Intelligent Soldering Cartridge for Real-Time Solder Joint Validation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current soldering technologies, especially handheld and robotic point-to-point soldering, face challenges in ensuring high-quality solder joints due to factors like solder tip temperature, geometry, oxidation, and human error, leading to increased costs and faulty connections in PCB assembly and rework.
Innovation Solution
An intelligent soldering cartridge with a processor, temperature sensor, and image detection capabilities that adjusts the solder tip temperature and provides real-time feedback on solder quality by comparing 2D and 3D images of the solder joint, ensuring a reliable connection is formed within predetermined tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operators perform handheld soldering based on training, then soldering operations can be completed, but solder joint quality is inconsistent due to human error and lack of real-time guidance
Solution Approach 1:
The system captures real-time images of the solder joint during the soldering process, analyzes them using image processing algorithms, and provides immediate feedback to the operator about solder joint quality, enabling the operator to adjust their technique to achieve consistent high-quality results
Solution Approach 2:
The patent replaces manual visual inspection and operator judgment with an automated optical inspection system that uses cameras and image processing algorithms to objectively evaluate solder joint quality, eliminating variability due to human error
2Reliability
If automatic soldering uses open-loop time-based control, then the process is simple to implement, but solder joint quality cannot be validated in real-time
Solution Approach 1:
The system implements closed-loop control by capturing images of the solder joint during and after the soldering process, analyzing the images to detect liquidus occurrence and validate solder joint quality, and providing real-time feedback to confirm successful soldering or alert to defects
Solution Approach 2:
The system detects the liquidus point (solder melting point) by monitoring color changes in the solder joint during heating, using image processing to identify the characteristic color transition that occurs when the solder reaches its melting temperature and begins to flow
3Manufacturing precision
If solder tip temperature is not monitored and adjusted, then the soldering process is simpler, but solder joint quality varies due to temperature fluctuations
Solution Approach 1:
The system uses a temperature sensor to continuously monitor the solder tip temperature and provides real-time feedback to the heating element, enabling dynamic adjustment of heating power to maintain the solder tip at the optimal temperature range for consistent solder joint quality
Solution Approach 2:
The system dynamically adjusts the heating parameter (power to the solder tip) based on real-time temperature measurements, changing the heating intensity to compensate for heat loss to the workpiece and maintain stable solder tip temperature throughout the soldering process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The intelligent soldering cartridge enhances the quality of solder joints by providing real-time feedback and adjusting the solder tip temperature, reducing human error and improving the efficiency of both handheld and robotic soldering processes, leading to more reliable electrical connections and reduced costs.
Implementation Method 1
a heater for heating the solder tip
Implementation Method 2
a temperature sensor for measuring a temperature of the solder tip
Implementation Method 3
detecting liquidus occurrence at a solder joint from comparison of 2D images of the solder joint before and after the soldering event
Implementation Method 4
receiving a 3D current image of the solder joint after detection of the liquidus, determining volume of the dispensed solder after occurrence of the liquidus from the 3D current image
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An intelligent soldering cartridge that includes: a housing; a solder tip; a heater for heating the solder tip; a storage device for storing information about characteristics of the cartridge; a processor for retrieving the information about characteristics of the cartridge, monitoring the power level delivered to the solder tip to detect liquidus occurrence at a solder joint, determining a thickness of an intermetallic compound (IMC) of the solder joint using some of the retrieved information, determining whether the thickness of the IMC is within a predetermined range, and generating an indication signal indicating that a reliable solder joint connection is formed when the thickness of the IMC is within the predetermined range; and an interface for transmitting the indication signal.