1. Why should lead-free soldering be introduced?

Lead is a toxic heavy metal. Excessive absorption of lead in the human body can cause poisoning, and low intake of lead may affect the human intelligence, nervous system and reproductive system. The global electronic assembly industry consumes about 60,000 tons of solder each year, and it is increasing year by year. The resulting industrial scum containing lead salts seriously pollutes the environment, so reducing the use of lead has become the focus of worldwide attention. Many large companies in Europe, Japan, South Korea, etc. are vigorously accelerating the development of lead-free alternative alloys, and have planned to gradually reduce the use of lead in electronic product assembly in 2002. (The traditional solder composition contains 63Sn/37Pb, and lead is widely used in the current electronic assembly industry). The European Union began to introduce lead-free technology in 2006, and from July 1st it banned lead in electronic products. The development of lead-free technology in the electronic complete machine industry is an inevitable trend in the development of the international information industry. my country’s Ministry of Information Industry also requires the country to achieve lead-free electronic information products before July 1, 2006.

2. Why use nitrogen for lead-free process?

Lead-free has put forward many new requirements for reflow soldering and other equipment, including: higher heating capacity, thermal stability under no-load and load conditions, materials suitable for high-temperature work, good thermal insulation, and excellent temperature uniformity Performance, nitrogen leak-proof ability, flexibility of temperature curve, stronger cooling capacity, etc. In the process, the use of nitrogen atmosphere can well meet these requirements, avoiding and reducing the defects generated in the welding process of the product.

The SMT special nitrogen generator is a special supporting nitrogen supply device developed on the basis of the general general nitrogen generator and combined with the technological characteristics of lead-free soldering in the SMT industry. Its purity is generally between 99.9% and 99.999%. The flow rate of the nitrogen generator for each welding furnace is generally 10 to 30 Nm3/hr (calculated according to the actual flow rate for special specifications), and the dew point is -40°C to -60°C. Nitrogen The pressure is about 0.5-0.6MPa. The SMT special nitrogen generator has stable performance, simple operation, easy maintenance, small footprint, and beautiful appearance, which effectively reduces the cost of use for the majority of users.