Throughout history and all cultures, Moss Agate has been known as the crystal of gardeners and agriculture. It was considered a miraculous healing stone for tribal priests of the past, giving them power to interact with our human organic system, and was used as a talisman to make warriors strong and victorious.
FSW has been used to weld many softer materials (aluminum, copper, magnesium, etc.) for over a decade, and has more recently shown promise for welding harder metal alloys (steels, titanium, and nickel). Shown in Figure 4 is a typical friction stir weld made on Â¾-in. (19-mm) thick high-strength steel. Research is currently underway to evaluate tool life and weld properties for FSW of steel. EWI has been working to advance the friction welding processes for nearly 25 years.
FRICTION STIR CHANNELING: AN INNOVATIVE TECHNIQUE FOR HEAT EXCHANGER MANUFACTURING by NAGARAJAN BALASUBRAMANIAN A DISSERTATION Presented to the Faculty of the Graduate School of the MISSOURI UNIVERSITY OF SCIENCE & TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in MECHANICAL ENGINEERING 2008 Approved by