Oxygen sensor is the use of ceramic sensitive elements to measure the oxygen potential in various types of heating furnaces or exhaust ducts, the chemical equilibrium principle to calculate the corresponding oxygen concentration, to monitor and control the furnace combustion air-fuel ratio, to ensure product quality and exhaust gas emissions to meet the standard measurement elements, widely used in various types of coal combustion, oil combustion, gas combustion and other furnace atmosphere control. It is the best combustion atmosphere measurement method, with the advantages of simple structure, rapid response, easy maintenance, easy to use, accurate measurement, etc. The use of the sensor for combustion atmosphere measurement and control can not only stabilize and improve product quality, but also shorten the production cycle and save energy. Sensors need to be metal package welding, where the quality of welding has a great impact on the application of sensors, the following to see the laser welding machine in the welding of oxygen sensors technology applications.
The oxygen sensor base is generally a stainless steel cylinder with a diameter of 20-40mm. The catalytic converter body consists of a stainless steel shell, white carrier, damping layer and catalyst, etc. In the production of the catalytic converter assembly, the oxygen sensor base needs to be welded to the catalytic converter shell.
Oxygen sensor base wall thickness of 5-12mm, the catalytic converter body shell thickness of 1mm-2mm, the difference between the two thickness is large, the existing welding process using arc welding once welding molding, the production process, the current is too large to cause the catalytic converter shell welding leakage, the current is too small oxygen sensor connection strength is not enough, so you can choose laser welding technology, laser welding machine selection of fiber laser, laser using Integrated structure, with safety protection and environmental protection, with a fully enclosed welding cabinet, compact structure and high integration. The gantry welding module is equipped with a multi-dimensional adjustment laser welding head, two-dimensional horizontal CNC high-precision table, with special fixtures to complete precision welding needs.
Laser welding machine in welding oxygen sensor technology applications:
1. Welding spatter is as small as possible.
Oxygen sensor base and catalytic converter body welding, the welding seam is very sensitive to welding spatter, on the one hand, the welding generated by the welding slag attached to the oxygen sensor seat and the surrounding area, may affect the accuracy of the sensor signal transmission, on the other hand, the catalytic converter body is a closed cylinder structure, if there is welding slag spatter to the catalytic converter shell internal, welding slag can not be automatically discharged, manual cleaning is also difficult to operate, residual welding slag on The catalytic converter service life and nvh performance reached cause hidden danger.
2. The weld seam must ensure the connection strength and high gas tightness requirements.
The catalytic converter becomes a gas processing device, the overall connection strength and gas tightness of the assembly is high, the weld seam between the base of the oxygen sensor and the catalytic converter body also has the same connection strength and gas tightness requirements. The thickness of the oxygen sensor base is generally 6-12mm, and the thickness of the catalytic converter body is generally 1.5mm-2mm. The difference between the two thicknesses is large, so the welding process window is very narrow, and fluctuations in current, differences in the state of the welded surface, and fluctuations in the welding gap can lead to defects such as weld leakage in the catalytic converter shell.
The above is the technical application of laser welding machine in welding oxygen sensors, automatic laser welding equipment is suitable for welding and processing automotive sensors, not only to ensure the quality of sensor welding, but also to improve the efficiency of processing. Oxygen sensor catalytic converter body is the most important part of the catalytic converter assembly performance to reach, high quality requirements of parts, high cost per piece, companies are extremely concerned about the quality of parts and pass rate.
