The common hazards of welding are as follows: 1. Toxic gases are easily produced when welding, and a lot of nitrogen oxide, carbon dioxide and ozone are produced, which have a great impact on human health and can stimulate the respiratory tract and cause bronchitis over time. 2. Suspended microscopic particles are also produced during the welding process, which can cause pneumoconiosis. 3. It is easy to stimulate the conjunctiva to appear conjunctivitis, there will be damage to the cornea, causing vision loss 4, the skin on the face will also have a lot of damage, prone to repeated peeling, serious will cause other skin diseases, and even local tumors. Generally need to pay attention to protection, need to reduce the risk to a minimum level.