The laser of aluminous lithium alloy is compound solder

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In aerospace manufacturing industry, the application of new material is increasing, also drove to it corresponding new-style solder methodological development, the laser of aluminous lithium alloy is compound solder is a kind among them. The development trend of material of modern plane construction is: Develop to compare a pattern Gao Bijiang, high energetically, fight corrode, be able to bear or endure of tall, low temperature muti_function structural material, implementation structure is decreased heavy; Improve material and structural preparation technology, reduce production cost and maintain cost. Contemporary airframe material still is given priority to with aluminium alloy, steel dosage tends decrease, titanium alloy dosage increases significantly. Main material has aviation engine alloy of aluminium alloy, titanium, high temperature alloy and composite material of of all kinds high temperature. Aluminous lithium alloy is close come ten years a domain with the most rapid development in aviation metal stuff. Alloy of aluminous lithium of production of industry of brief introduction of aluminous lithium alloy points to the quantity that contain Li ％ of 1 ％ ~3, regard main aggrandizement as elemental aluminium alloy with Li. The destination that Li adds in alloy is the stretch model amount that increases alloy, the density that reduces alloy (density is lower than general aluminium alloy ％ of 5 ％ ~12, stretch model volume is high ％ of 5 ％ ~8) . Lithium alloy has aluminium to be compared low density, high compare stiffness, good microtherm performance, good corrosion resistance intensity, high to be able to be mixed exceed model outstandingly shape function; Its intensity, rupture tenacity, succumb intensity, fatigue function is as temperature reduce and rise; It has exceed plasticity goodly, can make figuration record complex, hard the spare parts of figuration, reduce labor intensity and the weight that reduce a construction. The aluminium alloy that replaces convention with its can make component part quality is reduced 15% , stiffness raises 15%~20% , be considered as the ideal construction material in aerospace industry. In this domain, aluminous lithium alloy oneself aluminium alloy of groovy excel in was replaced on a lot of component. From select material of empty guest A380 distributing in light of (graph 1) , the proportion that aluminium alloy holds is the largest, 61% what amount to airframe construction heft, because this wants to achieve performance improvement, must develop the aluminium alloy material of innovation and engineering technology, specific it is to increase intensity and scathing allowance, reinforce stability and rise fight corrode ability. Empty guest A380 was used 2099, 2199, alloy of 2196 lithium waiting for aluminium. Use at the floor roof beam of A380, if crossbeam, seat slips,mounting frame of equipment of course, cockpit and structure of sea cabin floor, electron reachs horny form content, can decrease weigh hundreds of kilograms. The generation below Russia is narrow system plane MS-21 will use composite material wing and tail surface, and airframe general is made like aluminous lithium alloy by advanced alloy. Graph the material of structural member of A380 of 1 empty guest allocates laser answer to add up to solder technology to receive a technology as laser beam welding the maturity application in industry, laser beam welding receives insufficient place of the technology to also be shown with each passing day. Above all, laser beam welding receives installation cost big, electric efficiency is low (general under 10 ％ , the electric efficiency of the occurrence laser of current and fiber-optic laser just raises 30 ％ to control) ; Be pair of workpiece next solder assemble precision the demand is high, if butt joint clearance, bad side estimates a demand,be less than 0.

1mm or board thick 10 ％ , this needs special clamping apparatus and treatment not only, also bring very great difficulty to actual application; Moreover the plasma that high-power laser beam welding receives a process is right of laser absorb, reflection action, reduce solder stability and the utilization rate that surge light energy, and tall solder speed is brought about solder contact is fast and caky, easy cause stomatic, defect gnawing an edge, welding line organizes brittleness, appear even solder crackle; In addition to tall reflectivity material (aluminium alloy, copper alloy) realize laser beam welding to receive hard. Be aimed at these problems, domestic and international scholar studies in what devote oneself to to raise laser beam welding to receive adaptability all the time, at present the mainest avenue is to use laser - electric arc is compound soldering method. Laser beam welding solders with another kind methodological photograph is united in wedlock solder the technology is called " laser is compound solder (LASER Hybrid Welding) " , among them, stimulate beam of light and electric arc at the same time action at weld zone, interact and action are called " laser - electric arc is compound solder " . Laser solders to be received with arc welding is two kinds of different welder art, carry the mutual influence of laser and electric arc, what can overcome oneself of method of avery kind of is insufficient, produce favorable compound effect then, achieve good integral performance thereby, solder in improvement quality and manufacturing technology sex while, improve efficiency / cost comparing. Stimulate smooth compound welder additionally art the space with still be had better is patient sex, expensive solder speed and excellent mechanical performance, have huge appeal and economic benefits to aviation manufacturing industry consequently. The developed country waits in Germany, Japan, laser - electric arc is compound solder the technology is applied to extensively from thin plate small be out of shape thick board high speed solders, apply to what aluminium alloy reachs heterogeneous material to solder. Laser - electric arc is compound the advantage that soldered to develop laser and arc welding adequately to receive, rose effectively to solder efficiency, shortened welder foreword is periodic; Special it is difficult to wait in aluminium alloy solder in the metal, can decrease in different level, different respect or eliminate weld defects. As a result of the prominent dominant position with economy and practical technology, wide in aerospace manufacturing industry application. The laser of aluminous lithium alloy is compound solder graph 2 it is laser - plasma is compound solder the spot photograph of alloy of 5A90 aluminous lithium, the graph is laser 3 - MIG is compound solder alloy of 5A90 aluminous lithium. Graph 2 laser - plasma is compound solder alloy of 5A90 aluminous lithium pursues 3 laser - MIG is compound solder alloy of 5A90 aluminous lithium uses laser - electric arc is compound solder solders aluminous lithium alloy, can raise frit to be mixed greatly solder speed, relax the clearance limitation of butt joint welding line, the assembly of the workpiece in increasing to solder actually makes rich degree. Because electric arc is right the auxiliary action of laser, still can enhance those who be opposite such aluminous glancing to lead tall metal to solder ability, raise solderability to reach solder stability. Graph 4 it is laser of alloy of 5A90 aluminous lithium - MIG electric arc is compound solder appearance of welding line form. Graph 4 5A90 is aluminous lithium alloy laser - MIG electric arc is compound solder appearance of welding line form uses YAG laser - plasma electric arc is compound solder solders aluminous lithium alloy can make solder rate rises, solder the process is stable, solder mass promotion, tell further, compound brought about efficiency to increase and solder of adaptability increase. CNC Milling