Laser miniature solders cupreous material technology

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To come true report is contacted and spare parts of join electric conduction is the commonnest solder receive one of application. It pervades almost all industrial application circumstances, be like car, electric with electronic equipment, and medical treatment equipment. Uses join technology need considers cost, weldability integratedly can and crop. Narrow ceaselessly as spare parts dimension and what function asks is progressively rise, all traditional join techniques, solder like crimp, heat and drill rod solder no longer applicable. Under photograph comparing, tack welding is received depending on solder the dot is complete, firm and conductibility can be good wait for an advantage, become necessary standard very quickly to solder technology. The material of first selection is copper, because it can be conducted effectively,energy is mixed transmission signal. Material character of copper makes it suits to serve as conductor very much, but be soldered very hard. In addition, as a result of decrescent of spare parts dimension, contact has been achieved " miniature solders " dimension, such, soldering difficulty is greater. Cupreous miniature solders to balance control to bring enormous challenge to the heat of these small-sized and electric spare partses -- because must want to assure soldering quality, ensure at the same time won't overheat or be heated is insufficient. Manufacturer people whether satisfy these requirements at the same time? Yes, the green laser welder that uses wavelengh to be 532 Nm can come true. Discussing at present all sorts of solder optionally before the technology, we define miniature to solder first: Miniature solders is the joint of two kinds of material, among them the ply of at least one kind of material is less than 0.

02 inches. At present optional technology includes: Ultrasonic solders technology, resistance welding technology and laser beam welding receive a technology. Ultrasonic solders the technology is a kind solder effectively technology, be used to join copperplate and other part; However, this is process of a mechanical connective, the geometrical appearance of characteristic of the mechanical power that it gets part of be confined to, interface, contact, and the appearance combination of different spare parts. Resistance welding technology is a kind of practical technology, but, it gets the limitation of contact appearance, and need is bought small-sized conduct electrode, still need to safeguard. Because ultrasonic solders,with resistance welding two kinds of technologies need to be contacted directly with the spare parts in order to generate contact, total weld time is equal to cycle of apply the brake to increase weld time. To large-scale manufacturing industry, this means many time delay. As contrary as this, laser beam welding receives the treatment process that is contact of a blame, need one-way treatment only. It can machine very small area, solder the spare parts of all sorts of different figure. Fit cupreous stuff very much it seems that it seems that solder, but, here still has a problem. Be in place of wavelengh 1064 Nm, the reflectivity of cupreous material is more than 90% . Accordingly, to overcome the problem with initiative tall reflectivity, need very big power density. Once material of laser bring into contact with, material begins to fuse, reflectivity can drop quickly. Initiative when needs power density is far the power that is more than need of the place when soldering, bring about material overheat to evaporate, in solder point point hole is led exorbitant, perhaps form empty. A lot of different techniques already were used to the problem that overcomes this reflectivity, include pulse plastics, use oxygen to assist, and use the cladding metal with small reflectivity. Laser plastics technology is not very reliable, exist to change certainly because of the reflectivity of copper and other and electric spare parts, the time place that reduces laser power so also needs to have change accordingly. Current, already technical personnel tries to use feedback technology to reckon this time is nodded, but, these experiment and did not succeed. Use oxygen to serve as auxiliary gas, the penetrable rate of the laser in raising line form copper greatly to solder, the coverture on the spare parts that because wait for,solders covered an oxide film. But, this technology does not apply to spot welding to receive, because auxiliary action of oxygen must be in,just can show continuously, such, in single site of short perhaps welding line in soldering, this technology cannot provide reliable result. Use the cladding with lesser reflectivity, for instance nickel or stannum, can reduce initiative reflectivity really, but, it cannot solve a problem completely, because be in the process of laser and cupreous action, still need very big energy to make laser coupling arrives cupreous material. Accordingly, miniature solders but size range of pipe bent is very small. Nextpage is nodded to good, firm laser beam welding is formed to receive in cupreous material surface, locate block good soldering prime cause -- material reflectivity. Turn into from 1064 Nm when wavelengh when 532 Nm, the reflectivity of copper and other data was reduced greatly (see a table 1) . The laser that uses 532 Nm wavelengh makes laser light beam lasts coupling arrives on cupreous material, and was stabilized solder process. Graph 1 gave out to use 1064 Nm and 532 Nm laser the result after the cupreous material to doing not have film undertakes soldering is comparative. Use what go up in cupreous material when 532 Nm laser to solder the effect, can go up in steel material with 1064 Nm laser solder to be rivalled as a result. Solder to undertake miniature successfully, must use wavelengh to be the green laser of 532 Nm. Realize this wavelengh to be able to have two kinds of kind, the commonnest method is to use tone Q laser, but such laser undertakes soldering without enough pulse energy. More new-style technology is to use Nd:YAG pulse laser, the 532 Nm laser that it gets, peak value power is achieved 1.

