Resistance welding technology plays body to process medium application in empty empty missile
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source:BACHTEL CNC Machining
Resistor spot welding and rolling solder is assemble weldment lap joint, and impaction is in two electrode or between two gyro wheel, connect with electric current, the resistor that uses electric current to shed classics weldment interface and generation of adjacent area place is hot will be fused by solder metal, one kind when form solder dot or welding line below the pressure of electrode or gyro wheel solders method. Its are the biggest the characteristic is the illuminate that does not have electric arc arc, fused metal is by wrap up among metal of mother capable person, prevented outside airy pollution, reason solders the quality of contact is higher. And the time that it heats is short, concentration of quantity of heat, hot influence area is small, arise scarcely solder be out of shape, can assure taller dimension precision, special suit to build the link that accepts a structure at Bao Bi. Resistance welding need not be filled when solder add fill metal, in be not had any soldering by surface of inside and outside of solder spare parts raised, can overcome solder of electron beam solder, arc of automatic pulse argon to wait advanced solder the weakness with methodological insuperable place. Because this resistor spot welding reachs technology rolling solder to be in the high-tech industry domain such as aviation, spaceflight,received wide application, and be in this kind of technology also was used of advanced empty empty missile in great quantities in playing system to build. Resistor rolls solder technology to be in cabin body kind empty missile plays the applied sky in spare parts treatment the cabin body of body kind the spare parts is general by before composition of the connect after cylinder of contact, housing is mixed, they are a whole through join of 2 circumferential welding line. Assemble to facilitate, assure dimension precision, before, hind structure of the butt joint end the lock was used between contact and housing cylinder. When using solder of automatic argon arc to solder, not only solder be out of shape big, circularity and axial dimension precision achieve a requirement not easily, and as a result of before, hind thermal capacitance differs between contact and housing cylinder bigger, when the place end the lock regular meeting arises not solder shows defect. Housing cylinder a side meets what occurrence graph shows 1 times cave inside hot influence area, to overcome this kind of limitation need is designed complex inside support clamping apparatus, solder hind is corrective more difficult also. It is better to use resistor to roll solder method the ground solved these problems, not only dimension precision is taller, and the requirement that welding line quality also reached level of I of spaceflight ministerial standard. As a result of cabin body kind the spare parts is a kind of cylinder mostly model solder structural member, the accessibility of gyro wheel is poorer, solder to make gyro wheel can undertake to cabin system interior deep, particularly right equipment undertook transforming, special design made next gyro wheel arm and next gyro wheel, be aimed at the characteristic of cabin system structure, the two side that playing gyro wheel added insulation unit, working surface the design is become spherical. Because issue diameter of gyro wheel arm to reduce, the arm is long increase, rigid and insufficient, bending may arise to be out of shape below the function that gyro wheel pressure is attending when soldering and make go up, amlposition of next gyro wheel slippage, affect soldering quality thereby, the broaden when be being designed so the working face of next gyro wheel. To prevent welding line loose, and be when metallic refrigeration is contractive can continue to bring to bear on gyro wheel pressure, this task uses a pace to rolled solder technology to assure to solder into type resistor quality. Technology of resistor spot welding is in engine housing kind the uses engine housing main composition part in spare parts treatment is cylindrical shell and reinforcement, its solder combination is shown 2 times like the graph. Among them 4 reinforcement are machine treatment, cylindrical shell is Bao Bixuan casting die, it leans puissant come back pressure, grind exhibit make, cold make sclerotic appearance more serious, existence has greater internal stress, extremely easy generation solders be out of shape, cylindrical shell solders quality asks for class of I of spaceflight ministerial standard, and arrive to avoid an effect the following assemble, the requirement is inside cylindrical shell the surface not be patient of any soldering raised. Accordingly, control solders be out of shape, assure to solder quality, and avoid inside tall or exterior beyond is other of any forms raised it is engine housing solder the main technique difficult problem that place should solve. For this, this task group used 3 kinds of methods to undertake soldering experimenting. Because solder of arc of 1 manual argon wants to press the welding line that 8 parallel solder on cylindrical shell in Bao Bixuan, what cause solder be out of shape quite big, although use paragraph of add,solder is mixed inside support clamping apparatus, the circularity of engine housing also from beginning to end short of designs a requirement. Because use handiwork to solder fillet weld, quality is controlled not easily. Can produce incomplete fusion and root ministry when voltaic hour not solder shows defect; Can arise in the surface inside cylindrical shell when electric current is big raised, have a bit inadvertent, cylindrical shell has the risk that is burned to wear even by solder leakage, because this solders this kind,the method is experimenting level with respect to disuse. Nextpage2 electron beam solder by the graph 2 knowable, arise to make the surface inside cylindrical shell is not sent raised, 8 strengthen costal region welding line to ask to receive blame penetrability welding line to build. The electron beam when soldering should be crossed strengthen costal region, the fused deepness on cylindrical shell wants control to be in cylindrical shell wall is large 80% the left and right sides, the welding line that face