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Laser cutting

Fast reactor fuel assembhes are shrouded with a relatively heavy metal envelope. This envelope is removed before shearing by either laser cutting (14) or stress cracking (15). [Pg.204]

Resistance and arc welding operations, and plasma and laser cutting produce fumes by expulsion or evaporation of the base material, coating, and electrode wear. Larger particles deposit on the surrounding surfaces, while smaller particles move upward with convective flows. Specific contaminants associated with different welding and cutting operations are listed in AWS. ... [Pg.428]

The micro structured platelets, hold in a non-conducting housing, were realized by etching of metal foils and laser cutting techniques [69]. Owing to the small Nemst diffusion layer thickness, fast mass transfer between the electrodes is achievable. The electrode surface area normalized by cell volume amounts to 40 000 m m". This value clearly exceeds the specific surface areas of conventional mono- and bipolar cells of 10-100 m m. ... [Pg.413]

Laser cutting, welding, and hot working leave a discolored oxidized layer or scale on the surface of the worked steel. This must be removed in order to perform many of the surface finishing processes. The acid pickling process is used to remove the oxide or scale of metals and corrosion products, in which acids or acid mixtures are used. [Pg.1192]

Amulyavichus, A., Daugvila, A., Davidonis, R., and Sipavichus, C., Chemical composition of nanostmctured erosion products produced upon laser cutting of steel, Fizika Metallov IMetallovedenie, 85, 84, 1998. [Pg.86]

Injection plug should be 1—2% of total capillary length Re-cut capillary, laser cuts are best. Follow procedure In reference 3... [Pg.56]

In an optical micrograph of a commercially available nitinol stent s surface examined prior to implantation, surface craters can readily be discerned. These large surface defects are on the order of 1 to 10 p.m and are probably formed secondary to surface heating during laser cutting. As mentioned above, these defects link the macro and micro scales because crevices promote electrochemical corrosion as well as mechanical instability, each of which is linked to the other. Once implanted, as the nitinol is stressed and bent, the region around the pits experiences tremendous, disproportionate strain. It is here that the titanium oxide layer can fracture and expose the underlying surface to corrosion (9). [Pg.350]

Coupons should be obtained, suitably prepared, and supplied in a small paper envelope impregnated with a volatile corrosion inhibitor (VCI). Typically they are 3 x x in. thick, with a laser-cut mounting hole. [Pg.383]

A continuous micro structured foil fabricated by wet-chemical etching was unwound from a roll and continuously coated with slurry. If required, the metal foil could be pre-cut to any plate size by laser cutting at defined positions. This would ease later separation of the plates after coating. These etched and laser-cut foils are products already commercially available. First tests were performed with micro structured foils and described in detail in Chapter 4. [Pg.395]

The dimensions of the stainless-steel micro structured reformer are 75 mm x 45 mm x 110 mm. It consists of a stack of micro structured steel foils coated with catalyst and tempered by heating cartridges in the reactor housing. Laser-cut graphite foils were used to seal the reformer under operating conditions up to 200 °C at a flow rate up to 900 ml min-1 and a residence time of 0.07 s. [Pg.563]

Laser cutting of catalyst carrier coated foils... [Pg.627]

Laser cutting tools are commercially available, so there is no need for individual development. The device should be equipped with a two axes-driven laser head and possess the ability to adjust the laser power in order to permit also surface treatment such as laser ablation (Figure 4.110). For a continuous process, also enough space must be supplied for the continuous inlet and outlet of the foil. Further, a means to position the laser head with respect to the foil is necessary. This part of the process has only been tested using individual short foils and was still not integrated in the continuous process. However, continuous laser cutting of foils is a known commercial process and it is expected that the amount of future development in this part of the process will be limited. [Pg.627]

Positioning problems during laser cutting procedure... [Pg.628]

A molecular fluorine excimer laser (157 nm) was also used to ablate PMMA chips to a depth of 500 pm [197], It was also reported that acrylic (or PMMA) plates were processed using a laser-cutting machine [198],... [Pg.31]

Fig. 6. Topological analysis of 2-AG distribution in different layers of rat hippocampus. Selected microstructure from hippocampus was laser-cut under the microscope (A) and analyzed using a state-of-the-art microflow LC/MS system. A heat map was generated to show topological differences in 2-AG levels (B). Fig. 6. Topological analysis of 2-AG distribution in different layers of rat hippocampus. Selected microstructure from hippocampus was laser-cut under the microscope (A) and analyzed using a state-of-the-art microflow LC/MS system. A heat map was generated to show topological differences in 2-AG levels (B).
The module further comprises a flat end surface 124 to which a substrate 126 may be bonded. The substrate is of alumina or sapphire and has disposed thereon a mosaic array 3 of electro-optical detectors 4. The detectors are formed by etching or laser cutting of a mercury cadmium telluride layer which has been deposited on the substrate. Each detector is connected at one end 130 to a common reference terminal 132 and at the other end 136 to terminal 134. The substrate further comprises a pattern of through holes 138 and metal dots 140 such that each signal terminal 134 contacts a dot 140. The substrate 126 is aligned on the end surface 124 such that the metal dots 140 in each hole 138 contacts a conductor 114. As a result, each detector 4 is coupled to a pad 118. [Pg.314]

Laser cutting is a fast growing process. The laser can act as a materials eliminator. Concentrating its energy on a small spot, it literally vaporizes the material in its path. If the workpiece is held stationary, the laser drills a hole. If the piece is moved, it slits the material. The induced heat is so intense and the action of the laser is so fast that only little heating of the adjacent areas of the piece takes place. [Pg.568]


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See also in sourсe #XX -- [ Pg.568 ]

See also in sourсe #XX -- [ Pg.262 ]

See also in sourсe #XX -- [ Pg.496 ]

See also in sourсe #XX -- [ Pg.1118 , Pg.1120 ]




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