Hang Zhou Tronstol technology Co., Ltd.
Hang Zhou Tronstol technology Co., Ltd.

During the reflow process of the printed circuit board (PCB), the setting of the reflow temperature curve will greatly affect the strength of the solder joints. It is not only necessary to ensure that each solder joint meets the quality requirements, but also to ensure that the components and boards are not damaged.

 

The temperature curve is a function of the temperature applied to the component versus time, and it is specifically expressed as a curve of the temperature of the component on the circuit board with time during the reflow process. Theoretically ideal temperature curve consists of preheating zone, heat preservation zone (active zone), heating zone (reflow zone) and cooling zone. The first three zones are heated, and the last zone is cooled.

 

① In the preheating zone, heat the board from room temperature to around 150°. Preheating is to activate the solder paste and to avoid the rapid high temperature heating during the immersion of tin, which will cause defective parts. The goal of this area is to heat the board at room temperature as soon as possible, and the heating rate should be controlled within an appropriate range. If the temperature rises too fast, thermal shock will occur, and the boards and components may be damaged; if the temperature rises too slowly, the solvent will not evaporate adequately and affect the soldering quality.

②Insulation area (active area), generally 150°180°, within 200°. The activity of the solder paste is the strongest in this temperature range, and it is maintained for about 90s. The main purpose of the insulation stage is to stabilize the temperature of the internal components of the reflow oven, and to minimize the temperature difference of each part. Stay in this area for enough time to make the temperature of the larger components catch up with the temperature of the smaller components, and ensure that the flux in the solder paste is fully volatilized. At the end of the insulation stage, the oxides on the bonding pad, solder balls and component pins are removed under the action of the flux, and the temperature of the entire circuit board is also balanced.

③In the heating zone (reflow zone), the solder paste begins to melt and the time is between 60s and 90s. In this area, the heater temperature is set to the highest, so that the internal temperature quickly rises to the peak temperature. The peak temperature of the reflow curve is usually determined by the melting point temperature of the solder paste and the heat-resistant temperature of the boards and components. The peak temperature also varies depending on the solder paste used. Generally, the maximum temperature of lead-free solder paste is 230°-250°, and the maximum temperature of lead-containing solder paste is 210°-230°. Pay attention to the time in the heating zone not to be too long to prevent damage to the inner wall of the reflow oven, damage to electronic components or scorching of the circuit boards.

④ In the cooling zone, quickly reduce the temperature to solidify the solder paste. In this area, the temperature is cooled to below the solid phase temperature to solidify the solder joints. The cooling rate will have an impact on the strength of the solder joints. If the cooling rate is too slow, it will cause excessive eutectic metal compounds to be produced, and a large grain structure will appear at the solder joints, making the strength of the solder joint lower.

 

The reflow temperature curve of Sn63Pb37 solder paste is shown in the figure:

Kester_Reflow_Profile.png 

 

 

In actual production, the solder paste supplier will provide the reflow temperature curve. And the users can set the temperature curve with the assistance of the engineer.


