Prepared under the direction of AWS Technical Activities Committee. Jay Bland, technical director. prepared under the direction of the ASM handbook committee ; Taylor Lyman, editor. Prepared under the direction of the Technical Practice Committee. prepared by AWS Committee on Brazing and Soldering under direction of AWS Technical Activities Committee, Edward A. Fenton, technical secretary. prepared under the direction of the ASM International Handbook Committee ; Theodore J. Reinhart, technical chairman. prepared under the direction of the ASM Committee on Gas Carburizing. Prepared under the supervision of National Technical Publications Committee, Frank W. Wilson, editor-in-chief.