Failure of a straddle carrier wheel

assigment1_straddle carrier wheel

The submitted wheel had a crack on the HAZ of the filled weld that connected the rim to the bolt circle of the wheel. Sixteen more wheels presented the same type of failure.

The examination identified the crack as a fatigue crack which was created in a stress concentration area i.e. in an existing geometric anomaly associated with the closing of the weld bead.Elimination of the anomaly by grinding it after the welding or by performing the welding with better parameters and engineering practice should be adequate for improving the wheel fatigue life to much higher level.

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