Relate News
CONTACT US
jemma.zhang@tronstol.com
86-571-26265158
4th Floor, Building 5, No. 2, Huayi Road, Yuhang Street, Yuhang District, Hangzhou
Have a question ?
Get in touch
Whether you have a question about product features, shipping, site policies or anything else, we're here to help and ready to answer your questions.
Contact info
86-571-26265158
jemma.zhang@tronstol.com
4th Floor, Building 5, No. 2, Huayi Road, Yuhang Street, Yuhang District, Hangzhou
Offline Software - The User Manual Of CSV Change To XML Discussion About The SMT Solder Paste Knowledge The Advantage of Tronstol A1 mounter machine-(1) The Advantage of Tronstol A1 mounter machine-(2) Common Sense Of Tronstol A1 PNP Machine Maintain How to Use a Multimeter The Reasons and Solutions of PNP Drop Component What's the Grating Ruler What to Consider When Buying Pick and Place Machine What is SMT technology? Home Pick and Place Machine Pick and Place Machine TronStol A1 Reflow Oven D5 (Desktop) Semi-automatic Solder Printer YS350 Conveyor C08 Electric Feeder After-Sale Service Automotive ELEXCON 2020 Brochure About Trosntol ​Tronstol A1 Pick and Place Machine Line1 Tronstol 3V (Standard) Pick and Place Machine Line1 Auto Loader+Tronstol A1 Pick and Place Machine*2 Line1 How To Mount 0201 With Tronstol 3v P&p Machine Tutorial IC Placement Pick and Place machine Tronstol 3V General Questions of TronStol Products Soldering Robot Machine SMT Assembly Pick and Place Machine TronStol 3V Advanced Reflow Oven L5 Semi-automatic Solder Printer YS600 Conveyor C10 Vibration Feeder Our History Videos Communication Equipment Tutorial Feeder Installation Guide for Tronstol A1 2020 Electronica China Tronstol A1 Pick and Place Machine Line2 Tronstol 3V (Advanced) Pick and Place Machine Line2 Auto Loader+Tronstol A1 Pick and Place Machine*3 Line2 Solder Printer User Manual Adjustment Method of the Direction and Position of Components for LED Pick and Place Machine How Does the SMT Mounter Machine Production Line Work Processing Flow and Precautions of SMT Production Appearance Introduction Of Tronstol 3v Pick and Place machine Tronstol A1 FAQs of Pick and Place Machine TronStol A1 SMT Assembly Line Pick and Place Machine TronStol 3V Standard Reflow Oven D8 (Desktop) Semi-automatic Solder Printer YS1200 Conveyor C12 Label Feeder Factory Show Document Download IOT Tronstol A1 Pick and Place Machine Line3 Tronstol 3V (Standard) Pick and Place Machine Line3 Auto Loader+Tronstol A1 Pick and Place Machine*2 Line3 The User Manual Of Solder Paste Mixer Resolution and Accuracy of SMT Mounter Component Loader FAQs of Pick and Place Machine TronStol 3V Reflow Oven L8 Full-automatic Solder Printer PM400A Conveyor C15 IC Camera Honor Certificates & Patent Prototype SMT Line Application Consumer Electronics Tutorial-Machines Parts Introduction Tronstol A1 Pick and Place Machine Line4 Tronstol 3V (Advanced) Pick and Place Machine Line4 Auto Loader+Tronstol A1 Pick and Place Machine*3 Line4 Technique Support Selection and Function of Pick and Place Nozzle How To Mount Led With Tronstol 3v P&p Machine FAQs of SMT Accessories Brochure of Tronstol E1 Pick and Place Machine About TronStol Reflow Oven L12 Auto Loader SL400 Nozzle Quality Control Grating Ruler Sensors Makes PNP More Precisely Small Production SMD Line Medical Tronstol A1 Pick and Place Machine Line5 Tronstol 3V (Advanced) Pick and Place Machine Line5 Auto Loader+Tronstol A1 Pick and Place Machine*3 Line5 What Should Be Paid Attention to When Choosing SMT Equipment How To Use Vibration Feeder To Mount Sop16 Tronstol 3v P&p Machine SMT Label Feeder from Tronstol FAQs of SMT Assembly Line High Precise Screen Printing Table TP3040 Brochure of SR5331R Services & Resources Auto UnLoader XL400 Shipping Info Mass Production SMT Line Tutorial The calibration of Dcam Team Tronstol A1 Pick and Place Machine Line6 Tronstol 3V (Standard) Pick and Place Machine Line6 Tronstol A1 Pick and Place Machine*2 Line6 SMT Technological Process LED What Is the Difference