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Welding of shackles - DEV imca
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Welding of shackles

A member has reported that in spite of clear work instructions and procedures to the contrary, shackles and hooks at the worksite were being regularly modified by welding. Rigging suppliers or individual worksites were carrying out welding modifications (mainly to shackles) after delivery from the manufacturer. This practice invalidates the manufacturer’s certificate and is potentially hazardous.

The welding of shackles (after delivery from manufacturer) has the effect of adversely altering the material properties and increases the risk of failure by various brittle modes. In addition to this increased risk, the nature of the failure is unpredictable, is not time dependant and cannot be prevented by inspection.

Our member recommends that all shackles and hooks that have been modified by welding should be removed from service. Equipment suppliers should be instructed not to modify or issue modified shackles or hooks for use on any worksite.

Example of shackle with welded modification performed by supplier
Example of shackle with welded modification performed by supplier
Example of shackle with welded modification performed at worksite
Example of shackle with welded modification performed at worksite

Safety Event

Published: 15 December 2010
Download: IMCA SF 08/10

IMCA Safety Flashes
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IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of all. The effectiveness of the IMCA Safety Flash system depends on Members sharing information and so avoiding repeat incidents. Please consider adding safetyreports@imca-int.com to your internal distribution list for safety alerts or manually submitting information on incidents you consider may be relevant. All information is anonymised or sanitised, as appropriate.

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