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HF Welder Spare Parts It Is Effective To Improve The Absorption Of The Light Beam

(1) Laser power. There is a HF Welder Spare Parts density threshold in laser welding, which is lower than this value, and the penetration depth is very shallow. The plasma is produced only when the laser power density on the workpiece exceeds the threshold (related to the material), which marks a steady deep weld. If the laser power is lower than this threshold, the workpiece only surface melting, or welding to stabilize heat conduction type. When the laser power density is in the vicinity of the critical condition of the small hole formation, the deep weld and conduction welding alternately, which becomes unstable welding process,HF Welder Spare Parts resulting in a great fluctuation in the deep penetration. Laser power simultaneously controls penetration depth and welding speed during laser deep penetration welding. The weld depth is directly related to the beam power density, and is the function of the incident beam power and the beam focal spot. In general, for a certain diameter laser beam, the penetration depth increases with the increase of the beam power.

(2) Beam focal spot. The beam dot size is one of the most important variables in laser welding because it determines the power density. But for high-power lasers, measurement of it is a problem, although there are already many indirect measurement techniques.

The limit spot size of beam focus diffraction can be calculated according to the optical diffraction theory, but the actual spot is larger than the calculated value because of the aberration of the focusing lens. The simplest measurement method is the contour method, which uses thick paper to scorch and penetrate the polypropylene plate to measure the focal spot and perforation diameter. In this method,HF Welder Spare Parts the time of laser power and beam action can be mastered by measuring practice.

(3) Material absorption value. The absorption of the laser material depends on some important properties of the material, such as absorption rate, reflectivity, thermal conductivity, melting temperature, evaporation temperature, etc., the most important of which is the absorption rate.

The factors that affect the absorption rate of the laser beam include two aspects: first, the resistivity of the material, the absorption rate of the material is proportional to the square root of the resistance coefficient, and the resistance coefficient changes with the temperature. Second, The surface state (or finish) of the material has an important influence on the absorption rate of the beam, which has a significant effect on the welding effect.

The output wavelength of the CO2 laser is usually ten. 6μm, ceramics, glass, rubber, plastic and other non-metallic absorption rate of it at room temperature is very high, and metal materials at room temperature to its absorption is very poor, until the material once melted and even gasification,HF Welder Spare Parts its absorption is increased dramatically. It is very effective to improve the absorption of the light beam by using surface coating or surface-generated oxide film.

(4) Welding speed. The welding speed has a great influence on the penetration depth, and the increasing speed will make the melting depth shallow, but the speed is too low and will lead to the excessive melting of the material and the workpiece welding wear. Therefore, there is a suitable welding speed range for certain materials with a certain laser power and a certain thickness, and the maximum penetration depth can be obtained in the corresponding velocity values.

(5) Protect gas. The laser welding process often uses the inert gas to protect the molten pool, when some material welding does not care about the surface oxidation can also not consider protection, but for most applications are often used helium, argon,HF Welder Spare Parts nitrogen and other gases to protect, so that the workpiece in the welding process from oxidation.