Solder wire is a material for soldering with an electric iron. Although its main component is tin, it also contains other metals. Mainly divided into lead and lead-free (ie, environmentally friendly). With the introduction of the EU ROHS standard, more and more PCB soldering factories have chosen lead-free environmentally friendly ones, and leaded solder wires are gradually being replaced, and those that are not environmentally friendly cannot be exported. Lead-free solder paste, lead-free solder wire, and lead-free solder bars are the main products on the market.
To put it simply: the commonly used solder has a low melting point and contains about 60% lead and 40% tin, so the solder itself is toxic. Most of the solders on the market are hollow and contain rosin, so the gas you mentioned is probably volatilized when the rosin in the solder melts during soldering. The volatilized gas of rosin is also slightly toxic, and this gas is quite unpleasant. The main hazard of solder during soldering is lead smoke, even if it is lead-free solder, it contains a certain amount of lead. The limit value of lead fume in GBZ2-2002 is very low, the toxicity is very high, and it needs to be protected. Due to the damage to the human body and the environment in the welding process, in Europe, the protection of welding workers and the protection of the environment have been enforced in the form of legislation, and welding without any protective measures is not allowed. In the ISO14000 standard, there are clear regulations on the treatment and protection of pollution generated in the production process.
Tin contains lead. In the past, there was lead in solder wire, which classified solder as an occupational hazard position (in the National Occupational Disease Catalogue). Now our general enterprises use lead-free solder wire. The main component is tin, which is measured by the Center for Disease Control and Prevention. is tin dioxide; not on the National Register of Occupational Diseases. Lead-free process (leadfree) generally speaking, lead fume will not exceed the standard, but there are other hazards in soldering, such as flux (rosin-like substances), which have certain hazards, depending on the specific situation. Employees can usually look at the identification of the distributed tin and what category it belongs to, so that they can have evidence to check and request the company to rectify (you can give opinions to the internal trade union of the factory). If the tin contains lead, it is definitely harmful to the body. Over time, they accumulate in the body and can cause great damage to the immune system of the nervous system.
Lead-free solder wire is environmentally friendly, but lead-free solder wire is also harmful to the human body. The low lead content of lead-free solder wire is not lead-free. Pollution is less than leaded ones. The gas generated during soldering is toxic, and gas vapors such as rosin oil and zinc chloride are generated.
