But solder of second birth copper

8 to 1 μ M, glow) or frequency turns over the Nd:Y of timesAG laser (532nm, green light) the light that can provide these wavelengh, although these laser have not reach the level with cupreous feasible industry. In laser radiate bit more incident heat speed depends on the rate that draw, the risk of overheat and splatter form become uncertain. To spot welding, the question with poor reappearance is more more obvious than seam welding. Every laser pulse pounds Lengtong material to be able to experience different initiative condition. However, because absorb,depend on not only wavelengh and exterior feature, still depend on material temperature (when temperature is elevatory, absorb also rise significantly) with laser radiant intensity, make raise welder art still have extra space. The problem with the poor reappearance that in cupreous solder can be being improved significantly on the laser pulse that the laser pulse that enclothes wavelengh of 532nm of two kinds of wavelengh general enclothes wavelengh of 1 μ M, often encounters. If two stimulate beam of light to use identical chromatically to compensate lens to undertake focusing, it can cause cupreous appearance normally from solder positional center heats to the brim. Because green light-wave is long,this is better absorb character, raise cupreous temperature thereby, the absorption that raises two wavelengh finally ability. After absorptivity increases, the difference of exterior feature does not have so big impact. For example, if one stimulates beam of light to be comprised with 85% glow by 15% green light, of two kinds of wavelengh different and initiative absorb ability to also consider inside, about the green of same energy and infra-red radiate can be absorbed (fall in room temperature) . Graph 2 show go up in the sheet copper with 300 μ thick M outside entering Hang Chungong, solder (make an appointment with 1MW/cm2) , pure green light solders (make an appointment with 1MW/cm2) and the result that the combination of two kinds of wavelengh solders. Theoretic, the facula dimension of two kinds of wavelengh is 200 μ M about. When using pure infra-red pulse, did not observe fused cupreous surface, when using pure green pulse, can see a few fused, and when undertaking two kinds of pulse enclothing, can bring about welding line pool to increase apparently. Technology details chooses a proper infra-red pulse form to be able to let relative green smooth share (change efficiency for instance) undertake adjustment. Graph the 3 infra-red pulse forms that showed a pattern and the green changeover that arise from this. Laser pulse can be divided into 3 phase, describe in more detail from the back. The beginning in laser pulse level (0.

5 to 1ms) , with ensuring intensity of intended setting pulse frequency turns over the infra-red radiant scale of times highest. Infra-red will heat with green radiant combination cupreous surface, the absorption till glow capacity is sufficient tall, cupreous surface begins to fuse. In fused phase, typical pulse power cost is in 0.

5 with 2.

Between 0kW, specific data depends on the ply of sheet copper. Once copper begins to fuse, pulse power decreases quickly. Although this is meant,can change very few green light only next, but in fused phase, the absorption of glow is enough tall. Begin from this, will continue to use glow to undertake soldering only (green heft is negligible not plan) . Solder the duration of level depends on the limits of solder contact and deepness. When pulse ends, the time constant ration of use definition will reduce power, produce positive effect to soldering cooling phase thereby, namely its metallurgy and mechanical function (for example hardness) . Nextpage and pure infra-red soldering comparison pursues 4 showed pure infra-red the contrast that solders to be received with red adscititious green laser beam welding. Pulse duration is 1ms about, did not use pulse plastic (rectangular pulse) . The solder contact in the on half part in the graph is to use pulse power for 0.

The infra-red pulse of 8kW forms, and the solder contact of the below half part of the graph is by 1kW infra-red laser is mixed 0.

1kW green laser founds. No less than anticipates in that way, pure infra-red soldering repeatability is very poor, diametical wave motion is shown, can observe solder contact is lost even. And infra-red the repeatability that mixes solder with green laser is close friends more. Did not spot defect. Graph the illustration of 4 showed a series of use pictures the solder contact that the pulse form of 3 descriptions establishs. The solder contact that establishs through using this kind of method looks almost identical. A more meticulous analysis makes clear, solder the diameter of facula changes far under 10% , and came true to base material from cupreous belt 100% complete solder solder fully. For example, this occupies the rigid standard that accords with medical application. Efficiency considers to be in a more thorough investigation and study, pure infra-red, pure green light and intensity of threshold values of melt of compound of two kinds of ray radiation are able to decide and compare. Form 1 summarized the intensity of melt threshold values that is measured. Among them the intensity lowest of pure green ray radiation, frequency changeover is having very big restriction to flow efficiency. But, if use ray radiation to mix,will replace pure infra-red radiate, below identical laser efficiency, melt threshold values is actual admiral halve, promote flow efficiency thereby. Laser of Lasag SLS GX 1500 of industrial application give typical examples matchs technique of stock GreenMix patent. With other industry idea of green smooth laser differs, this one solution uses source of a laser only, this nature reduced investment cost of the system. Two kinds of wavelengh use optical fiber and special treatment head to convey to cupreous material surface. Chart the 2 technical standards that summed up GreenMix laser. Use GreenMix laser can solve a variety of industry application. At present the working limits of this one laser restricts the package in less than of dimension of 300 μ M. Graph 5 summarized this one laser the working limits to different node form. Branch of research and development is devoting oneself to to break through the limitation of limits of this one work, come true to 0.

5mm reachs the treatment of larger size component. In reality, the representative application of this one laser includes: The belt joint in medical application (for example pacemaker) ; Down-lead bond (for example the down-lead casing on carbon fin) and the lead of electronic industry and mobile equipment is detached, the join of component of the solar energy in industry of glazed still bend over (for example flexible solar cell) . Summed up the article to summarize the method that raises laser beam welding to receive cupreous material repeatability significantly. The combination of the infra-red He Luguang of figuration of use intelligence pulse, raised soldering repeatability not only, still increased flow efficiency greatly. CNC Milling CNC Machining