The solder of laser drill rod in medical apparatus and instruments

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As a result of nickel titanium (NiTi) , platinic (Pt) and stainless steel (the material such as SS) has unique character, join heterogeneous material is equipment of advanced medical treatment continues consequently developing a crucial question. The requirement that joins special biology photograph contains material may result from the special anticorrosion performance that remembers alloy to produce distinctive function to perhaps maintain Pt and SS contact at the same time to reduce cost through using the figure such as NiTi and SS. To satisfy these requirements, developing a kind of new laser join technology at present, form in order to be between metal of look of look of two kinds of heterogeneous biology autogenous (without stuff stuff) contact. From body laser join craft aux will be able to is not had quite seam join these component and need not use special adhesive and fill data. Because hot influence area is small and spot size is small, the main join mechanism of the component of the metal in joining craft has made the medical treatment equipment such as pacemaker that is based on laser. Compare with photograph of traditional heat source, the account that because the hot sensitivity of component reachs his to continue,miniature changes, laser the advantage in join craft (heat up influence area for example most Xiaohe is controlled provide energy) very important to workmanship of medical treatment equipment. But, the new look that joint of special type metal is formed normally complications, strength is caused inside contact for instance low ahead of schedule the brittleness between the metal of invalidation. Although great majority is based on the join craft of laser to use laser,input the base material of direct and fused connect or stuff stuff from solder of body laser drill rod, but, because use contact interface,the heat of place accumulates advantage, the joint that from body laser the design of join craft forms considerably the spot dimension under laser light beam. Facing special metal interface to have the technology of this kind of join of scanning is to use laser irradiation among them a kind of base material. Choose the laser parameter such as power and rate, make be not exceeded its by the balance temperature of the component of illuminate fused temperature. Because the heat of interfacial heat-resisting generation accumulates,bring about temperature to rise prep above the fused temperature of a kind of base material, form fused layer when laser light beam is adjacent consequently. When arriving at an interface, laser light beam is shut, in the contact photograph adjacent cools when, fuse the layer is quenched, form from body copper solder kind contact. The sketch map of craft of this kind of join refers to a graph 1. Aim from craft of solder of body laser drill rod the oldest rate reduces two kinds of material mix, because small, temper by dipping in water leads fused bulk at top speed tall and local and fused solder the one aspect of the matter of contact in order to reduce the brittleness between the metal. Another advantage is in local caloric to fall to fuse with likeness temperature joins at can mixing the least state of affairs two kinds of material. Graph the 2 temperature curves that showed the scanning of laser light beam that faces tinsel and tinsel interface heats up a model. Because quantity of heat accumulates, when laser light beam arrives at an interface, observe temperature increases. The NiTi that diameter of experimental setting choice parts to be 380 µm and 368 µm about and tinsel of 316L stainless steel undertake soldering experiment. These two kinds of material use NiTi and SS in medical treatment equipment to be paid close attention to particularly by everybody: Stainless steel cost is low and already evaluated a test through biology consistence, niTi is had exceed strong flexibility and appearance memory character. Before join, the axis along perpendicular tinsel grinds the one aspect of the matter every tinsel to make the same score and assemble fixture to go up. In the successive wave Nd:Y with 1064 Nm wavelenghDuring AG laser illuminate, use axial force secures the burnish surface of sample together. Control gauss laser spot as same as wire diameter size. Adjust laser power highest 4.

75 tile, part scanning rate and scanning distance at the same time adjust in 0.

1 millimeter of 2 – / second and 1 – 2.

