Common EWP Structural Failures and How They Start
Most EWP structural failures follow predictable patterns. Knowing where and how they start helps owners target inspection and maintenance effectively.
Structural failures in elevated work platforms are frightening because they put people at height, but they are rarely random. The great majority follow well-understood patterns, initiating at predictable locations and progressing in predictable ways. Understanding these failure modes helps owners see why inspection focuses where it does and why early detection is so valuable.
Boom weld fatigue cracking
The most common serious defect is fatigue cracking at boom welds, particularly at the toes of welds where boom sections join and at cylinder mounting lugs. Every lift cycles the boom through stress, and over tens of thousands of cycles a microscopic flaw at a weld can initiate a crack that grows a little with each use.
These cracks are usually invisible until well advanced, which is why magnetic particle inspection of boom welds is central to major inspections. Caught early, a crack can often be repaired to a proper procedure; missed, it can propagate to sudden failure of a load-bearing member.
Pin, bore and bush wear
Every pivot on an EWP carries load through pins running in bores and bushes. Over time these wear, developing play that concentrates stress, accelerates further wear and can lead to bore elongation or cracking around the bore. Excessive play also changes how load is transferred, loading components in ways the designer did not intend.
Inspectors measure pin and bore wear against manufacturer tolerances and look for cracking around highly loaded bores. Worn pins and bushes are relatively cheap to replace if caught during routine inspection, but neglected they can lead to structural damage that is far more expensive to remedy.
- Boom pivot pins and bores
- Cylinder mounting eyes and lugs
- Platform attachment pivots
Corrosion and section loss
Corrosion is the slow structural failure. It is especially insidious inside box-section booms and chassis members, where it attacks from the inside and is invisible externally until significant section has been lost. Coastal, marine and some industrial environments accelerate it dramatically, and water trapped inside sections is a common culprit.
Because corrosion reduces the load-bearing cross-section, it erodes the safety margin the machine was designed with. Ultrasonic thickness testing is the tool that reveals internal section loss, and it is why machines in aggressive environments warrant more frequent and more thorough inspection than their age alone would suggest.
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