Most of the hazards of manual welding are welder's pneumoconiosis, and the carbon dioxide burned by secondary welding will form ozone, which has a great influence on the lungs. Argon arc welding is the most harmful. Long-term work can lead to infertility of male welders or fetal malformation. Female welders can cause various gynecological diseases, and in severe cases, they will have habitual abortion. Or fetal malformation without fetal heart.
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The composition of welding fume changes with the use of covered electrode. Covered electrode consists of welding core and coating. The core contains a lot of iron, carbon, manganese, silicon, chromium, nickel, sulfur and phosphorus. The materials in the coating are mainly composed of marble, fluorite, rutile, pure salt, water glass, ferromanganese and so on.
During welding, the high temperature of 4000℃-6000℃ is generated by arc discharge. When covered electrode and weldments are melted, a lot of smoke and dust will be produced, which is mainly composed of iron oxide, manganese oxide, silicon dioxide, silicate and so on. Smoke particles diffuse in the working environment and are easily inhaled into the lungs. Long-term inhalation can cause pulmonary fibrosis, which is called welder's pneumoconiosis, often accompanied by manganese poisoning, fluorosis and metal smog fever. The main manifestations of patients are chest tightness, chest pain, shortness of breath, cough and other respiratory symptoms, accompanied by headaches, general weakness and other diseases, and lung function is also damaged to some extent.