Practical Failure Analysis

, Volume 2, Issue 4, pp 61–64 | Cite as

Catastrophic failure of a fan in a diesel engine cooler

  • B. V. Krishna
  • R. K. Sidhu
Peer Reviewed Articles
  • 51 Downloads

Abstract

The fan used to cool a diesel engine fractured catastrophically after approximately 100 h of operation. The fan failed at a spider, which was resistance spot welded to a shim placed between two circular spiders of 3 mm thickness. The detailed analysis of the fracture indicated that the premature failure of the fan was due to inadequate bonding between the sheets at the weld nugget. The fracture was initiated from the nugget-plate interface. The inadequate penetration and lack of fusion between the steel sheets during resistance spot welding led to poor weld strength and the fracture during operation. The propensity to crack initiation and failure was accentuated by improper cleaning of the surfaces prior to welding and to inadequate nugget-to-sheet edge distance.

Keywords

failure analysis heat penetration nugget-to-edge distance resistance spot welding weld strength 

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Copyright information

© ASM International - The Materials Information Society 2002

Authors and Affiliations

  • B. V. Krishna
    • 1
  • R. K. Sidhu
    • 1
  1. 1.Materials Science & Technology Division, Thapar Centre for Industrial Research and DevelopmentThapar Technology CampusPatialaIndia

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