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Welding is the basic process of metal working and metal structural repair in mechanical engineering and other industrial settings. However, welding is considered to be potentially hazardous work. Welding can be a source of injury causing eye damage, body burns, mechanical injuries and poisoning. The present paper identified the possible causes of burns by the Causal tree method. The probability of initial events, leading to burn, was estimated by the expert evaluation method. The severity of the injury consequences for welder's health was assessed. The severity of the consequences was defined as the financial loss of a company depending on the damage to worker's health during the welding work performance. The risk of burn of various severities was estimated and measures for its reduction were offered. The estimation of efficiency for the offered safety measures was carried out based on the cost for their implementation.