Why does the soldering iron tip not have a 380℃ tin coating?
It is absolutely impossible to solder the iron tip at 380℃ without tin.
So why do some customers report that the soldering iron tip cannot be tinned when using the 936 soldering station for lead-free soldering at 380°C? First of all, this 380°C was measured under a static condition, but the actual temperature is not such high at the moment of welding. Let me use the HAKKO936 soldering station as an example and everyone will understand.
Taking the HAKKO936 soldering station as an example, let's look at the relationship between temperature and welding speed in leaded and lead-free soldering:
Welding wire type melting point welding temperature welding speed
6337 welding wire 183℃ 350℃ about 4 seconds/piece
Lead-free soldering wire 220℃ 390℃ About 6 seconds/piece
Our normal welding speed is 3-4 seconds per soldering point, while the HAKKO936 soldering station performs lead-free soldering at 390°C for about 6 seconds per soldering point, and the domestic 936 soldering station takes even longer. Different soldering stations have different temperature compensation capabilities. The faster the better. The domestic 936 soldering station has poor temperature compensation capabilities and the temperature is not reached during normal welding. Therefore, some customers reported that the soldering iron tip was not tinned when using the 936 soldering station for lead-free soldering at 380°C.
Temperature measurement of lead-free soldering iron tips
The temperature of manual lead-free soldering is very important. It is a key indicator that affects the service life of the lead-free soldering iron tip, and is also an important indicator that affects the quality of the solder joints. Therefore, the measurement of the temperature of the soldering iron tip is very important.
So how to measure the temperature of the soldering iron tip?
1. First of all, buy a good soldering tip temperature tester.
2. Use the correct measurement method. During normal use of the electric soldering iron (soldering station), add tin to the tip of the soldering iron and directly contact it in the middle of the temperature sensing line of the temperature tester. The highest constant temperature measured is the actual soldering temperature. When measuring, many engineers use a tin wire to measure the soldering product. After the tin melts, the soldering iron head quickly leaves the temperature sensing point, so the measured temperature is the lowest temperature during soldering. (This temperature is dozens of degrees different from the temperature measured by the former) The main thing that a good lead-free soldering iron (soldering station) reflects is that the difference between the two temperatures should be small. The second is that the faster it goes from the lowest temperature to the highest constant temperature, the better. , which is what we call a quick recovery.
3. The optimal temperature of 350°C for lead-free soldering that we usually call is measured by the first method, not the second.
