjected to light microscopy (LM)-based macro- and microscopic metallographic examination. Tests of mechanical properties and impact energy, measurements of hardness, and analyses of chemical composition were also carried out. It was determined that the primary reason for cracking was the overloading of the pipe with the pressure of the working liquid inside the cylinder during operation. It was also ascertained that the welding of the protective housing created a heat-affected zone in the steel; this HAZ was of a very hard and brittle martensitic structure consisting of a structural notch that increased the steel’s susceptibility to cracking in this area.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This work was supported by the Institute of Welding Research Project No. Ic-33, 2008.
References
Gawliński, M., and Sysak, Z. (2006). “Security of hydraulic mining housing against dynamic overload.” Mining Machinery, 3, 13–16.
Nahorniak, E., and Profaska, M. (1998). “Trends in improving the reliability of the identification of hydraulic cylinders for mechanized mining supports.” Mining Machinery, 76, 104–110.
Information & Authors
Information
Published In
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 2, 2014
Accepted: Dec 26, 2014
Published online: Feb 24, 2015
Discussion open until: Jul 24, 2015
Published in print: Apr 1, 2016
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.