Precision PCB Fabrication, PCB Assembly, Components sourcing,  No MOQ...
You are here: Home » About Us » PCB Blogs » Knowledge » Temperature setting of lead-free reflow soldering

Temperature setting of lead-free reflow soldering

Inquire

facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
kakao sharing button
snapchat sharing button
sharethis sharing button

The melting point of lead-free solder paste is 217 degrees. The common composition of lead-free solder paste is: Sn/Ag/Gu, and its ratio is: 96.5/3.0/0.5. China PCBA factory SYS Technology takes tin-silver-copper solder paste as an example to explain what temperature set of the lead-free reflow soldering in each temperature zone.


Lead-free reflow soldering temperature profile


1. Temperature setting of lead-free reflow preheating zone


The preheating zone is heated to 175 degrees, and the time is about 100S, from which the heating rate of the preheating zone can be obtained (because this tester uses an online test, it has not entered the preheating zone during the period from 0 to 46S, and the time is 146 -46=100S, since the room temperature is 26 degrees, the heating rate is 175-26=149 degrees; 149 degrees/100S=1.49 degrees/S).

2. Temperature setting of lead-free reflow soldering constant temperature zone


The maximum temperature of the constant temperature zone is about 200 degrees, the time is 80S, and the difference between the maximum temperature and the minimum temperature is 25 degrees.

3. Temperature setting of lead-free reflow soldering 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 rate in the reflow zone is: 45 degrees/35S=1.3 degrees/S. it can be seen that the time for this temperature curve to reach the peak is long. The whole reflow time is about 60S.

4. Lead-free reflow soldering cooling zone temperature setting


Cooling zone's time is 100s.


Table of Content list
Sign up for our newsletter

PCB Fab

PCB Assembly

Capabilities

CONTACT US
General Inquiry
Email: sales@syspcb.com
Phone: +86-0769-82201689
Fax: +86-0769-87799518

Tech Support
Email: tech@syspcb.com
Phone: +86-0769-82201689
SOCIAL NETWORKS
Copyright © 2024 SYS Technology Co., Ltd. All Rights Reserved.|Privacy policy|sitemap
We use cookies to enable all functionalities for best performance during your visit and to improve our services by giving us some insight into how the website is being used. Continued use of our website without having changed your browser settings confirms your acceptance of these cookies. For details please see our privacy policy.
×