Welding Monitoring Case Studies
Resources · Resources overview
Anonymised welding fume monitoring and engineering exposure case studies, written as worked examples to illustrate how a typical UK fabrication or engineering workplace might approach a welding fume assessment. These are illustrative summaries, not verified client projects — no named clients, locations or exact figures are presented. Each example is intended to show how the issue, the assessment approach and the improvement themes connect in practice.
How to read these examples
Each case summary follows a consistent shape: the underlying issue or trigger, the welding fume assessment approach taken, the kind of findings that typically emerge, and the improvement themes that usually follow. We have deliberately avoided exact concentrations, named consumables or location detail so the examples remain illustrative rather than implied benchmarks.
If you recognise your workplace in one of the patterns below, treat that as a prompt to scope a proper site-specific assessment rather than a conclusion about your exposure. Welding fume exposure is highly dependent on process, consumable, base material, capture and workflow — generic numbers from elsewhere rarely transfer cleanly.
Example: fabrication welding fume monitoring
A medium-sized fabrication workshop running mixed MIG and MMA on mild steel commissioned a baseline welding fume monitoring round following the HSE's enforcement expectation around mild steel welding fume. The trigger was an internal compliance review rather than a specific incident.
The assessment used personal breathing-zone sampling across a representative sample of welders over a working shift, with laboratory analysis for inhalable welding fume and the relevant metal fraction. Improvement themes typically include closer on-torch capture for higher-fume processes, refresher training on LEV positioning, and a tightened RPE programme for tasks where engineering control alone is unlikely to bring exposure down sufficiently.
Example: stainless steel fume and metal constituent review
A fabricator moving more work onto stainless steel asked for a review of the metal fume profile their welders were now exposed to. The concern was that the consumable change had not been reflected in either the COSHH assessment or the monitoring scope.
The assessment approach extended air sampling to include chromium and nickel speciation alongside total inhalable welding fume, focused on the processes most likely to generate hexavalent chromium. Improvement themes commonly include updating the COSHH assessment to reflect the new metal profile, reviewing extraction performance on stainless work in particular, and confirming RPE selection is appropriate for the carcinogenic fraction.
Example: welding LEV and extraction performance review
An engineering workshop with a mix of on-torch extraction, capture hoods and a central LEV system requested a performance review after a thorough examination flagged inconsistent capture across bays. The aim was to understand whether the system as installed was still doing what the original design assumed.
The review looked at face velocities and capture distances at representative work positions, alongside short-duration sampling to test whether residual breathing-zone exposure tracked the capture performance. Improvement themes often include repositioning capture arms closer to the arc, addressing duct losses, and tightening the link between LEV thorough examination findings and the day-to-day welding fume programme.
Example: engineering workshop oil mist and fume investigation
A machine shop with adjacent welding bays raised concerns about mixed aerosol exposure: welding fume from fabrication, oil mist from CNC machining and grinding aerosols all sharing the same general ventilation envelope. The trigger was worker feedback rather than monitoring data.
The investigation combined personal sampling for welding fume and metals on the welding side with oil mist sampling on the machining side, looking at how the two exposure pools interacted in the shared workshop air. Improvement themes typically include partitioning the workspace where practical, upgrading enclosure on the highest-mist machines, and treating the welding and machining COSHH assessments as a single connected programme rather than two separate files.
Frequently asked questions
Are these real client case studies?
No. They are anonymised, illustrative examples written to show how a welding fume assessment typically unfolds. No named clients, real companies, exact locations or fabricated results are presented.
Can you produce a case study for our site?
Any work we describe externally would only be published with the workplace's explicit agreement and with appropriate anonymisation. Get in touch via the contact page to discuss scope.
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