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Welding is an essential trade across the UK, supporting many industries from construction to manufacturing, but alongside its importance comes a set of well-documented health risks.
Fumes created by the process are a complex mixture of metallic oxides, silicates and gases produced when metals are heated above their boiling point and condense into fine airborne particles. When inhaled, they can penetrate deep into the lungs, potentially causing both short-term irritation and long-term disease.
The impact depends on several factors including the duration of exposure, the type of materials being welded and the level of ventilation in the working environment. Acute exposure refers to short-term contact with high concentrations of fumes, often leading to immediate but reversible symptoms. Chronic exposure, by contrast, occurs over extended periods and is associated with more serious, often irreversible damage.
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Metal fume fever is a condition frequently experienced by those working with galvanised steel or other metals containing zinc. Symptoms resemble those of flu and include fever, chills, fatigue and muscle aches. While unpleasant, these symptoms typically resolve within 24 to 48 hours once exposure stops.
Other acute effects include irritation of the throat and upper airways, which can make breathing uncomfortable and trigger coughing. In some cases, individuals may develop acute irritant-induced asthma, even if they have no prior history of respiratory conditions. This can lead to wheezing, shortness of breath and chest tightness shortly after exposure.
More severe outcomes are also possible. Acute pneumonia can develop following exposure to high concentrations of fumes, particularly in poorly ventilated environments. According to the UK Health and Safety Executive, an estimated 40 to 50 welders are hospitalised each year due to acute symptoms linked to welding fume exposure. This highlights that even short-term contact shouldn’t be underestimated.
The long-term effects of welding fumes present the greatest risks to health, potentially leading to progressive and often irreversible lung diseases. Conditions such as chronic bronchitis and occupational asthma may develop gradually, with symptoms worsening over time. Chronic obstructive pulmonary disease, commonly known as COPD, is another significant risk, restricting airflow and making breathing increasingly difficult.
Fibrosis, or scarring of lung tissue, is a particularly serious outcome. As scar tissue builds up, the lungs lose their ability to expand and contract effectively, leading to permanent reductions in function. In more severe cases, prolonged exposure to hazardous substances such as hexavalent chromium can increase the risks of lung cancer.
The term “welder’s lung” is often used to describe a range of lung conditions caused by long-term inhalation of fumes. It reflects the cumulative damage that can occur over several years, particularly when protective measures are insufficient.
Research into exposure levels supports concerns. Studies have shown short-term moderate exposure may result in inflammation that can subside once the contact ceases. However, higher doses and longer durations are linked to progressive fibrosis that may never fully reverse. People exposed to high concentrations over extended periods showed persistent lung damage even after welding stopped.
Gases such as argon, carbon dioxide, or nitrogen can displace oxygen, creating a dangerous atmosphere without obvious warning signs.
As oxygen levels drop, workers may experience dizziness, confusion and eventually loss of consciousness. Without prompt intervention, this can be fatal. The risk is particularly high in tanks, enclosed structures, or underground spaces where airflow is limited.
Preventative measures are essential. Proper ventilation, atmospheric monitoring and adherence to confined space safety procedures can significantly reduce the risk. Ensuring employees are trained to recognise the warning signs is equally important.
While respiratory issues are the most widely discussed, welding also presents several other health threats that should not be overlooked. Skin exposure to intense ultraviolet radiation from the welding arc can result in burns similar to severe sunburn. Repeated exposure may also cause longer-term skin irritation or damage.
Neurological effects are another concern, particularly with exposure to metals such as manganese. Over time, this can affect the nervous system, potentially leading to symptoms resembling Parkinson’s disease, including tremors and difficulty with movement.
Eye health is also at risk. Arc-eye, a painful condition caused by intense ultraviolet light, can occur if appropriate protection is not used. Symptoms include redness, tearing and a sensation of grit in the eyes. In addition, the noise and vibration can contribute to hearing loss and musculoskeletal issues over time.
Technology is designed to capture harmful particles at source, preventing them from entering the breathing zone. Widely regarded as one of the most effective ways to reduce exposure in both small workshops and large industrial settings, it can take various forms including local exhaust ventilation units, portable extractors and integrated systems built into workstations.
In the UK, workplace exposure limits are regulated to protect employee health. The Health and Safety Executive has established guidelines requiring employers to implement suitable control measures, including extraction systems, to minimise exposure. Since 2019, updated guidance has made it clear that all welding fumes, including from mild steel, should be adequately controlled.
By investing in appropriate solutions and maintaining them properly, workplaces can significantly reduce the risks, protecting health and ensuring compliance with legal requirements.
In many cases, the lungs can recover from short-term or moderate exposure, particularly if it has been reduced or eliminated quickly. Conditions such as metal fume fever typically resolve quickly, while mild inflammation in the lungs can subside over time.
There is also evidence that some changes visible on medical imaging, such as early signs of pneumoconiosis, may improve later. This suggests the body has a degree of resilience, particularly when damage is limited and intervention occurs early.
However, recovery has its limits. Long-term or high-level welding exposure can lead to permanent damage including fibrosis, COPD and cancer. These conditions are generally not reversible and may continue to progress even after retirement. Key factors influencing recovery include the intensity and duration of exposure, the specific substances involved and the individual’s overall health.
The positive news is that many of the risks can be managed through proper precautions such as welding fume extraction systems, safe working practices and greater awareness of workplace hazards. Ultimately, while the lungs can recover from limited exposure, prevention remains the most effective strategy against future ill health.
AirBench Ltd are the UK’s leading manufacturer of downdraught benches and cross draught extraction systems. We have more than 10,000 extraction systems in service in the UK and overseas. Along with our range of coolant mist filters and air cleaning systems, we are actively helping businesses across many industries solve their workplace dust and fume issues.
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