Why import lead-free welding for SMT?

1. Why import lead-free welding? Lead is a toxic heavy metal. Excessive lead absorption can cause poisoning, while low levels of lead may affect human intelligence, nervous system, and reproductive system.

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2018-11-05

Why import lead-free welding for SMT?

1. Why Use Lead-Free Soldering?
Lead is a toxic heavy metal. Excessive lead absorption can cause poisoning, while even low levels may affect intelligence, the nervous system, and reproductive system. The global electronics assembly industry consumes approximately 60,000 tons of solder annually, a figure that continues to rise. The resulting lead-containing industrial waste severely pollutes the environment. Therefore, reducing lead usage has become a global focus. Many large companies in Europe, Japan, Korea, and elsewhere are actively accelerating the development of lead-free alternative alloys and have planned to gradually reduce the use of lead in electronics assembly starting in 2002. (Traditional solder contains 63Sn/37Pb; lead is widely used in the current electronics assembly industry). The European Union introduced lead-free processes in 2006, completely banning lead in electronic products starting July 1st. The lead-free development of electronic equipment technology is an inevitable trend in the international information industry, and China's Ministry of Information Industry also required the nationwide implementation of lead-free electronic information products before July 1, 2006.
 

2. Why Use Nitrogen in Lead-Free Processes?


Lead-free processes place several new demands on equipment such as reflow ovens. These include: higher heating capacity, thermal stability under no-load and load conditions, materials suitable for high temperatures, good thermal insulation, excellent temperature uniformity, nitrogen leak prevention capabilities, flexible temperature curves, and stronger cooling capabilities. Using a nitrogen atmosphere during processing effectively meets these requirements, avoiding and reducing defects during the soldering process.
SMT dedicated nitrogen generators are specialized nitrogen supply devices developed based on general-purpose nitrogen generators, combined with the process characteristics of lead-free soldering in the SMT industry. The purity generally ranges from 99.9% to 99.999%. The flow rate of the nitrogen generator for each soldering furnace is generally 10～30Nm3/hr (special specifications are calculated based on the actual flow rate), with a dew point of -40℃～-60℃, and a nitrogen pressure of approximately 0.5-0.6MPa. SMT dedicated nitrogen generators are stable in performance, easy to operate and maintain, and occupy a small area with an aesthetically pleasing design, effectively reducing the cost of use for customers. 

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