Electronics industry is globalization and market-orientate. The high tech and low cost are the trend of electronics industry, only keep the high quality and low cost, the company can take in the competitive market. There are lots of electronic industries such as computer, cellphone, TV and so on.
Nitrogen is as the protection element for electronics,semi-conduct and integrated circuit manufacture, the application such as welding, clean blow, packing, sintering, annealing, restore, storage, clean and chemical product recycle and etc. Normal temperature air separation is mainly for SMT equipment supporting the use of application of nitrogen in SMT placement machine reflow soldering and wave soldering with nitrogen can effectively inhibit the oxidation of solder, enhance the wettability of welding, and speed up the wetting reduce the production of tin ball, avoid bridge, reduce weld defects, get good welding quality.For nitrogen demand is generally high, usually need to 99.99%, and more than 99.99% of the nitrogen.Each form a complete set of welding furnace nitrogen flow generally is 10 ~ 30 nm3 / hr (special specifications according to the actual flow calculation), dew point to 40 ℃ ~ 60 ℃, the nitrogen pressure is about 0.5-0.6 MPa.SMT nitrogen making equipment stable performance, simple operation, easy maintenance, and covers an area of small, beautiful shape, effectively reduces the use cost of users.
1. Why lead-free welding
Lead is a toxic heavy metal that can be toxic if absorbed in excess. Low levels of lead can affect the brain, nervous system and reproductive system.Worldwide, the industry consumes about 60,000 tons of solder every year, and it is increasing year by year. As a result, the industrial residue containing lead salt seriously pollutes the environment. Therefore, reducing the use of lead has become the focus of the whole world.Many large companies in Europe, Japan, South Korea and elsewhere are accelerating the development of lead-free replacement alloys and have planned to begin reducing lead use in electronic assembly in 2002.(traditional solder ingredients contain 63Sn/37Pb, and lead is widely used in the current electronic coupler industry.)The European Union introduced lead-free technology in 2006 and banned lead in electronic products from July 1.The development of lead-free technology in the electronic machine industry is an inevitable trend in the development of international information industry. China's ministry of information industry also requires that before July 1, 2006, the national realization of lead-free electronic information products.
2. Why use nitrogen for lead-free processes
Lead-free equipment has put forward many new requirements for reflow welding equipment, including: higher heating capacity, thermal stability under no load and load conditions, materials suitable for high temperature work, good thermal insulation, excellent temperature uniformity, nitrogen leak-proof capacity, flexibility of temperature curve, stronger cooling capacity, etc.In the process, nitrogen atmosphere can be used to meet these requirements, avoid and reduce the product defects in the welding process.
The use of nitrogen in lead-free electronic assembly has the following requirements:
1. When meeting the requirements of customers from Europe, America, Japan and South Korea;
2. when using high temperature solder paste or low solid, low activity (no cleaning, low residue) solder paste;
3.brazing more expensive integrated circuit components, small size components, fine-spacing components, flip chip and can not reverse repair components;
4.When PCB with OPS coating is repeatedly backflowed through the plate assembly process or brazed for multiple times;
5.brazing no protective film brazing pad or longer storage time of circuit board or reliability first.
Today, when the global electronics manufacturing industry begins lead-free production, lead-free production in China's electronics industry will also be the general trend. In order to meet the lead-free standard, more and more manufacturers choose new reflow furnaces with nitrogen welding protection.
To meet the requirements of SMT industry with nitrogen, AETOK company on the basis of general nitrogen making machine, combined with the characteristics of the lead-free soldering, SMT industry especially developed in more than 99.99% of purity for SMT nitrogen gas solution, can ensure correct flux activation, reduce the amount of residual part flux, enhance the welding quality, and make welding surface more beautiful.
1.Nitrogen purity range: 99.99%～99.999%(adjustable).
2.High efficient, low capacity of compressed air, power saving, per m3 running 0.42 kwh.
3.The capacity of nitrogen generator can be improved easily, only connect with other machines.
4.Low dew point, the dew point of product can be ≤－45℃ to keep the quality of welding.
5.The machine can be shelled, good appearance and clean enough for the electronics industry.
Industry application cases