What is reflow soldering?
Reflow soldering refers to the use of solder paste to connect one or more electronic components to the contact pads, and to melt the solder through controlled heating to achieve permanent bonding. Different heating methods such as reflow ovens, infrared heating lamps, or heat guns can be used. for welding. Reflow soldering is the most commonly used method for bonding electronic components to printed circuit boards by surface mount technology. Another method is to connect electronic components through through-hole mounting.
Motor function of reflow soldering?
The working temperature of reflow soldering is very high, and the main function of the motor is to drive the wind wheel to dissipate the heat.
How many temperature zones does reflow soldering have? What is the temperature? Which area is the key?
Chengyuan reflow soldering is divided into four temperature zones according to the function of the temperature zone: heating zone, constant temperature zone, soldering zone, and cooling zone.
Common reflow soldering in the market includes eight temperature zone reflow soldering, six temperature zone reflow soldering, ten temperature zone reflow soldering, twelve temperature zone reflow soldering, fourteen temperature zone reflow soldering, etc. These can be manufactured according to customer needs . However, only eight temperature zone reflow soldering is common in the professional market. For reflow soldering in eight temperature zones, the temperature setting of each temperature zone is mainly related to the solder paste and the product to be soldered. The function of each zone is quite critical. Generally speaking, the first and second zones are used as preheating zones, and the third and fourth five are the preheating zones. Constant temperature zone, 678 as the welding zone (the most important are these three zones), 8 zones can also be used as the auxiliary zone of the cooling zone, and the cooling zone, these are the core, it should be said that few zones are the key , Product quality must be improved, which area is the key!
1. Preheating zone
The preheating zone is heated to 175 degrees, and the duration is about 100S. It can be seen from this that the heating rate of the preheating zone can be obtained (because this detector adopts online testing, it has not entered the preheating zone for a period of time from 0 to 46S. , duration 146–46=100S, since the indoor temperature is 26 degrees 175–26=149 degrees heating rate; 149 degrees/100S=1.49 degrees/S)
2. Constant temperature zone
The maximum temperature in the constant temperature zone is around 200 degrees, the duration is 80 seconds, and the difference between the high temperature and the low temperature is 25 degrees
3. Reflow zone
The highest temperature in the reflow zone is 245 degrees, the lowest temperature is 200 degrees, and the time to reach the peak is about 35/S; the heating in the reflow zone
Rate: 45 degrees/35S=1.3 degrees/S According to (how to set the temperature curve correctly), it can be seen that the time for this temperature curve to reach the peak value is too long. The entire reflow time is about 60S
4. Cooling zone
The time in the cooling zone is about 100S, and the temperature drops from 245 degrees to about 45 degrees. The cooling speed is: 245 degrees—45 degrees=200 degrees/100S=2 degrees/S
Post time: Jun-12-2023