June 2019

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Engineering Case Histories: Case 107: Weld failures in vibrating equipment

Vibrating equipment can be machines, such as vibrating screens, conveyor pans or a combination of both, that are designed to transport, sort or dry materials.

Sofronas, A., Consulting Engineer

Vibrating equipment can be machines, such as vibrating screens, conveyor pans or a combination of both, that are designed to transport, sort or dry materials. Various types are used in many processing industries. They typically vibrate at 500 cycles per minute (cpm) and accumulate vibratory cycles quickly. These conveyors contain many welds and, while welds may not be a concern with constantly applied stresses, they can be with cyclic stresses. These conveyors are excellent weld fatigue testing machines, even though they are not intended to be used as such. When a weld is not designed for fatigue, it will likely fail. Welds contain unavoidable defects and, with elevated cyclic stresses, cra

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