The heat absorption data of solar panel collectors are currently mostly selected through vacuum coating of aluminum blue film plates, with high heat absorption and low reflectivity. There are three main forms of combining aluminum blue film plates with copper pipes in solar water heaters.

1.Laser welding machine

The Laser welding machine heat absorbing material blue film layer is basically undamaged, and the fusion welding seam has high strength, good thermal conductivity, high thermal efficiency, long service life of the flat plate, and fast welding speed. And laser welded flat plates with good welding performance, thermal conductivity, strength, etc. are better than mechanical cladding and ultrasonic welding.

2.Mechanical packaging

The process of mechanical wrapping is simple, but it is not easy to wrap tightly, and the copper pipe will shake, resulting in poor contact and poor heat transfer performance. Over time, it is also prone to electrochemical corrosion, gradually reducing thermal conductivity.

3.Ultrasonic welding

Ultrasonic welding belongs to surface mechanical friction, mainly relying on metal bonding, and the physical metallurgical reaction is not obvious, not melting welding, so the strength is not high and the welding speed is slow. The front has damaged a 3-4 mm wide blue film, seriously affecting the light area and thermal conductivity.

Comparing the three methods, laser welding machine advantages are obvious. Previously, laser welding machines were used to reduce material damage, improve product quality, and reduce production costs; Adopting a duplex rotating workbench structure, the operator does not need to travel back and forth, reducing labor intensity and improving production efficiency.