5 KW, wide 5 Ms of arteries and veins. This was offerred solder enoughly energy, can penetrate ply amounts to the copperplate of 350 micron. Such energy, use in reinforce of most miniature solder in already enough. Use by fiber-optic transmission Nd:YThe brightness that another advantage of AG pulse laser is beam of light is low, this raised anxious stain to manage the rate that draws light, avoided to the center is nodded to form heat spot in solder and produce instability. The numerous electric join in using domain product is in there is very big distinction on its dimension, appearance and material. Accordingly, the function that a few case will come explain 532 Nm laser beam welding is received and advantage gave out here. Semiconductor join pursues 2 in 0 what gave out to solder to go up to plate.

0015 inches of thick aureate copper cash. Because copper cash is transverse wider, but ply is very small, need so undertake soldering with a dimension relative to bigger facula. Below this kind of circumstance, have long arteries and veins wide the energy with can be offerred better with the laser of power of low peak value flows, and the low brightness of beam of light makes compressed copper cash gets heating equably on whole and transverse width. The join laser beam machining of plane and circle end points has high flexibility, when the contact that should machine especially and the geometrical figure of two end are different more advantageous. Graph 3 gave out side direction makes the solder contact between connector and silver-gilt copper cash for rectangular aureate copper. Solder contact is shown " pipe " shape, solder place is formed between the one aspect of the matter of the line and top. The coupling between the circle of laser light beam and copper cash top and copperplate plane makes whole solder the process is very responsible. Same, because the brightness of laser light beam is low, make whole treatment process more the joint that is helpful for a spare parts. The line solders another kind to planar join compose it is to solder sincere is mixed bundle line. When the line is soldered to go up to thin plate, line and bat must undertake absorption to laser energy ceaselessly at the same time, in order to assure the fixity that solder nods (graph 4) . Similar, should solder bundle when the line, must of control line distributing, in order to ensure bundles of whole string is right the absorption of laser. Of frame solder in mass production, if want to solder the different contact on frame, its key solders namely quality and solder speed. Because laser beam welding receives the process that is contact of a blame, it special be helpful for large-scale manufacturing treatment. In conformity after the shift of laser light beam, it can get inside a second many solder are nodded making (see a picture 5) . Between different material when soldering to have different absorptivity when soldering material, the circumstance that often appears is: The material overheat with big absorptivity, bring about material to splatter to perhaps produce hole. Normally, the method that overcomes this problem is the deflection when treatment among them a kind of material. But, to small-sized spare parts, although very tiny absorption also all can be not brought about,solder overheat. If use wavelengh to be the laser of 532 Nm, because the reflectivity of two spare partses is more adjacent, can come true solder the energy balance of the process, rise greatly thereby can solder rate (if pursue 6) . Of material of brief summary copper soldering is a more difficult process, and miniature copper solders make the difficulty of this treatment greater. Laser beam welding receives a be the joint process that realizes cupreous material practical technology, it uses the treatment means that is not contact, very the treatment process that applies to automation. However, the reflectivity that copper is in in 1064 Nm wavelengh is very tall, block up the implementation of laser beam machining. To overcome this difficulty, we use the green Nd:Y of 532 Nm wavelenghAG laser welder, it solders for the large-scale miniature of cupreous material and other conductor the means that provided effective. CNC Milling CNC Machining