Abstract
Tribology is the science of friction that tries to answer the most basic questions on the methods of friction stir welding (FSW) and friction stir processing (FSP) technology. This chapter attempts to examine the main aspects related to friction, tool wear, friction coeffi cient, wear mechanisms and other issues in FSW and FSP, of various materials such as aluminum alloys, magnesium alloys, titanium alloys, copper alloys, and various structural steels. The tribological characteristics and behavior of materials under various loads typical of FSW are considered. One advantage of the method is the possibility of FSW to weld various dissimilar materials such as steel- aluminum, titanium- copper, etc. The questions of friction of such materials are also discussed. The FSP method is now becoming an effective method of strengthening of work surfaces by the addition of various reinforcing particles, such as Al2O3 , ZrB2 , SiC, etc. The tribological characteristics of similar processes are carefully examined. Of course, a lot of attention is paid to the issues of tool wear in FSW and FSP.
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