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dc.contributor.advisorChairperson, Graduate Committee: David A. Milleren
dc.contributor.authorAdams, Alex Jacksonen
dc.description.abstractRotational friction welding is a common joining process used to join cylindrical metal components. Typically, one piece is rotated and a secondary piece is held rigid. The two samples are then forced together in a controlled manner, and the resulting friction generates enough heat to weld the two pieces. This process was characterized and optimized for 304 Stainless Steel tubes with a .317 cm (.125 in) outer diameter and .14 cm (.055 in) inner diameter. The goal was to characterize and optimize parameters around a weld with no leak, strong ultimate tensile strength, and proper through-hole integrity. Also, solid bars were welded to some tubes to analyze a capped system. Key parameters to the process that were monitored and/or controlled include rotational speed, applied force, temperature, duration, and material upset. Often times the applied force is divided into two steps. A lower force is applied during heating (friction force), and a larger force is applied once rotation stops (forging force). The material upset, maximum temperature, and forging fore were the primary controlling variables in this study. Other parameters were held constant. A testing setup was built to analyze these factors. Modifications were made to a three axis mill to perform friction welding in a controlled environment. Then, tests were run to understand the effects each parameter had on weld quality. Welds with an upset greater than .1 cm held a pressure at a much higher success rate than welds with lower upsets. In general, the forging force was shown to have a large positive impact on ultimate tensile force. The integrity of the through-hole was compromised in many of the tube to tube tests. Several welds were post-drilled to recreate the through-hole. Tests with this done held a pressure 66.67% of the time. It was found that successful welding can be accomplished with this process, and different adjustments to testing procedures can maximize different qualities in the weld.en
dc.publisherMontana State University - Bozeman, College of Engineeringen
dc.subject.lcshFriction weldingen
dc.subject.lcshTubes, Steelen
dc.subject.lcshStainless steelen
dc.titleCharacterization and optimization of direct drive friction welding parameters in small stainless steel tube weldsen
dc.rights.holderCopyright 2013 by Alex Jackson Adamsen
thesis.catalog.ckey2503463en, Graduate Committee: Christopher H. M. Jenkins; Kevin Amendeen & Industrial Engineering.en

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