Since 1960, US scientists Mesmin developed the first ruby laser, along with the world economy and science and technology leap in laser technology has made rapid development, it has been widely used in various industries for the transformation of traditional industries and manufacturing modern industry to provide advanced technology and equipment. After the laser processing technology into the jewelry industry, with its speed, accuracy and convenience and popularity, has been more widely used, it has become an indispensable jewelry business equipment.
Laser welding advantages
Laser welding has the characteristics of high welding strength and speed, low rejection rate, is widely used in modern manufacturing. In jewelry manufacturing, compared with conventional welding techniques, laser welding has obvious advantages.
1. High speed, high intensity, small deformation, orthopedic and clean up after welding.
The biggest reason for jewelry manufacturing enterprises widely used laser welding technology is its speed and welding deformation is small, does not need orthopedic and clean up after welding. Although faster than traditional laser welding welding flame, but the operation is usually handheld or agents jig member, you can only weld one. Since most jewelry laser welding studio is not large enough to handle a lot of work, so that the welding time will be increased slightly. However, after welding, due to reduced clean-up work, the time saved enough to compensate for the welding time. Laser welding can be carried out under the protection of an inert gas, it will not leave a bright spot in the product, and therefore no need to add a co-solvent welding, after welding also need pickling process. In general, the higher productivity of laser welding.
2. Suitable for precise welding, to ensure the quality of the workpiece.
Since the laser beam spot is small and can be obtained gather precise positioning, suitable for high-volume automated production, not only playing to improve production efficiency, and a small heat-affected zone, pollution-free solder joints, which greatly improve the welding quality and reduce Rejection rate. Such as electroplating Au mass fraction of 58%, Ag content of 2% 14K alloy jewelry, flame welding, Ag produce annealing, the overall hardness of the jewelry from Hv = 145 is reduced by about half, if you fall to the ground from a height of the waist will fell out dents. The use of low-power, high-speed laser welding, since the heat is concentrated, the workpiece is not annealed occur, and thus will not affect the strength of the workpiece.
3. The assembly of high precision, contribute to the development of new jewelry manufacturing process.
Since the jewelry industry refers to laser welding technology, it changed the traditional way of jewelry design thinking. By means of laser welding technology, we can make some special structure of jewelry styles. In the past, due to the limitations of traditional welding technology, these ornaments special structures difficult to complete or fail to meet quality requirements. Laser welding in a very narrow area, the easier the alloy material of different types of welded together, therefore, between two components of the color or tissue can be mutated, not mixed with each other. Narrow laser welding work area to make it in wettability, connect the grain size soundness and heat affected zones do not have conventional welding techniques.
4. Consistency and stability. Usually without filler metal and flux, it can make the work of local melting soldered directly.
5. Simplify the work of repair work, such as repairing and clearing near gem metal castings holes, etc.; also from the more complex welding, heat-sensitive components 0.2mm parts, such as hinges, hooks, fasteners, inserts vent.
6. Do not pollute the environment. In the laser welding, without using a solder with a solvent, or need to use chemical solvents to clean the workpiece, and therefore, there is no problem of waste disposal.
7. The metallic material can be saved. When using conventional welding techniques, the general needs of the metal thickness 0.2mm; and the use of laser welding, it can be thinned to 0.1mm, and thus reduce the weight of the ornaments of 35% to 40%, which electroforming technology products is particularly important. Laser welding the noble metal can not only save material, but also saves the solder, and soldering the multiple is not necessary to use different types of solder.
Features:
Low power jewelry manufacturing conventional laser welding machine, the most maximum security, compact, easy to move the structural characteristics, the operator can sit comfortably next to the machine operator. A typical jewelry laser welding machines quickly, reliably and accurately weld most metals and alloys, but its effectiveness depends largely on the performance of the target material. Continuous casting can be set up or repair one or more laser pulses done under visual control, usually a pulse duration 1 ~ 20ms. A stereo microscope and cross lines welded part can be accurately positioned, within the field of fine-tuning the position of the workpiece. Work environment is usually atmospheric air, if the air or inert gas is injected into the workspace to a cooling effect, an inert gas may also improve the quality of welding alloys
Alloy material effect on the laser welding
Different alloys which different effect laser welding. Under the same control parameters and the same laser welding machine heat transfer pulses each welding condition, since the surface of the alloy material absorbs heat energy ratio (ratio of thermal energy instead of reflecting) different, resulting in different effects buy melting pulse. Specific factors include heat from room temperature to the melting point, melting point, melting latent heat and thermal conductivity. Different materials have different thermal conductivity, melting temperature and latent heat of crystallization, these factors together, and it will have a significant impact on the effective welding energy required, only the surface to absorb enough heat to weld.
