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The proper use of lead-free solder tape

2017-03-15 SourceJuRen PV Click:

With the implementation of the EU ROHS directive in June 2006, China's PV industry is facing the choice of lead-free lead, lead-free solder tape with the traditional tin-lead solder compared to the existence of many shortcomings, how to overcome these shortcomings are many photovoltaic Manufacturers need to solve the technical problems.

    Lead-free solder according to the coating of the solder composition is divided into many kinds, China's lead-free solder is the most extensive 305 solder, which contains 3% silver, 0.5% copper, the advantages of this solder is good solderability, solder Of the high temperature, the melting point is 218 ℃, used in the welding of the battery chip on the welding temperature is very high, ordinary internal heat soldering iron is difficult to meet the temperature requirements, so lead-free welding with high-power soldering iron, Recommended principle is higher than the lead-free solder welding 30-40W, for example, the original use of 35W soldering iron, then lead-free welding to use more than 70W soldering iron.

    Lead-free solder flow is poor, when the solder to be coated with tin and other solder soldering after the soldering iron, take the iron speed is slow, soldering iron soldering the melting of the solder slowly move, if found to have solid or incomplete solder Melting the phenomenon, indicating that the tip of the temperature compensation is not enough, the tip of the temperature has been lower than the melting point of solder, the market a lot of lead-free thermostat soldering iron most likely to happen this phenomenon, when the temperature reaches 400 ℃ of the electric tip Battery chip, the tip temperature will suddenly drop below 250 ℃, making welding difficult to continue. It is recommended that the manufacturer choose the leadless soldering station of the soldering iron head, adjust the temperature of the soldering iron by adjusting the DC voltage, do not use the thermo-chip control thermostat soldering iron. Welding different types of battery chip on the requirements of the soldering iron is not the same, the general thickness of the battery chip on the requirements of the soldering iron to be higher, large area of the battery chip on the iron requirements higher. Selection of DC lead-free soldering station can basically solve the problem of welding temperature.

    Lead-free solder tape will soon change color after welding, this is because lead-free solder easier to oxidation, is a normal phenomenon.

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