Welding flux of titanium alloy active solders technology

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Titanium alloy material with its good mechanical performance, corrosion resistance can and density is small wait for an advantage more and more apply at the industry such as aviation, spaceflight, oil, chemical industry and ship vessel widely. The titanium alloy that solder of arc of tungsten pole argon is a large number of application in afore-mentioned each industries solders structure most often use solder one of methods. This method has craft abundant to spend adaptability of big, craft quality of strong, welding line is good wait for a characteristic, but also put in density of electric arc energy the poorer, heat when soldering inputs inferior, penetrable ability bigger, big to the fire damage of material, welding stress is out of shape bigger wait for inadequacy; Solder in titanium alloy especially when, easy generation enrages the blemish such as aperture, immediate impact solders the performance characteristics of component part. Current, the development of new-style plane solders to titanium alloy the demand of structural member is higher and higher, be badly in need of developing new-style, high grade, efficient solder method, with engine of contented and advanced aviation, plane efficient, high-powered the requirement that the structure that reachs high reliability designs macrobian to advanced production technology life, low cost. Tungsten of active welding flux extremely argon arc solder (A-TIG) the technology gets used to this one requirement namely and development rises. This technology can solve afore-mentioned groovy TIG to solder not only the technology of existence is insufficient, and fall in same craft condition, can raise component part solder quality and service life [1-3] , it is technology of solder of arc of tungsten pole argon to develop new applied perspective. Titanium alloy A-TIG solders ability and characteristic A-TIG solder the technology is before soldering, be in wait for solder welding flux of active of layer of Tu Yi of the surface on workpiece, have the technique of TIG solder along welding flux layer next. With groovy TIG welder art photograph is compared, titanium alloy A-TIG solders the penetrable ability of electric arc increases significantly, hot input quantity, solder be out of shape reach stress to reduce. Soldering when the product component of identical norms, soldering identically below voltaic condition, can not come true to groove sheet path solders or make v number of plies decreases apparently, improve yield of solder deliver a child and product quality thereby, twice reduces cost. Additional, the blemish of welding line stoma that active welding flux can reduce the generation in process of argon arc solder greatly, improve directly thereby solder contact and solder fatigue function of the structure. The experiment makes clear, the fatigue limit of connect of butt joint of solder of A-TIG of TC4 titanium alloy rises than groovy TIG solder 16% , 90% what can reach mother capable person. At present technology of solder of arc of argon of welding flux of titanium alloy active has developed become a kind to improve quality to assure weaponry, raise treatment efficiency and the new-style and advanced join that reduce cost to make a technology. Titanium alloy A-TIG solders technical fundamental is put filmily in what restricted electric arc to guide sectional, make electric arc contractive thereby; Next, enclothe layer of active welding flux as a result of surface of material of alloy of the titanium before soldering, guide in electric arc in passing Cheng, only electric arc heat mixes active welding flux first titanium metal melt, realize liquid state titanium to squeeze the success of welding flux film, the success that just can achieve electric arc guides connect and stabilize combustion. Because there is better wellability between the active welding flux of melt and liquid state titanium, accordingly, welding flux film is squeezed not easily again. What its are squeezed is less, welding line is narrower also, the heat flow of electric arc also jumps over concentration, the depth that frit shows is deeper; The 3rd, when A-TIG solders, vapour of element of active welding flux enters electric arc atmosphere, increased the thermal conductivity of the plasma in arc column, make electric arc contractive thereby; The 4th, electric arc heat makes active welding flux decomposes ionization to enter airspace of electric arc periphery, welding flux ion captures electron of electric arc periphery forms anion, reduced the tension of space of arc column periphery, make electric arc contractive thereby. As a result of the synergism of a few afore-mentioned respects, make A-TIG solders electric arc solders to produce apparent systole in the process, arc column current density increases, cause solder frit is deep increase. Welding flux of active of existing state of affairs of foreign technology development is first most solder by Wukelanbadu the institute comes out at 60 time development. Its original development intent is to pass in welding line the area adds halide in order to improve the stomatic problem in the welding line when solder of titanium alloy TIG. Test result makes clear, while additive halide is restraining stoma of titanium alloy welding line, still affected the figuration of welding line: Below the circumstance that is equal in other condition, welding line frit is deep (H) increase, frit is wide (B) reduce, coefficient of welding line appearance (ψ =b/h) also reduce accordingly. In addition, the heat when soldering is inputted (Q/V) also reduce accordingly. In view of a series of positive results that add halide place to bring, cling to place developed product of the first kind of multivariate and active welding flux 1964 -- AHT-9A, use at titanium alloy to solder. Current, craft of its A-TIG solder already passed an experiment to affirm, use at the domain such as establishment of report of facilities of Russia aviation, spaceflight, chemical industry, pressure vessel, power, nucleus. The United States uses the research respect of active welding flux to compare Wukelan to lag behind relatively in argon arc solder. But the stainless steel that at present the United States already used development to go out and solder of arc of carbolic steel argon undertake container of catamaran housing, tanker, nuclear reaction, pressure vessel wait with active welding flux build; Naval respect is using this welding flux to solder ship vessel and submarine use pipeline system and certain component. Institute of Beijing aviation production project solders to titanium alloy A-TIG the technology had thorough research, set out from the point of view that emphasizes application, developed the product of active welding flux that applies to solder of arc of titanium alloy argon, applied for to the country invents patent and obtain authorization. The institute solders to A-TIG craft undertook the system studies, from soldering pre-treatment craft, solder the heat treatment after standard, solder and solder the respect such as the function of contact and groovy TIG solder undertook comparative detailed contrast, the stable craft parameter that got A-TIG of material of alloy of commonly used titanium solders, began A-TIG to solder on this foundation technical project uses research. With Shenyang aircraft industry (group) limited company cooperates, be aimed at TA15 and butt joint of flat of material of BT20 titanium alloy and penetrable solder form of two kinds of connect, in leader plant manufacturing site began contrast of TIG solder and A-TIG solder craft, model to fill solder craft contrast and intensity of the connect after filling solder and fatigue performance are comparative, got a series of relevant foundation data, provided a basis to coach effectively be produced related the factory. On this foundation, the FT-01 of welding flux of titanium alloy active that institute of Beijing aviation production project already still will develop and success of A-TIG solder technology apply at some spaceflight large titanium alloy solders structure, some model is moire celiac board bridge solders the structure solder in research, performance of gotten welding line connect is superior, reduced amount of welding line stoma effectively, reduced solder be out of shape, product integral performance is superior, quality is reliable. Active welding flux solders the technology receives medium applied Beijing aviation to made project institute still undertake laser beam welding of active welding flux accepts technology research and applied research in laser beam welding, finished welder art experiment and solder contact function checks an experiment. Test result makes clear: Active welding flux can improve titanium alloy laser beam welding effectively to accept medium blemish gnawing an edge, rise solder the fatigue function of contact. Current, laser beam welding of active welding flux applies successfully already in the batch production of structure of some model plane. CNC Milling