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With iron power:   20W      25W      45W      75W    100W

temperature:        300℃   400℃   420℃   440℃   455℃

Generally the greater the power soldering iron, heat the greater the higher the temperature of tip. Welding integrated circuits, printed circuit boards, CO0S 20W circuit generally used in electric heat iron. Use the soldering iron power is too large, easy to scorch the components (general, transistor junction temperature exceeds 200 ℃, it will burn) and the printed wire off from the substrate: the power is too small to use a soldering iron, solder can not be fully melted , not out of the volatile flux, solder joint is not smooth, solid, easy to produce Weld, welding time is too long, will burn out the device, generally each spot within the 1.5 ~ 4 S.

3, other iron
1) constant temperature soldering iron
Electric soldering iron tip temperature within the temperature controller equipped with a magnet to control the power-on time, to achieve the purpose of constant temperature. In the welding temperature should not be too high, not too long welding time, the components should be selected temperature soldering iron, but it is high prices.
2) tin soldering iron absorption
Tin soldering iron absorption is the suction piston electric iron dissolved in tin and one desoldering tool with easy to use, flexible and applicable to a wide range of features. The downside is that you can only be removed to a spot welding.
3) gas soldering iron
One kind of use of liquefied petroleum gas, methane and other combustible gas burning heat of the soldering iron tip. For any inconvenience or unable to supply AC power supply situations.