Dynamic strong short-wave infrared preheating

    Nitrogen technology throughout the remaining oxygen in the tunnel PPM value is artificially set, and closed loop control, more than just adding nitrogen in the hood above the tin bath method much better; This is because the latter is the value of remaining oxygen PPM not controlled, can only regulate emissions of nitrogen

Flow, and nitrogen consumption is large than the former.  Nitrogen technology has been the entire tunnel at the high end electronics and the manufacture of welding production volume widely used.
wire cable trays, cable management systems, basket cable tray
    Dynamic strong short-wave infrared preheating

    In the new lead-free wave soldering machine, preheat a variety of modes, the combination of their good effect. Preheat ways: medium wave infrared, short wave infrared and hot air convection in three ways. ERSA company also introduced a new called "dynamic

Preheat strong state "technology.

    Preheating module of the system is composed of multiple quartz heating tube, do not use all the same power, but according to the size and location of the board, only one of several groups of quartz heating tube dynamic time-sharing power. For small and medium-size circuit boards

Words, the module's power consumption can be reduced by about 50%.

    Then, in the warm-up mode, we should be more than how to mix the effects of each warm-up different? The answer is that Poland is the basic, generally always open, short-wave is like a rapid reaction force, power is immediately heat, power immediately

Cooling, it is usually installed in the preheating tail section, closest to the weld area. Short warm-up is conducted before  the board into the welding-type heating last sprint, when the board came open, more power.

    For hot air preheating, depending on choice of flux types. If you use a water-based flux, the most in the warm front, the choice of hot air convection preheating help speed up the evaporation of moisture flux to avoid the tiny water droplets into the high-temperature solder pot, lead

Splash from the tin. If the selected organic solvent flux, then preheat the more appropriate medium wave.

    Generally good equipment, warm-interchangeable   modules should be designed, no matter what kind of warm-up module, the width should be the same, so you can keep warm under the different modules need to be replaced.

    "Product of copper" in response

    Lead-free wave soldering will also bring us a new problem - "Integrated Copper" phenomenon. Lead-free solder has a strong corrosive, high temperature welding environment, it will continue to strip the copper atoms on the pad, tin pot copper content with time

The passage of time (such as three months) continued to rise. Copper with tin solder excessive chemical reaction between the metal compound Cu6Sn5, it will be in the form of needle-like, see Figure 8 and Figure 9.

This solder will be greatly reduced mobility, resulting in more solder bridging. Research shows that the "product of copper" can not be exceeded 1% of the limit. The solution is, in time to join SnAg alloy solder pot.

    Conclusion

    For lead-free wave soldering is to ensure good welding quality is not easy; and want to ensure the welding quality at lower cost is more difficult. For customers, the choice of equipment, need to plant their own quality standards, circuit board soldering 

The degree of difficulty, production volume, solder unit, and the initial investment costs and operating costs, calculate the total operating costs to be considered comprehensive.