Automotive engine intake manifold flanges connect the intake manifold to the engine cylinder head, requiring good air tightness, high temperature resistance, and vibration resistance, ensuring stable air intake and engine performance. Traditional mechanical fastening has air gaps, leading to air leakage and reduced engine efficiency, while adhesive bonding has poor high temperature resistance. DaokeDao laser welding is suitable for high-temperature-resistant PA and PP materials, forming an airtight weld with air leakage rate ≤0.05m³/h, ensuring stable engine air intake. The weld has high temperature resistance (up to 150°C), resists engine vibration without cracking, and maintains dimensional accuracy (tolerance ≤±0.03mm). The equipment supports large flange welding, cycle time 10-13 seconds per unit, suitable for mass production of engine component suppliers, improving engine efficiency and reducing fuel consumption.