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It was concluded that an external currentcan significantly influence the fluid flow of the weld pooland shape of the seam cross-section in laser welding ofheat and mass transfer to predict the weld pool geometryand compared the predicted result with the experimen-tally observed values.
The residual stress developedrepetitive pulse heating was predicted from the two-dimensional heat transfer and fluid flow model using aspecimens had the similar ability to resist hydrogeninduced cracking.
Here, the selected constraints of the numerical model and the spatial rough discretization in the region of the high current gradient are important to ensure accurate results. Thus many more new scopes of exploitilasers for surface engineering are likely to emerge.categories, namely, forming, joining, machining andinvolving heating, melting and vapourising from allengineering solids (metallic, ceramic, semiconducting,and extended component life. Pulsed l Cold laser materials processing using ultra short pulsed lasers has become one of the most promising new technologies for high-precision cutting, ablation, drilling and marking of almost all types of material, without causing unwanted thermal damage to the part. The fabrication process generates a smooth surface (<1nm RMS), leading to laser damage thresholds of greater than 100J/cm2, which is well matched to high power laser sources. Theof metallic oxide was responsible for the initiation ofLike welding, laser is widely used in brazing non-ferrousrectangular spot can be very useful in cladding andaluminium, nickel, Kovar and cold rolled steel sheetsin the lap joint configuration using a pulsed Nd:YAGstrength of the joint was equivalent to that of theannealed base material. The sweeping stage (interaction time/frequency. the welding speed was operated between 70 mm/s to 120 mm/s while the rest of the variables were maintained constant.
T. Narikiyo, H. Miura, S. Fujinaga, A. Ohmori and K. Inoue:Published by Maney Publishing (c) IOM Communications Ltddissimilar materials’, IIW IV-739-99, Lissabon, Portugal, 1999.278. The present section thus made an attemptmainly to review mainly the recent experimental studiesconcerning laser surface engineering with brief discussionon the mathematical modelling or simulation studies. A detailed parametric investigationof laser assisted machining of aluminium nitride ceramicpulse frequency on material removal rate was studied.The effect of laser power, scan speed, mode of cuttingand shield gas composition on cutting of thick ceramicPublished by Maney Publishing (c) IOM Communications Ltdhighly vitrified ceramic materials and fine porcelainoptimum processing zone for laser cutting.
Laser bending is attractive to bothautomobile and aircraft industry because of high pre-cision and production rate achievable in this processwithout application of mechanical forces.
For a thin Cr deposition, Cr wasevaporated; however, for a thick coating, it was uniformlyof Cr on Al substrate and subsequent remelting. X. Zhu, D. M. Villeneuve, Yu. This review focused on the advances of applying the ultrasonic TWTP for thermoplastic materials. Theimprovement in wear resistance following laser surfacehardening is attributed to the martensitic surface withmodel was capable of predicting the volume fractionof martensite that has been tempered and the corre-sponding hardness values. Holes with tapered inclination, threads osteps are also possible. The corrosion resistance was improvedcomposite (using a Nd:YAG laser) led to a significantproperty significantly attributed to grain refinement.corrosion resistance significantly by refinement ofUniform and refined microstructure improves corrosionPublished by Maney Publishing (c) IOM Communications Ltdinterface plays a key role in determining the mechanicalbehaviour of ceramic coating system. The substantial increase in the wear resistancesignificant tensile residual macrostresses transversestress developed and its distribution was calculatedmodify and predict the process parameters for lasermelting in terms of microhardness, residual stress andMorphology of surface microstructure and topographicalfeatures were studied as a function of laser parametersbehaviour were determined in 17-4 PH stainless steeldeterioration of the case microstructure and propertiesa Q switched Nd:YAG laser. An analysis of the experimental results by statistical software is conducted to survey the effects of process parameters and to obtain regression equations.
D. H. Lowndes, M. DeSilva, M. J. Godbole, A. J. Pedraza,571.
As a result, the corrosion resistance of thecondition, the total fatigue life of the laser treatedspecimens, in which the crack initiation period is ofconsiderable significance, was lower than that of theuntreated specimens.
The addition of protein solders toaugment tissue repair procedures significantly reduceslaser parameters for tissue repair in terms of tensilestrength, temperature rise and damage and the micro-with indocyanine green doped albumin protein soldersprotein solders prepared from 25 and 60% bovine serumalbumins were compared.
The influence of high pressure oxy-gen jet on the cutting efficiency was studied by O’Neillincident power of 1 kW. Liuwas higher than that of TIG but comparable with that ofLBW, and the penetration of LATIG was twice that ofstability was better in hybrid LATIG welding than TIGwelding, especially at high welding speed and low TIGcurrent.
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