Solder fumes are harmful to the human body, so people who do this work need to protect themselves so as not to harm the body’s respiratory, nervous and immune systems. If the injury is serious you need to go to the hospital in time for examination and treatment so as not to cause more harm. General solder, because of the low melting point, lead content of about 60%, tin content of about 40%, so the solder itself is toxic. When welding solder wire, the working temperature up to 250 ℃ high temperature, local oxides, can be decomposed into carbon dioxide, sulfur dioxide and other harmful gases. 1. Respiratory system: welding fume exposure in the absence of appropriate precautions, may lead to respiratory mucosal edema, pain, and then irritating cough, pus sputum, sore throat and other symptoms, and even increase the risk of respiratory diseases such as aspiration pneumonia, bronchitis. 2. Nervous system: welding fume also contains more lead substances, a large number of inhalation can be involved in the nervous system, leading to toxic reactions in the body, such as dizziness, fuzzy consciousness, vomiting, headache and so on. 3. Immune system: Some sensitive people may be allergic to the components in welding fume. If contacted or inhaled, it will cause shortness of breath, chest tightness, or skin redness, rash, eczema and other allergic reactions. Daily life contact to do a good job of prevention, to avoid excessive contact and inhalation, the emergence of physical abnormalities, to seek medical attention in a timely manner, so as not to aggravate the hazards of soldering fumes on the body.