Frank Armao, group leader nonferrous applications at The Lincoln Electric Company, wrote this Guide. Armao drew rave reviews when he invited members of the AWS D1G Subcommittee on Aluminum Structures, on which he serves, to review the text. With an emphasis on common, effective practices in highvolume situations, it covers mechanical properties of aluminum affected by welding alloy and temper designations filler metal selection prewelding preparation GTAW, GMAW, and SMAW defects and discontinuities and problems in qualifying welding procedures.