Optimize Nd:YAG laser beam welding receives quality to improve treatment efficiency

Make solder the development of craft and optimize minute of a lot of phase, it is above all select material and solder joint design, it is to choose to solder next technology, make solder program, finally is to make the clamping apparatus in the system optimize, data processing and solder engine control. A lot of systems ask to may produce mutual conflict. E.g. , the requirement solders while contact is secured cheek by jowl, ask hand of high speed, low cost uses treatment again, ask to solder quickly already for instance again, ask laser beam welding of low cost, low power comsumption is received again at the same time. We should consider afore-mentioned problems and other in whole project process a variety of elements. Current new product emerges in endlessly, engineering design technology develops at full speed, want to be in incincible position in industry, best method is with as far as possible the flexibility of low cost implementation height and outstanding performance. Introduce below solder in systematic development process, oberg Industries company develops his adequately to come in the professional knowledge that craft and machine domain accumulate and experience for years, collect appliance to have super modulation (Super Modulation) laser system of the function, developed an economy thereby model solder system. Oberg Industries is manufacturer of an accurate stamping workpiece, basically serve to wait for domain of a lot of industry at car, medical treatment and spaceflight aviation, famed with component of high accuracy finished product. The client of domain of a car ever told this company, of the package of some kind of gasbag that another manufacturer offers solder have quality problem. This supplier uses traditional tungsten extremely argon arc solder (TIG) welder art, ensure very hard offer necessary reliability. Oberg used his distinctive professional punch technology to improve the accuracy of package and quality, but the complete and reliable solder that the client still hopes to provide form a complete set take-overs. Then, oberg begins to consider to use laser technology to achieve afore-mentioned goals. Be located in in its in the Sarver workshop near Pittsburgh of Ni Yazhou of guest evening standard, oberg used laser of YAG of pulse of low power comsumption to undertake soldering experimenting. The client of Oberg is mixed in visual exterior to test result the expression of intensity respect feels special satisfaction, but think whole process is too slow still. Accordingly, oberg asks ministry of facilities of GSI group laser to help, see them whether the method that uses lab analysis to raise rate through its. Center of design of engineering of GSI group application depends on his tens of year experience of laser beam machining, can offer the program of high quality, low cost for potential client, so that they are complete,heart body devotes oneself to equipment to create the job. With respect to the requirement of oneself character Oberg need can support second of 50 millimeter ／ one kind not only solder speed, and the laser source that returns demand of strength of can contented final client. Solder take-overs is a ply is about 1.

The screen pipe of fragment of steel of carbon of 1008 belts aperture of 2 millimeter. Before soldering, the stiletto on preexistence flat, let flat form clearance again next about 1.

The canal of 5 millimeter, such facilitating undertake juncture is opposite neat with fixed position. The quality standard of this one craft is to ensure the surface and bottom appearance are good, and although have,exceed big globe to pass screen pipe forcibly, also won't affect solder. Sex of the phase in production process undertakes detecting. Be located in Mixiegen the first job of the lab of GSI group application of city Novi city is to determine the exact laser cause of archetypal component and solder suitably technology. Make after discussing, discover with Oberg, although 1kW is successive Nd:YAG laser can realize every second easily of 50 millimeter solder rate, but such this projects are without economy but character. From estimated for angle, 500W laser is more applicable. Archetypal component succeeds at soldering in July 2006, what its use is to support successive wave (CW) the JK501SM Nd:Y that outputs two kinds with Super ModulatedTMAG laser. Archetypal component solders when the experiment, with taking the solid valve of aperture the component is an object. Appear to achieve different frit and detect its intensity, used those who differ to solder respectively speed and parameter. Super ModulatedTM output can provide power of higher laser peak value with sine wave and square wave weaveform, double what can amount to rated laser power most, still can realize laser sum to decide average power at the same time. Such, solder rate rose 40% , and the quantity of heat that use up was reduced than using CW to output only a lot of. In addition, super ModulationTM still can decrease considerably solder the laser that scattering of place of soot of bath upper part solders in the process can. CW output is soldering the meeting after beginning a few millisecond produces many soot all the time in weld, soot is grain shape, can produce scattering, bring about focus of deviate of beam of light thereby, generation is larger welding line frit is wide reduce frit to appear. When using wave of sine of periodic peak value or square wave weaveform, of super modulation laser before stimulating light energy to be able to achieve certain scattering to affect in soot quantity give out inside a few millisecond. In phase of loop of modulation low energy, soot volume can fall to be close to quickly 0, stimulate output of illuminant repass Super ModulatedTM to begin to issue one job to circulate after that. Without giving thought to laser power volume or quality of beam of light how, can produce this result. The improvement that CW, sine affects the sectional graph clarity of quadrate wave modulation showed frit is appeared circumstance. For this, oberg chose the smoothest 500W CW to solder law, solder speed is every second 50 millimeter, frit is amounted to fully 100% , use the focus camera lens of 100 millimeter, focal diameter is 300m. Put these initiative parts into simple vice, clip arrives aperture is airtight, protection argon gas passes side nozzle eduction. Between 2006, the progress that designs as the component and of production tool roll out, undertook more solders again test. Below all circumstances, component the hand is moved in putting fixed unit, reoccupy vice places his aperture airtight, laser process is very consistent. After laser system arrives at Oberg and the system begins to undertake laser beam welding is received, solder in prototype transition is made for automation solder a few problems appeared in the process. The aperture of butt joint welding line appeared as a result of component position and bounce problem certain abhorrent sex. Make the protective gas below fixed circumstance discharge a design to detect without passing, in addition solder the mechanical test that the component also did not pass a client. Solder appropriately to come true intensity, solder rate falls to every second 23 millimeter. GSI group applies a project to designed a center to undertake checking as a result to soldering, sent relevant staff of engineer and Oberg company to solve craft problem together. As a result they discover, aperture exists in certain and fixed component, and solder positional difference is brought about welding line and central fixed position not the laser beam welding of beautiful is received in energy loss. The focus that heightens focus camera lens can enlarge focus size, can avoid relevant aperture problem thereby. To will solder speed promotes to every second 50 millimeter ensure systematic economy is practical, super ModulationTM of square wave of laser parameter instead. This was accelerated solder speed, and can contented focus size enlarges the requirement of 20% . Solder enoughly to come true intensity and toughness, must optimize solder the protection argon gas that fixed equipment gives is discharged, ensure process is medium extremely as low as the quantity containing oxygen in the solder in cooling process. It is implementation finally every second of 50 millimeter solder speed, can use square wave super modulation technology, frequency is 300Hz, 900W of peak value power, focus size is 360um, give protection argon to enrage side by side. The Super ModulationTM technology that uses average power to be 500W makes the system can make up for project prototype to develop the aperture difference problem that level predicts hard, the synchronism of YAG laser technology that still can pass moderate of low cost, power comsumption at the same time designs component and technology. After successful implementation craft is designed, of Oberg solder the component achieved place to need strength, and power comsumption is compared beforehand of appraise low still. Last through using the 500W that has super modulation function undee laser, oberg realized essential speed requirement with low cost not only, and still can ensure workmanship solders mediumly speed and quality, solve problem of all craft tolerance. Through using this system, estimate Oberg but section yo-yo the mechanical cost of 100 thousand dollar. Oberg is very satisfactory to afore-mentioned results, this conduces to not only gain new business chance, and still can make it rolls out brand-new workmanship for new old client. CNC Milling