Selective wave soldering is an advanced soldering technology mainly used in the manufacturing process of electronic products, especially in complex and delicate electronic assembly. The main steps of selective wave soldering process include flux spraying, preheating, soldering, and cooling. In the stage of flux spraying, according to the product characteristics and process requirements, spot spraying or mist spraying can be selected for flux spraying to help the solder better wet and adhere to the welding surface. The preheating stage is to achieve optimal flux activity while reducing the impact of moisture and volatile substances on welding quality. The welding stage is the core of selective wave soldering technology, which requires controlling parameters such as welding temperature, time, and nozzle movement speed to ensure welding quality. Finally, the cooling stage is to solidify the solder joints and enhance the welding strength.
Working principle
Selective wave soldering technology achieves selective soldering of specific components by precisely controlling welding parameters such as temperature, time, and wave height. Its working principle is to use specially designed welding equipment to accurately spray molten solder (usually tin lead alloy) onto the parts that need to be welded through specific nozzles.
FEATURES
Selective wave soldering has many significant technical features. Firstly, it can achieve selective welding, that is, only welding the parts that need to be welded, avoiding thermal effects on the parts that do not need to be welded. Secondly, due to its precise control mechanism, selective wave soldering can provide high-quality welding results, including high strength, low porosity, etc. In addition, due to its high production efficiency, selective wave soldering has significant advantages in mass production.
Application of Selective Wave Soldering:
Selective wave soldering has a wide range of applications in many fields, including but not limited to the following:
Surface Mount Technology (SMT)
Selective wave soldering is widely used in surface mount technology for soldering fine pitch and coplanar pinless electronic components (CSPs) as well as ball grid arrays (BGAs).
Hybrid technology
For hybrid technology, selective wave soldering can effectively handle various types of components, including surface mount components, through-hole insert components, as well as large, small, and irregular components.
Special applications
In some special applications, such as high reliability or high-temperature environments, selective wave soldering has become an ideal choice due to its excellent welding quality and reliability.
The main steps and key points of selective wave soldering process:
1. Flux spraying: The process flow of selective wave soldering includes flux spraying. According to the product characteristics and process requirements, spot spraying or mist spraying can be selected for flux spraying.
2. Preheating: Preheating is an important step in selective wave soldering and needs to be adjusted to the optimal conditions to achieve the best flux activity. Preheating time, temperature, output power, and preheating module combination are key parameters that affect welding quality.
3. Welding: During the welding process, it is necessary to control parameters such as welding temperature, time, and nozzle movement speed to ensure welding quality. Continuous high-purity nitrogen protection is crucial for the stability and welding quality of welding nozzles.
4. Nozzle selection: Welding nozzles are important accessories for selective wave soldering machines, with multiple sizes to choose from. Choosing the appropriate nozzle based on product characteristics and process requirements can improve welding quality and efficiency.
5. Defect control: Selective wave soldering can reduce defect rates and improve welding quality by precisely controlling welding parameters. Common defects include soldering, non soldering, and poor soldering, which require adjusting welding parameters and processes according to specific situations.
6. Process optimization: The process optimization of selective wave soldering is the key to improving welding quality and efficiency. It is necessary to continuously adjust and optimize welding parameters based on product characteristics and process requirements, such as flux spraying amount, welding time, peak height, etc.
