This document represents a continuation of the work conducted in the period November 1961 to November 1962, previously entitled "Determination of Causes of Cracking in Welding Age Hardenable High Temperature Alloys" by B. S. Blum.nIn this year's work, low melting filler wires, variations in base metal composition, and effects of prior material history were examined with respect to underbead cracking in A-286, with the latter being shown to be the controlling factor in cracking.nStresses up to 28, 350 psi were shown to be generated in Rene' 41 aged under restraint. The effects of prior heat treatment and cold working on micro structural changes and rates during Rene 41 aging are examined. Specimens were developed for evaluating strain age cracking propensity of different heats or different process treatments for sheet, bar, and plate material. Effects of long time-low temperature aging, preheating, welding technique, penning, localized aging, and rate of heating on strain age cracking propensity were determined.nThis technical documentary report has been reviewed and is approved.
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