Oxygen sensor is a measurement element that uses ceramic sensitive elements to measure the oxygen potential in various heating furnaces or exhaust ducts, and calculates the corresponding oxygen concentration by the chemical equilibrium principle to monitor and control the combustion air-fuel ratio in the furnace to ensure the quality of the product and exhaust gas emission standards, which is widely used in various coal combustion, oil combustion, gas combustion and other furnace atmosphere control. 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 equipment in the welding of oxygen sensors technology applications.
Oxygen sensor base is generally 20-40mm diameter stainless steel cylinder, catalytic converter body consists of stainless steel shell, white carrier, damping layer, catalyst, etc. In the production of catalytic converter assembly, the oxygen sensor base needs to be welded to the catalytic converter shell. Wuhan Ruifeng photoelectric laser seventeen years focus on the development and production of laser equipment, with years of experience in the development of laser equipment, product technology is mature, product performance is safe and stable. The company follows the business philosophy of "technological innovation, product innovation, service innovation" to provide customers with the best quality products and services.
Oxygen sensor base wall thickness of 5-12mm, the catalytic converter body shell thickness of 1mm-2mm, the two thickness difference 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 insufficient, 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 equipment 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 equipment 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.