of have a common boundary manages should have enough breadth. Area of the welding line width that is in because of face of have a common boundary is too small join is insufficient, short of welding line bears the weight of the requirement of force, the welding line that wants to make face of have a common boundary is in has certain breadth, cylindrical shell has be appeared by solder, solder leaks and cause the hazard that discard as useless. Use solder when parameter will control electron beam to be not appearance of cross section of penetrability welding line, solder craft parameter masters not easily, the closes level to strengthening costal region and cylindrical shell to stick requirement before solder also is quite strict, and solder by blame penetrability the blemish problem that causes (for example slag inclusion, stoma) bad also to solve, final this kind solders the method is paid no attention to because of the carrying capacity of welding line want and cost is higher and be abandoned. 3 resistor spot welding should solder the method overcame solder of manual argon arc and electron beam solder solder be out of shape reach greatly bear the weight of can / the defect with not high power. The joint that strengthens costal region and cylindrical shell relies on electrode pressure to come true. Nod the effect that quality causes to solder to overcome electrode slippage, solder nowadays electrode diameter is more than electrify pole diameter and electrode head is designed spherical, can make the surface inside cylindrical shell produces any impress scarcely so. Resistor spot welding joins not only area greatly prep above electron beam the welding line area of solder, the dimension precision such as carrying capacity and circularity accords with design requirement completely also, and its cost tall, quality stabilizes low, efficiency, because this uses the method of resistor spot welding finally. Resistor spot welding is in with technology rolling solder face of helm, ala kind the application in spare parts treatment is inchoate face of the helm of empty empty missile, ala is sincere structure. Be measured to reduce weight and raise range, to be being mixed remotely the empty empty missile of over-distance Cheng used relatively advanced envelope framework structure commonly now. Stitch welding or resistor are used to roll solder join between envelope and envelope, spot welding is used between envelope and framework (3) seeing a picture. By the graph 3 knowable, the spot welding structure of face of helm, ala belongs to double dot to be built hollowly accept structure of oblique plane spot welding, solder difficulty is greater. Needing overcome technical difficult problem is the electrode head with the slippage that solves electrode to go up in oblique plane spare parts and special design, in case exterior impress is local too deep. Solder to conduct electric current and the tigidity that add a part, make the spare parts is not sent below the pressure of electrode happen be out of shape, in hollow place a place of strategic importance adds cupreous qualitative space block when the experiment. To the welding line of periphery of face of helm, ala, to rise efficiency is mixed assure to solder the consistency of quality, the experiment used resistor to roll solder method. As a result of divide evenly fast the issue that gyro wheel pressure cannot hold when nucleus of frit of existence rolling solder is caky, the pace still was used to roll solder technology into type when the experiment. Technology of resistor spot welding solders to use contemporary air mediumly in functional sex spare parts empty missile plays system structure quite complex, outside removing main body part, still have many thread, nut, reinforcement, scaleboard, fixed wait for functional sex spare parts to need spot welding playing body to go up. Some cabin body, a weldment reachs hundreds solder point. Form of connect of spot welding of resistor of functional sex spare parts is what the graph shows 4 times to wait for spot welding of overlay of ply double deck commonly, differ spot welding of overlay of ply double deck and wait for spot welding of ply three-layer overlay. The joint degree that soldering main problem is a spare parts is bad to reach build receive the solder drop that too narrow place causes the area to splatter, frit nucleus is loose wait for difficulty. Functional sex spare parts is heat shapes mostly, dimension precision is not tall, and arm of long and thin electrode and different electrode must be used again when soldering, use electrode pressure to let its well joint is more difficult. The structure as a result of the interior that bomb put oneself in another's position is quite compact, the spare parts is built receive an area insufficient, the electrode when soldering too stand by the brim, because of this meeting generation splatters, cause frit nucleus loose. Settlement way is to choose match spare parts, proper increase electrode to decide solder chooses the place pressure, accurately, use elliptic electrode first class, reach the frit nucleus area that the interface manages in order to ensure. Last word resistance welding is relatively mature solder technology, because its solder,be out of shape small, in be not had any soldering by surface of inside and outside of solder spare parts raised, special in applying to Bao Bi to build those who accept a structure to solder to wait for a characteristic and play the treatment of body in empty empty missile, get applied extensively. The way that sides with long-range, high speed, high accuracy, tall maneuverability and high reliability as empty empty missile develops, the structure that its bomb put oneself in another's position will more and more complex, the compositive part that plays body to go up also will increasing, all sorts of contact forms that implement hard will appear in succession, to resistance welding the technology also will raise taller requirement. As a result of empty empty missile play body length, diameter small, electrode or gyro wheel need to arrive deep cylindrical shell is in-house, accessibility is poorer, because this needs design appropriative lays electrode arm, design different electrode and special gyro wheel to wait even sometimes. We need to further ground studies and be explored, in order to meet new challenge. CNC MillingCNC Machining