This guide provides information on welding processes and procedures that are recommended for use in titanium fabrication. The document presents detailed and up-todate technical information on the best practices to allow first-time users of titanium as well as established fabricators to join titanium parts into high quality components. This standard makes use of both the U.S. Customary Units and the International System of Units (SI). The latter are shown within brackets [ ] or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore@ each system must be used independently of the other without combining in any way. The standard with the designation G2.4:2007 uses U.S. Customary Units. The standard with the designation G2.4M:2007 uses SI Units. Safety and health issues and concerns are beyond the scope of this standard and therefore are not fully addressed herein. Safety and health information is available from other sources@ including@ but not limited to@ ANSI Z49.1@ Safety in Welding@ Cutting@ and Allied Processes@ and applicable federal and state regulations.