TPO (thermoplastic polyolefin) materials will not leak water after welding, mainly because the two layers of TPO membrane are completely melted and firmly bonded through hot air welding technology to form a continuous, seamless waterproof layer. The welding process rearranges the molecular structure of the material, and the strength of the weld even exceeds that of the membrane itself, ensuring a high degree of sealing at the connection. This seamless connection method effectively prevents water penetration, thereby providing long-term and reliable waterproof performance.