When metals are fused together through welding, high temperatures vaporize the metal, generating fumes that are often hazardous to human health. Common materials involved in welding, such as mild steel, stainless steel, and aluminum, release various toxic substances, including manganese, lead, and chromium. Prolonged exposure to these fumes can result in conditions such as “metal fume fever,” chronic bronchitis, reduced lung function, and even more severe illnesses like cancer.