Powerline tower arm failure analysis
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Arms bolted to powerline towers were falling off two weeks after installation. Metallurgical and chemical analysis performed on the base metal, weld zone, and heat-affected zone (HAZ) showed acceptable-quality material. Residual stress appeared to be responsible for the high failure rate. The sources of residual stress included welding, environment, and assembly operation.
KeywordsASTM A588 chemistry dimensional tolerance embrittlement fatigue heat-affected zone residual stress tensile strength weld
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