High Power Laser Welding

Welding with High-power Lasers

Technical features:

Laser welding can use continuous and pulsed energy output methods. According to the difference in energy density, laser welding is divided into two modes: laser thermal conduction welding and laser deep penetration welding. Generally, the laser energy density is less than 10^4~10^5 W/cm2 for thermal conduction welding. The incident energy density of the laser is low, and the energy absorbed by the workpiece is not enough to vaporize the metal and only melt. At this time, the melting of the metal is through The absorption of laser radiation and the conduction of heat. Since there is no steam pressure, the penetration depth during thermal conduction welding is generally shallow. When the laser energy density is greater than 10^5~10^7 W/cm2, it is deep penetration welding. The laser of this energy density level can vaporize the metal in the heating zone in a very short time, thereby forming a small hole in the liquid molten pool. Call it a keyhole. The light beam can enter the keyhole directly, and through the heat transfer of the keyhole, a larger welding penetration depth can be obtained. Compared with traditional arc welding methods, the characteristics of laser welding are:

• High energy density, large weld aspect ratio

• Small welding distortion

• Fast welding speed and high efficiency

• Accurately adjustable energy

• A wide range of materials can be welded, and dissimilar materials can also be welded

• The beam can be customized according to needs

Technical advantages:

• Laser-arc hybrid welding: high-efficiency welding of medium and thick plates

• Swing beam welding: difficult-to-weld materials, welding of dissimilar materials

• Low vacuum laser welding: high quality and efficient welding

• Low-deformation welding of multi-weld components: automatic recognition and planning of complex welding paths

• Process monitoring: real-time monitoring of molten pool shape, temperature, reflected light, automatic tracking of welds

• Material: steel, nickel, titanium, aluminum, dissimilar materials, etc.

Industry application:

1. Coal machinery:
It can replace the traditional arc welding method for high-efficiency and low-deformation welding of medium and thick wall parts, such as the welding of the cylinder piston section of the hydraulic support, the welding of the body member of the hydraulic support, and the welding of the scraper.

2. Lifting machinery:
The use of laser-arc composite heat source welding and laser multi-layer filler wire welding technology for high-efficiency and low-deformation automatic welding of medium and thick wall components can partially replace traditional gas shielded welding, submerged arc welding and other methods, such as the welding of crane boom components.