Weld Failure on Concrete Pumping Truck
failure analysis was requested on a failed piece
of construction equipment. A leveling
outrigger arm attached to a concrete pumping truck
cracked through a weld resulting in an accident.
Metallurgical testing of the weld and surrounding
metal was conducted. A design analysis was
also conducted on the stabilizing outrigger arm.
Metallurgical testing in addition to macro and
microscopic examination determined that the cause of
the cracking and failure of the outrigger was
fatigue. The properties of the weld and
surrounding metal were satisfactory. As a
result of Finite Element Analysis (FEA)
, it was determined that the cause of the accident was faulty
design and a lack of proper inspection and