Between 5 millimeter. Laziness is enraged in the freeboard purity argon that flows into fixture undertake laser joins in the environment. Appearance of welding line geometry pursues 3 revealed use the typical contact that receives craft to form from body laser beam welding. Tell on whole, contact surface is very clean, without the clear evidence of occurrence hole or crackle. Did not discover tinsel is large-scale be out of shape, during making clear treatment, base material did not appear to fuse considerably. Graph 4 be along Y-Z plane the optical micrograph that tastes likewise after transverse section. Observe clean interface hole few or without hole, without crackle, without evidence of interfacial connection half-baked. Contact itself faces tinsel center the narrowest, along coping and bottom surface wider. Nextpage composition analysis is in what NiTi-SS interface carries out to quantify chart of ray of energy dispersion X with different deepness in illuminate surface (EDS) the curve refers to 5c of graph 5a –. The join area between composition of metal of two kinds of base material displayed the mixture between Fe, Cr, Ni and Ti. This limits of mixture area indicated the breadth of contact. This kind of specific sample shows contact width limits is about between 5 – 25 µm. Appearance makes clear different composition curve to solder differently the mechanism holds dominant along the different area of contact. The fused layer ply that faces laser illuminate surface is bigger, show fused duration is longer, can enter dilute of more stainless steel fused NiTi. Observe the fusion of two kinds of data that face tinsel center is the smallest, fuse layer ply can be reduced considerably. The composition curve of this area is similar to diffusion control craft, but superstratum is similar to be based on fused join mechanism. Graph 5 still indicate contact breadth considerably the dimension of focusing of beam of light under 400µm, because this affirms the mechanism that contact forms is not laser light beam,fuse directly, the quantity of heat that needs however accumulates. Graph 6a and 6b showed use the joint that forms from craft of solder of body laser drill rod to rupture composition graph of the surface, among them gules, green and blue represent Fe, Ni and Ti respectively. Two rupture the surface basically is green and blue, the extent that demonstrates to Ni and Ti are contained a lot ofinside contact appears rupture. The surface is certainly in contact and the ration of composition measures quantity general to rupture is not some is planted in material. The extent that basically shows red states SS tinsel joins not complete or rupture. Observe not complete join of the interface with constant power scanning rate is function. When laser scanning rate increases, enter the integral energy of tinsel to reduce, because this has the effect that reduce fused layer thickness or removes fused layer, cause those who enclothe whole interface is fused inadequate. Contact intensity is heterogeneous the ideal connect intensity between material is to exceed inferior base material intensity. After producing great plasticity to be out of shape, stainless steel tinsel arises about of 280 Mpa bring to bear on laden, rupture when load is close to 560 Mpa. Sample of NiTi super flexibility appears at first flexibility is out of shape, till stress level reachs phase of the metal when 470 Mpa,change martensite from austenite. After laden stability, observe appear another linear and stretch area, bring to bear on stress is adjacent 1.

5Observe when Gpa rupture. Graph 7 show use the model that joins from body laser craft joins observe through the electron microscope when sample to rupture the surface. Exterior configuration states accurate dissension ruptures, as above, believe to rupture be in contact and appearing is not base material in. To low scanning rate (highest 1 millimeter / second) experiment, highest connect intensity is achieved about 275 MPa. Although this strength is great,approximate stainless steel succumb stress, but, did not observe before rupturing in stainless steel tinsel can feel plasticity to be out of shape. The higher rate that begins recently and power (8 watt-hour are as high as 2 millimeter / second) the experiment has shown fracture stress exceeds 470 MPa. People believes to raise scanning rate to be able to make quantity of heat more local change and accumulate, with lesser fused pool is being formed in shorter duration, because this brings about base material between mix reduce and be formed between the metal and evolution process decreases. The article investigated conclusion the facial expression of photograph of two kinds of biology that laser of new link craft is using at medical treatment equipment to apply from solder of body drill rod is formed between material NiTi and stainless steel 316L without seam head. The intensity of stainless steel base material is adjacent during contact shows tensile test succumb stress, rupture exterior existence allows dissension to rupture. Experimental result shows recently rupture intensity adds prep above stainless steel further succumb the degree of stress. The EDS graph of cross section indicates contact breadth considerably under diameter of incident laser light beam, because quantity of heat accumulates,make clear and form fused pool. Achieved contact intensity makes clear, laser from solder of body drill rod it is to form NiTi and stainless steel photograph of these two kinds of biology contains heterogeneous material between one kind of firm connect feasible the method with foreground light, need not use fill data, can apply to other extensively very quickly in stuff of didymous and heterogeneous metal. CNC Milling CNC Machining