Temperature efficiency is a direct reflection of heat transfer efficiency. PSA nitrogen machine high thermal conductivity, stability and the actual stability of the equipment set on the small, fast temperature compensation ability is poor, the production elasticity coefficient is large, can be used in different production volumes, different sizes of product heat capacity, if the temperature efficiency is good, the actual peak temperature of lead-free solder 240℃, 290℃ will reach the set temperature or higher, Thus, the service life of the motor is reduced, and in hot air at high temperatures, temperature efficiency is a very important parameter, which determines whether the equipment can be lead-free production requirements. According to the characteristics of lead-free reflow soldering process, the principle of heating, cooling, management and nitrogen flux transformation in reflow furnace and the program of the system are discussed. The cost estimation and contrast of the evaluation standard nitrogen protection system, nitrogen and nitrogen generator for canning two kinds of supply systems are given. Lead-free technology of the electronic machine industry is the inevitable trend of the development of the international information industry industry, China's Ministry of Information Industry also required July 1, 2006, the national realization of electronic information products lead-free electronic assembly gradually realized in no lead, lead-free solder melting point, low wettability of the actual welding process has brought great changes. Pressure swing adsorption nitrogen production equipment manufacturers should be furnace structure and new design features and improvements to meet lead-free welding requirements, including heating systems, process control systems, flow management systems, cooling systems and nitrogen protection systems. For the implementation of lead-free electronic assembly, many companies do not take the initiative, but only in terms of various pressures to lead-free technology, including laws, regulatory pressures, environmental awareness, market interests, user needs, hazardous substances management processes and lead-free technology. Many new requirements on lead-free reflow welding equipment include: high thermal stability of heat capacity, no-load and load status, suitable for high temperature materials, with good thermal insulation, nitrogen blocking ability, flexibility of temperature curves good average temperature greater heat dissipation capacity. At present, there are thousands of old production lines on the domestic market, and if you want to replace all the new equipment with lead-free conversion by the equipment manufacturer through purchase, it is a good opportunity, but the PSA nitrogen machine suitable for electronic assembly factories is a heavy burden. At present, a new reflow equipment is usually about 300,000, plus additional features such as rapid cooling, nitrogen, etc., the cost is considerable. For electronic assembly plants, especially to reduce the profits of enterprises, and strive to find some simple ways to meet the challenges of lead-free transformation. In the face of such problems, according to the equipment of the old production line and the characteristic requirements of the new product, the old production line can be transformed from the following.