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Ultrasonic welding and Laser welding equipment What are the differences? At present, the advantages and disadvantages of welding process play a decisive role in the heat transfer of flat plate solar collector. In China, the mainstream welding of flat plate solar water heater collector (collector plate) is laser welding and ultrasonic welding. The heat absorption plate of flat plate solar collector mainly adopts aluminum sheet and copper sheet, and the flow channel basically adopts copper tube, These two welding methods have their own advantages in practical application.

Advantages of laser welding vs   Advantages of ultrasonic welding

Laser technology The utility model has the advantages that the welded parts do not need to be pressurized, the overall deformation is small, and the surface of the heat absorbing coating can be damaged to a minimum; However, laser welding will also affect the change of the physical structure of the welded object. The solder joint is frequently impacted by the alternating cold and heat, which is easy to lead to fracture and poor strength, which is particularly fatal to the alternating cold and heat caused by the intermittent work of the flat plate collector day and night.

Ultrasonic metal welding has the advantages of non melting of welding materials, non fragile metal characteristics, short welding time, high fusion strength and close to cold processing; However, it will destroy about 3% of the heat absorbing layer, and the welded metal cannot be too thick (generally ≤ 5mm, which becomes an advantage for the welding of flat solar heat absorbing plate). Moreover, because it is a continuous non melting welding, the heat conduction efficiency is relatively good. Some people have done experiments. Under the same working conditions, the heat conduction efficiency of ultrasonic welding products is about 3% higher than that of laser welding.

Ultrasonic metal spot welding machine is used for similar welding of metals, and can carry out single point and multi-point short strip welding for fine and thin materials of copper, silver, aluminum and nickel non-ferrous metals. It can be widely used for welding of fuse links, lugs of lithium batteries and other shapes.

Ultrasonic metal spot welding machine adopts electronic program control, with high power, high efficiency, automatic control, easy operation, built-in electronic protection circuit, safe use, stable and reliable operation. The weldment has the characteristics of firm welding surface, high strength, subjective and environmental protection.

Laser welding vs ultrasonic welding

Laser technology uses a polarizer to reflect the beam generated by the laser to concentrate it in the focusing device to produce a beam of huge energy. The laser focus emitted through the pulse moment reaches thousands of degrees Celsius, which will melt and evaporate the metal materials within a few milliseconds. This effect is used to weld the plate core channel of solar collector and high selective heat absorbing coating, A solder joint is arranged on the solar heat absorbing film at an interval of 3 ~ 5mm.

It belongs to non-contact welding and can be transmitted for a long distance before being highly concentrated to provide functions such as welding, cutting and heat treatment. Its advantage is that there is no need to pressurize the welded parts, the overall deformation is small, and the heat absorbing coating surface can be damaged to a small extent. This is also an important reason why the industry opinion oriented laser welding is better than ultrasonic welding, but laser welding will change the physical structure of the welded object, deteriorate the mechanical strength, and have a certain impact on the thermal conductivity. At present, the representative manufacturers of laser welding in China include Han nationality laser, Lianying laser, Chutian Laser and other enterprises.

Ultrasonic welding is the physical connection of the welded metal at room temperature by using the high-density energy generated by ultrasonic high-frequency mechanical vibration to produce plastic deformation on the workpiece surface and destroy the surface layer under pressure. Although ultrasonic welding will destroy about 3% of the film, it is relatively good in heat conduction efficiency because it is a continuous non melting welding. At the same time, in terms of material cost, ultrasonic welding has certain advantages. Ultrasonic welding is suitable for thin products. The copper plate of the international mainstream flat product is generally between 0.12mm-0.2mm. In order to consider the material cost, some enterprises now choose aluminum plate and ultrasonic welding can choose 0.2-0.3mm.

Laser welding is suitable for thick materials. If aluminum plate is selected, the thickness is generally 0.4mm, resulting in higher material cost. In fact, the two welding technologies have their own advantages. Enterprises should choose the more appropriate welding equipment according to their own actual situation, rather than generally evaluate the advantages and disadvantages of the two welding technologies. At present, the representative manufacturers of ultrasonic welding in China include Wuxing, pengsangpu, Jiuyang and other enterprises.