What is Wave Soldering Technology How does wave soldering work?

DW300 series wave soldering.

How Wave Soldering Works:

Automatic board feeding - flux spray - product preheating (1 2 3 different models are different) - wave soldering (through the tin melted at high temperature mechanical pump to produce the tin liquid into a wave peak, through the product and the tin liquid contact time and temperature to achieve the purpose of welding) - cooling - out of the board.

Wave soldering is a process technology that uses pump pressure to form a solder wave of a specific shape on the surface of molten liquid solder, and when the assembly assembly of inserted components passes through the solder wave at a certain angle, a solder joint is formed in the pin solder area. The components are preheated in the welder preheating area during the conveyor conveyor process (the preheating of the components and the temperature they reach are still controlled by a predetermined temperature profile). In actual welding, it is often necessary to control the preheating temperature of the component face, so many devices have added corresponding temperature detection devices (such as infrared detectors).

After preheating, the components enter the tin bath for soldering. The tin bath contains molten liquid solder, and the nozzle at the bottom of the steel bath sets the fused solder into a fixed shape of the wave, so that when the welding surface of the component passes through the wave, it is heated by the solder wave, and at the same time, the solder wave also wets the solder area and expands the filling, and finally realizes the soldering process. Leichen AIS20X series products support one-click data export, and the data can be effectively connected with the EMS system, which is very convenient to use.

Wave soldering actual workflow.

It is done by beating the solder paste on the hard board and heating it through a welding machine to cool down. Get the job done.

The working principle is very simple, spray rosin first, preheat, tin, cool down, and finish.

I learned about the principle of the AIS43X series products of Leichen Technology, which is to accurately measure the height through the high-restoration 3D structured light imaging system and algorithm, effectively provide a basis for judgment, and help to judge defects and defects more accurately.

Introduction to the principle of wave soldering.

Wave soldering is a process in which molten liquid solder is formed into a solder wave of a specific shape on the liquid surface of the solder tank with the help of a pump, and the PCBA with inserted components is placed on the conveyor chain, and the solder joint is welded through the solder wave at a specific angle and a certain immersion depth.

The surface of the crest surface is covered by a layer of oxide scale, which is almost static along the entire length of the solder wave, during the wave soldering process, the PCB touches the leading surface of the tin wave, the oxide scale is broken, and the tin wave in front of the PCBA is pushed forward without wrinkles, which shows that the whole oxide scale moves the wave soldering machine solder joint forming at the same speed as the PCB: when the PCBA enters the front end of the crest (A), the substrate and the pins are heated, and before leaving the crest surface (B), The whole PCB is immersed in the solder, that is, bridged by the solder, but at the moment of leaving the tail of the wave, a small amount of solder adheres to the pad due to the action of wetting force, and due to the surface tension, it will shrink to a minimum state centered on the lead, and the wetting force between the solder and the pad is greater than the cohesive force of the solder between the two pads. As a result, full, rounded solder joints are formed, and excess solder that leaves the tail of the crest falls back into the pot due to gravity.

The difference between wave soldering and selective wave soldering: wave soldering is to contact the entire circuit board with the solder surface and rely on the surface tension of the solder to climb naturally to complete the soldering. For large heat capacity and multi-layer circuit boards, wave soldering is difficult to meet the requirements of tin penetration.

The choice of wave soldering is different, the welding nozzle is punched out of the dynamic tin wave, and its dynamic strength will directly affect the vertical tin penetration in the hole; Especially in lead-free soldering, dynamic and powerful tin waves are required due to their poor wettability. In addition, oxides are not easily left on the crests with strong flow, which also helps to improve the quality of the weld.

Selective wave soldering form.

When wave soldering cannot complete through-hole group welding (defined in some special products, such as automotive electronics, aerospace, etc.), at this time, with the help of programmable selection and welding of each solder joint, it is more stable than manual soldering and soldering robots, and the temperature, process, welding parameters and other controllable and repeatable control.

Double-wave soldering form.

It is recommended to consult Este (Shenzhen) Intelligent Technology **** (formerly Xin Chenfeng Technology) Este (Shenzhen) Intelligent Technology **** is a high-tech company dedicated to the PCBA board welding and cleaning industry, providing customers with high-quality selective wave soldering and PCBA water cleaning machines. Founded in 2004, the company has its own scientific research team, supporting the service team, to provide customers with perfect pre-sale, in-sale and after-sales system services, the company and the United States RPS company and the United States TDC company for technical cooperation, and for the United States RPS selective wave soldering system and the United States TDC brand PCBA water cleaning machine in China, to further promote the industry's selective wave soldering and washing machine technology progress, become the leader of China's electronics manufacturing industry.

Selective wave soldering, also known as selective welding, the application of PCB plug-in through-hole welding equipment, due to different welding advantages, in recent years in the field of PCB through-hole welding, there is a gradual trend of through-hole welding, the application range is not limited to: military electronics, aerospace ship electronics, automotive electronics.

Multi-layer PCB through-hole soldering with high welding requirements and complex processes such as digital cameras and printers.

Offline selective wave soldering: Offline refers to the way of offline with the production line, and the group flux spraying machine and selective welding machine are split 1+1, in which the preheating module follows the welding department, manual transmission, man-machine combination, and the equipment occupies less space.

Selective wave soldering: The system can receive production line data in real time, fully automatic docking, and the integrated structure of the flux module, preheating module, and welding module, characterized by automatic chain transmission, the equipment occupies a large space, and is suitable for the production mode with high automation requirements.

Selective wave soldering is a type of soldering. Selective spraying of flux only for the points to be soldered is greatly improved the cleanliness of the circuit board and the amount of ionic contamination is greatly reduced. If the Na+ ions and Cl- ions in the flux remain on the ** circuit board, they will combine with the water molecules in the air to form salts for a long time, which will corrode the circuit board and solder joints, and eventually cause the solder joints to open the circuit.

Therefore, the traditional production method often needs to clean the soldered circuit board, and selective wave soldering fundamentally solves this problem.

The main way of wave soldering and wave selection is that the size of the contact wave is different, the wave selection is point contact, wave soldering small surface contact, and the welding efficiency will be higher through the flowing tin surface, but for the double-sided mixed board, it is higher than the 5mm device height, and the wave soldering can not achieve the effect of fine soldering and tin dragging, so we will choose selective wave soldering to supplement the double-sided mixed small batch, and the company will use it instead of ferrochrome for repair welding (single product).