With the development of laser technology and automation technology and the mature application of the sensor production process, to master the core technology of laser welding of domestic enterprises, in further solving the traditional process of sensor accuracy is low, poor stability and other issues play a major role.
Advantages of laser welding
Compared with the traditional arc welding process, laser welding has many benefits:
- Selective energy application in a small area: reduced thermal stress and reduced heat-affected zone, very low distortion.
- Narrow joint seam and smooth surface: reduces or even eliminates reprocessing.
- High strength combined with low weld volume: the welded workpiece can withstand bending or hydroforming.
- Easy integration: can be combined with other production operations such as alignment or bending.
- Only one side of the seam needs to be approached.
- High process speeds reduce processing times.
- Particularly suitable for automation technology.
- Good program control: machine control and sensor systems detect process parameters and ensure quality.
- The laser beam can produce welded joints without contacting the surface of the workpiece or without applying force to the workpiece.
Sensor laser welding process
In the current rapid development of China's industrial market, the demand for sensors has changed from the original supporting to rigid demand. Especially on May 10 this year, the "14th Five-Year" National Key Research and Development Program, the first batch of key special projects released, "intelligent sensors" on the list, the future will be a systematic layout of intelligent sensing basic and cutting-edge technologies, sensor sensitive components key technologies, industry-oriented intelligent sensors and systems and sensor R & D support platform. The future will be a systematic layout of intelligent sensing basic and frontier technologies, sensor sensitive components key technologies, industry-oriented intelligent sensors and systems and sensor R & D support platform, integrated through the intelligent sensor design, manufacturing, packaging and testing and application demonstration links, the special sensor industry to lead the sustainable scale of development.
Sensors as high-precision testing instruments, especially in the military, aviation,applications are extremely demanding. To develop and produce highly accurate and stable sensors, a complete and effective manufacturing process is essential. Why?
The main reason is that such as pressure sensors, Hall sensors, photoelectric sensors, temperature sensors and other such sensors, there are sensitive components and integrated circuits inside, filled with inert gas or vacuum and isolated from the outside world, the production process has a pressure-resistant, airtight requirements, the welding strength, leakage rate and welding quality requirements are very high, especially the welding process requires a small deformation can not be on the internal components and microcircuits are damaged.
Laser welding uses laser as the welding heat source, with high energy density, centralized heating, fast welding speed and welding deformation and other advantages. As a variety of sensors currently use stainless steel, titanium alloys and a small amount of alloy materials and aluminum alloys in the shell, laser welding is particularly suitable for use in the sensor sealing welding by virtue of its unique advantages.
After laser welding, the sensor metal shell surface smooth without defects, the strength of the weld is comparable to the base material, and the welding process will not lead to the sensor internal photosensitive components damage, excellent appearance and sealing.
