Laser beam welding receives car bumper

Graph 1, solder remotely system (A) , scanning system (the fiber-optic transmission laser with B) more traditional to using photograph / for robot system, those who use laser of CO2 of equipment high power and scanning head is long-range solder system (RWS) the cycle time that increased to solder. Because CO2 laser solders remotely,the system exceeds 800mm to the focal length of beam of light between workpiece, complete likelihood is reduced solder cycle time, the lens shift speed that the reason is scanning system can exceed 700 meters / minute (see a picture 1) . And, the sensor of RWS can be measured automatically and the focal length between workpiece, make change and the examination solders mode and fixed position data become handy. However, after using RWS, the application that protects gas became an issue -- stimulate beam of light in CO2 normally protective gas must be used when power exceeds 3kW, and system of applied protection air becomes very difficult. Accordingly, in the research of a near future, undertake to armor plate of 800Mpa class high strenth RWS solders, we have observation to affecting solder bead appearance and penetrable factor, decide to whether use protective gas accordingly thereby. The still those produce an effect to car component intensity parameter that is studied likewise. Study best state is among this research, will undertake SPFC 780 1.

Of the armor plate of 2mm ply solder. Adoption laser power is in 3 ～ 4.

8kW, floating rate is 2.

4, 2.

8 with 3.

2 meters / minute, with observation fused area is in have / plasma suffers to affect rate below the circumstance that does not have protective gas. The seam welding of generation grows 22mm, helium air velocity of flow is 25 litres / minute. If the graph is shown 2 times, this kind of gas is transmitted by aperture of jet of a loop. Graph 2, protect gas (helium) with 20 ° dip by the area of infuse 50mm. Applied power is higher, fused area jumps over difficult figuration, this be decided by protects gas at whether existing. Because do not use the process when protecting gas to become not stable, of energy of taller beam of light penetrable fewer also. Interesting phenomenon is to solder width is met as solder to increase and increase of speed, penetrable rate rises. Watch 1 showed have / use below the circumstance that does not have protective gas 4.

The solder that 8kW laser gets bead appearance and penetrable rate case. Graph 3, have / below the circumstance that enrages without protection, penetrable rate and solder the change of width. In this process, RWS photograph gets more easily than the laser system of other sort environmental influence, because CO2 laser has long focal distance, the area that gives because of this every part computation needs to pass observation in order to obtain the accurate data of fused appearance (see a picture 4) . When undertaking an analysis to every part, the penetrable rate of whole process and solder width existence is different. Accordingly, we discover protection to gas is led to penetrating and solder width can produce an effect, the reason is the effect that it can have to stabilize flow. Graph 4, fore-and-aft and sectional (A) , transverse and sectional (B) .

Working state: 3.

6kW, 2.

8 meters / minute, without protective gas.

Overall for, observed stress peak value is in 2.

8 meters / minute, besides a few exceptional circumstances; Our conclusion is to repeat solder brought stress does not have too big connection between penetrable rate together. Because lower solder speed, can achieve better penetrable result normally. Stress load won't be mixed possibly directly penetrable solder width concerns into scale (see a picture 5) . To get more accurate data, need solders to and rather than of fused area area width undertakes comparative. The profit that stress load place brings is soldering at can increasing width. Nextpage pursues 5, although the relation between stress load and fused area area does not have protection to enrage experience to cause the appreciably that stress load is worth to lift, but protective gas is in 4.

Of 8kW soldering is in the process must. Below this circumstance, unless use protective gas, otherwise this process will become not stable, penetrable value also is met too low (see a picture 6) . The RWS that describes here solders craft begins to be used at soldering from 2006 car bumper (see a picture 7) . Normally bumper is to use arc welding of resistor spot welding, CO2 or cold metal to transfer solder will finish. Because it reduced cycle time,choosing laser is, reduced cost of material, raised stress load cost. We plan to study RWS processes medium application in other car component. Graph 6, RWS solders what the setting makes we can find high speed to produce bumper place to need is optimal solder condition. Solder remotely of the system solder the spot (A) , solder the solder of the result bead vertical,reach sectional (B) , car bumper (C) . Study conclusion studies through this, we can get a few verdict. Above all, protective gas is more than to power of beam of light 4.

The bumper of 8kW solders is indispensable for craft. Below the circumstance that lacks protective gas, this craft can become not stable, can appear solder bead blemish. Should be opposite armor plate (SPFC 780 1.

2t) when undertaking folding solder, fused appearance is in different and sectional each are not identical. Accordingly, to get more reliable data, computation fuses area area is very be necessary. Mention besides above these, when middling speed solders, stress load value is very tall normally. So penetrable rate won't affect the quality that is in to jackknife. And when should using protection to enrage, the welder that high power stimulates beam of light art extraordinary stability. Because this arrives to penetrate the effect is mixed completely to get,stabilize solder quality, protective gas is very crucial. Graph 7, begin from 2006, solder remotely the system is used at soldering car bumper. Article author M.

J.

Song (Dkfltm3@naver.

Com) , b.

H.

Jung (Jeongbh@swhitech.

Co.

Kr) with M.

Y.

Lee (Mylee@swhitech.

Co.

Kr) the technical institute that comes from company of Sungwoo Hitech of Korea boiler hill; J.

Suh (Jsuh@kimm.

Re.

Kr) come from Korea machinery and material academy. Using A Remote Welding System (RWS) With A High-power CO2 Laser And Scanner Increases Welding Cycle Time Over Using A More Conventional Fiber-delivered Laser / Robot System.

Because The CO2 Laser RWS Has A Beam Focal Length In Excess Of 800 Mm From The Workpiece, it Is Possible To Reduce The Welding Cycle Time Because The Mirrors Of The Scanner System Allow Positioning Speeds In Excess Of 700 M/min.

Also, the RWS Has A Sensor To Automatically Measure Focal Length From The Workpiece, making It Easy To Change And Check Welding Patterns And Positioning Data.

However, with A RWS, there Is No Provision For Applying Shielding Gas, which Is Normally Required When CO2 Laser Beam Powers Exceed 3 KW, and Implementation Of Such A Shield Gas System Becomes Difficult.

So, in A Recent Study, 800-Mpa Class High-tensile Steel Sheets Were Welded By RWS To Observe The Factors Influencing Bead Shape And Penetration In Response To Using Or Not Using Shielding Gas.

Also Studied Were The Parameters That Have An Effect On Tensile Load On Auto Components.

CNC Milling