Literature Survey on Weld-Metal Cracking
BATTELLE MEMORIAL INST COLUMBUS OH
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As the initial part of an investigation for Wright Air Development Center on the causes of cracking in high-strength weld metal, a literature survey was made. Work on wrought and cast steel was included in this survey, since it is the most prolific source of information on this subject. Of the various phenomena which might be pertinent, hot tearing, hot shortness, blue brittleness, and hydrogen embrittlement appeared to be closely related to the causes of weld-metal cracking. Investigators agree that most weld-metal cracking initiates at high temperatures in the boundaries between grains for dendrites. This type of cracking is generally attributed to the presence on these boundaries of low-melting-point or brittle compounds - complex sulfides, for example. Most types of low-temperature cracks in weld metal appeared to be associated with rapid cooling rates and hydrogen. As a result of this survey, the experimental program on this investigation will involve weld-metal cracking tests, studies of grain-boundary constituents which might cause cracking, preparation of special weld-metal compositions, and tests to determine the temperature at which cracking occurs.
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