This process upgrade targets all regular Cartridge Heater for mold heating, with the core change being the adoption of laser welding instead of traditional tin soldering. Laser welding achieves fusion connection between the lead wire and the tube body through high-energy focusing, increasing the welding point firmness by 30% and the temperature resistance from 150℃ to 200℃, which can adapt to the high-temperature working conditions of mold heating. Before the upgrade, some heaters had lead wire falling off due to softening of tin solder joints at high temperatures; after the upgrade, after 500 thermal cycle tests, the welding joints showed no loosening or falling off. During production, we added a welding strength inspection step, sampling 60% of samples per batch for pull testing to ensure welding firmness meets standards. In addition, laser welding reduces pollutant residues during welding, improving the insulation performance of products. Currently, this process has been applied to the production of all Cartridge Heater, and we will continue to optimize welding parameters to further improve product reliability.
