Automotive rearview mirror heating sheet housings protect the heating sheet, playing a defrosting and defogging role, requiring good sealing, heat resistance and electrical insulation, ensuring normal operation in cold and humid environments. Traditional assembly processes have poor sealing, easy entry of moisture, leading to heating sheet short circuit and failure. DaokeDao laser welding provides a sealed and insulated connection scheme for PC and ABS housing materials, forming a dense weld, blocking moisture intrusion, ensuring the normal operation of the heating sheet. The weld has good heat resistance, adapts to heating sheet working temperature, does not deform or age, with good electrical insulation performance, avoiding electric leakage risks. The welding process is precise and efficient, with no damage to internal heating sheets, suitable for mass production of rearview mirror suppliers, improving product reliability and ensuring driving safety in cold weather.