Metallurgical failure analysis was requested after a custom, hand fabricated dumpster gate hinge mechanism failed and fell on and injured a workman. The subject gate and hinge was fabricated by a small welding shop. The gate is shown in Photograph A. One of the failed gate hinge poles is shown in Photograph B.
Photograph A Subject gate hinge pin welded to gate frame.
Photograph B Gate hinge mounting pole in trash dumpster bay.
A close-up view of a typical un-welded hinge pin is shown in Photograph C. Two of the failed hinges are shown in Photograph D and E.
Photograph C The hinge pin is deformed but no weld failure occurred.
Photograph D Failed and wallowed out female hinge pin receiver.
Photograph E Failed fence pin receiver. Note that no weld failure occurred.
No metallurgical testing was conducted. Visual examination confirmed that the subject trash dumpster gate hinges were not defectively welded. It is clearly evident that the welds did not fail and that failure and dropping of the gate was the result of overloading the gate hinges. Failure of the subject hinge pins were the result of defective design by the architectural design group and project structural engineer.