Which workshop of all electronics factories in Changzhou has toxic gas?

The inspection, separation, printing, mounting, welding and maintenance of SMT production line in electronic factory are all toxic. SMT is a component surface assembly technology, which is the most common technology and process in electronic assembly industry at present. The composition of this technology is as follows: printing (red glue/solder paste), testing, mounting, testing, welding, testing and maintenance (using tools: welding table, hot air welding table, etc. ), and cut the cardboard (manually or with a divider). Among them, detection and separation are less toxic, while printing, mounting, welding and maintenance are more toxic. In these processes, the most exposed are some toxic and harmful substances, such as solder paste, rosin, glue, alcohol, washing water, natural water and so on. Most of these toxic solvents contain trichloroethylene, benzene and toluene. Long-term exposure will damage people's liver function, and severe benzene poisoning will also cause some fatal diseases such as leukemia. There is no doubt about the harm of spot welding on the production line of electronic factory. The smoke produced during welding of welding wire is due to the gasification of flux in welding wire when it meets high temperature electric soldering iron. The flux in welding wire contains rosin and chemical raw materials. When welding in welding wire, the working temperature reaches 250 degrees, and some oxides can be decomposed into harmful gases such as carbon dioxide, sulfur dioxide and tin dioxide. In the process of welding, a lot of smoke will be produced, 95% of which comes from particles produced by solder and 5% is harmful gas. Cleaning, spraying and other working environments will also produce a lot of harmful gases.