How to choose a soldering iron (lead-free soldering station for components) in factories

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How to choose a soldering iron (lead-free soldering station for components) in factories

Lead-free soldering is now common, and factories cannot purchase electric soldering irons (soldering stations) based on traditional concepts. Although ordinary temperature-controlled electric soldering irons on the market can be set to 400 degrees or higher, in fact, their heat capacity and temperature recovery capabilities are often insufficient to handle lead-free high-temperature soldering in the case of colder solder joints. During soldering, the heat consumption capacity of lead-free tin wire, which has a melting point about 34°C higher than that of lead-free tin wire, is relatively large. If an ordinary temperature-controlled soldering station is used for soldering without increasing the temperature (especially when the solder joint area is large), insufficient heat energy replenishment will often cause burrs on the tin joints, cold solder joints, and slow soldering speeds. Therefore, in order to achieve the appropriate welding effect, the soldering temperature of the soldering iron must be increased accordingly, but increasing the welding setting temperature will also bring many negative effects.

A. Lead-free tin wire is more susceptible to oxidation than lead solder wire, and high temperature acts as a catalyst. The oxidation rate increases exponentially with the increase of temperature. Therefore, welding at extremely high temperatures is very likely to cause mechanical contact type cold soldering (the solder does not form a molten alloy layer between the workpieces being welded) and grayish white solder joints that are not bright.

B. An ideal soldering iron does not need to be idle at a high temperature, eliminating energy storage, and instantly applying the energy obtained from the power supply directly to the welding point. This can both minimize energy loss and achieve good welding. However, ordinary soldering irons cannot achieve this due to their slow heating speed. They can only store enough heat energy to reach the temperature required for the welding load by increasing the idle temperature. However, higher temperatures will have a great thermal shock on delicate components, directly or indirectly affecting the circuit performance and the performance of the entire machine.

C. Generally, electronic factories, especially optoelectronic product factories, have strict control over the setting of welding temperature. The lower the temperature setting, the better, provided that the welding conditions can be met. Therefore, a higher welding temperature cannot meet the welding process requirements set by the factory.

When purchasing a lead-free soldering station (soldering iron), you must first ensure two points:

1. Ensure the welding temperature is around 350℃

2. Ensure welding speed of 3-4 seconds per welding point

      Only those that can guarantee the above two points can be called lead-free soldering stations. It is not advisable to increase the soldering temperature in order to ensure the soldering speed, as this will affect the quality of the solder joints and shorten the service life of the soldering iron tip.

    Lead-free soldering stations (soldering irons) generally have several powers of 80W, 100W, 120W, and 150W. For most solder joints, an 80W lead-free soldering station (soldering iron) can meet the needs. If the solder joint is too large, you can choose a lead-free soldering station (soldering iron) with a higher power.

      In short, when purchasing a lead-free soldering station (soldering iron), you must ensure the above two points. A lead-free soldering station (soldering iron) that cannot meet the above two points cannot be called a true lead-free soldering station (soldering iron).

Welding wire type
Melting point
Soldering temperature
Welding speed
6337 welding wire
183℃
350℃
About 4 seconds/piece
Lead-free solder wire
220℃
390℃
About 6 seconds/piece
Soldering station type
Soldering temperature
Welding speed
Soldering station price
Heating core price
Soldering Iron Tip Price
936 soldering station (two-wire heating core)
450℃
About 4 seconds/piece
100-200 Yuan
About 20 yuan
2-10 yuan
936 soldering station (three-wire heating core)
400℃
About 4 seconds/piece
400-800 Yuan
30-80 Yuan
6-50 yuan
936 soldering station (large power type)
380℃
About 4 seconds/piece
About 500 yuan
30-80 Yuan
8-50 Yuan
High frequency heating lead-free soldering station
350℃
About 4 seconds/piece
650-1000 Yuan
70-150 Yuan
8-50 Yuan
Lead-free soldering station with integrated heating core
350℃
About 3 seconds/piece
2000 yuan or more
All in one
100 yuan or more
Precious metal heating element soldering station
350℃
About 3 seconds/piece
1800 yuan or more
expensive
20-50 Yuan
Reference address:How to choose a soldering iron (lead-free soldering station for components) in factories

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