Mechanical Failure of a Repair Welded Ferritic Malleable Cast Iron Spring Hanger
The right front spring hanger on a dual rear axle of the tractor of a tractor-trailer combination failed, causing the vehicle to roll-over. The hanger was made from malleable cast iron that had been heat treated to produce a decarburized surface layer and a pearlitic transition layer. It had been repair welded after breaking into two pieces longitudinally in a prior incident, using cast iron as weld metal. The repair weld bead on both surfaces missed the fracture over 15 to 20% of their lengths. The incomplete repair weld and brittleness of the weld metal and heat-affected zones led to the failure.
Alan A. Johnson, Joseph A. von Fraunhofer, Mechanical Failure of a Repair Welded Ferritic Malleable Cast Iron Spring Hanger, Handbook of Case Histories in Failure Analysis, Vol 2, Edited By Khlefa A. Esaklul, ASM International, 1993, p 76–78, https://doi.org/10.31399/asm.fach.v02.c9001307
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