between a Placement Machine and a Labeling Machine? Tutorial How To Install Tape&reel,tube ,tray In Tronstol 3v Mounter Machine FAQs of Other SMT Line Machines Blog FAQ Company News Tutorial-How to import a coordinate file Tronstol A1 Pick and Place Machine Line7 Tronstol 3V (Advanced) Pick and Place Machine Line7 Tronstol A1 Pick and Place Machine*2 Line7 The Details Process Of Reflow Soldering How to Deal with Problems in the Use of Mounter Machine? Contact Us Research & Development Tronstol A1 Pick and Place Machine Line8 Tronstol 3V (Standard) Pick and Place Machine Line8 Tronstol A1 Pick and Place Machine*2 Line8 The Different Between Manual Welding And Fully Automatic Welding Other SMT Line Machines The annual mobilization meeting in 2021 Tutorial Install Feeder Extension Board Search Result Reflow Oven Tronstol A1 Pick and Place Machine Line9 Tronstol 3V (Standard) Pick and Place Machine Line9 Tronstol A1 Pick and Place Machine*2 Line9 The Temperature Setting Method Of Reflow Soldering Several Common Ways to Assemble SMD Tutorial How To Update X And Y Drive Sitemap Stencil Printer Tutorial Appearance Introduction for Tronstol A1 Tronstol A1 Pick and Place Machine Line10 Tronstol 3V (Advanced) Pick and Place Machine Line10 Tronstol A1 Pick and Place Machine*2 Line10 Several Commonly Used Test Methods for PCB 404 Conveyor Tutorial How to make AD export CSV for Tronstol A1 Tronstol 3V (Standard) Pick and Place Machine Line11 Tronstol A1 Pick and Place Machine*2 Line11 What is the Assembly Process of Circuit Board? Privacy Policy Loader and Unloader Tutorial-12MM, 16MM, 24MM Reel tape installation for Tronstol A1 Tronstol 3V (Advanced) Pick and Place Machine Line12 Auto Loader+Tronstol A1 Pick and Place Machine*3 Line12 Several Factors Affecting the Solder Paste Printing Process Submission Successful! Tutorial How To Install And Use Vibration Feeder On Tronstol A1 Pick And Place Machine Introduction of the Types of Smt Mounter Machine Mount Head Soldering Machine Taggg Solder Paste Mixer What Indicators Need to Be Tested Before the SMT Production? What should Be Considered when Starting SMT Mounter Machine? How to Optimize Smt Mounter Machine Equipment? Solder printer Tronstol TP3040 Selection of Suction Nozzle of Pick and Place Machine Accessories Performance Evaluation Method of Pick and Place Machine Notes for the Use of the Pick & Place Machine The Functions of Suction Nozzle of Pick and Place Machine Who Is Tronstol Tp3040(high Precise Screen Printing Table) How to adjust the temperature curve of solder paste What is PCB? New innovation for stencil printer- Tronstol TP3040 Tronstol 3V desktop PNP Machine Precautions for using PNP machine How to Improve the Efficiency of Pick and Place Machine Footprint and Packing of SMT Components SMT Mounter Machine Industrial Computer and Information Processing Technology SMT Mounter Machine Mechanical Movement Technology SMT Mounter Machine Vision Inspection and Sensor Technology Automatic Control Technology of SMT Mounter Machine The Solution to the Error of the Rotary Motor of the LED Pick and Place Machine How to Improve the Placement Speed of the Pick and Place Machine? The Three Major Development Trends of the Pick and Place Machine in the Future The Influence of the Suction Nozzle of the Small Pick and Place Machine on the Placement Rate Four Forms of Common Feeder Some knowledge about SMT What is BGA Why choose Tronstol MR30 drawer reflow oven Detailed Introduction of the Workflow of SMT Mounter Automatic Patch Machine Can Meet Your Needs! How to Solve the Problems of Abnormalities in the LED Placement Machine Pickup? Notes on SMT Mounters Processing and the Advantages Characteristics and Applications of the Tabletop Pick and Place Machine Reasons Why the Feeder Affect the Pick and Place Efficiency of the SMT Pick and Place Machine The Difference Between Multi-function Pick and Place Machine and High-speed Pick and Place Machine How to Deal with the Alarm of SMT Pick and Place Machine?