[en] Recommendations for toughness testing and evaluation procedures for weldments are given in this paper. For testing aspects, two testing methods are outlined, micro-flat tensile tests and the δ₅ testing technique. The micro-flat tensile tests are extremely useful to measure tensile properties for the Heat Affected Zone (HAZ) of multipass welds and very thin weld regions such as laser beam or electron beam and it is rather universal. It can be applied to any type of test pieces as well as to structural components with surface breaking cracks. These two test methods can provide efficient tools for tensile and fracture testing of metallic materials joined by fusion welding technology including high power beam welding processes. For toughness evaluation aspects, the J estimation procedures for mismatched specimens are reviewed, including a summary of a new proposal for best estimates of the mismatch on the J integral. The new procedure covers not only weld metal cracks but also HAZ cracks. Finally some recommendations are given for further development. (author)

[en] Testing was carried out with the cooperation of Westinghouse Hanford Company and the United States Bureau of Mines at the Pittsburgh Research Center in Pennsylvania under the Memorandum of Agreement 14- 09-0050-3666. Several core drilling equipment items, specifically those which can come in contact with flammable gasses while drilling into some waste tanks, were tested under conditions similar to actual field sampling conditions. Rotary drilling against steel and rock as well as drop testing of several different pieces of equipment in a flammable gas environment were the specific items addressed. The test items completed either caused no ignition of the gas mixture, or, after having hardware changes or drilling parameters modified, produced no ignition in repeat testing

[en] The article confirms a significant growth of the share of automatic modular arc welding equipment in the modern welding practice. A possibility to assemble the required equipment proceeding from a specific production objective of the customer is noted as a primary advantage of modular systems. composition, performance and design features of modular domestic-make complex are considered. 1 ref

[en] Technological procedures and properties are described for alloy type 21Kh15K3FT which is suggested as a material for permanent magnets. The alloy was melted in induction furnace of high-purity charge material and then subjected to forging, hot and cold rolling. To produce meeded magnetic properties the thermomagnetic treatment was applied. It consisted of cooling with given rate within the range of 700 to 600 deg C in c static magnetic field. Extremum value of coercive force may be reached on long-term (10 h) annealing at 500 deg C. It was concluded that alloy type 21Kh15K3FT essentially exceeded ALNICO alloys in residual magnetic induction and magnetic energy

[en] There are plans to install or replace many PWR-steam generators. The welding period must be reduced because of its length. The use of electron beam welding (EBW) can greatly reduce the welding period compared to conventional welding methods (narrow-gap GMAW and SAW). The problem in applying EBW is to improve the toughness of the weld metal. The authors investigated the factors that deteriorate weld metal toughness of EBW and made clear the manufacturing process which utilizes a new secondary refining process and a high-torque mill in actual mass production. The actual fabrication was evaluated and approved by an EBW quality assurance committee including neutral members. As a result, application of EBW to PWR-steam generators has become possible and large amounts of ASTM A533 GrB C12 (JIS SQV2B) steel plates for EBW have come to be produced. The authors evaluated EBW base metal and weld joints including fracture toughness, and also reported on the status of fabricating steam generators

[en] Laser material processing technology has deeply penetrated into various industrial applications since 1966 when the first industrial CO₂ laser was built. Since then the versatility and importance of lasers in material processing has been gaining recognition and acceptance with the result that many industries in the developed countries utilize laser systems. This has encouraged further investigations into the improvement of material processing methods using laser to overcome the presently confronted difficulties. Laser is the versatile tool both for metals and non-metals and as a single heat source it can perform multi functions which is not possible by any other heat source. (author). 71 refs., 32 figs

[en] Maskless patterning of aluminium has been achieved by using visible light from a copper bromide vapor laser for pyrolytic decomposition of trimethylaluminium (TMA) and trimethylamine alane (TMAA). A silicon monocrystalline wafer was used as a substrate. The deposition was carried out at different process parameters (partial pressure of the precursors, laser power and scanning speed). The analysis of the resultant stripes included scanning electron microscopy, Auger electron spectroscopy, Talystep and electrical resistance measurements. The crystalline structure of the layers showed well-defined grains for both precursors. The Auger electron spectra indicated pure aluminium layers with small quantities of oxygen and carbon for stripes deposited from TMAA while those obtained from TMA were more contaminated. The difference in the layers composition for the used precursors resulted in their resistivity values. The low resistivities of aluminium stripes deposited from TMAA (up to 4.0 μΩ.cm) makes it promising precursor for metalization with aluminium and especially for chemical vapor deposition enhanced with pulsed visible laser. (orig.)

[en] Main parameters of continuous casting of steel type 12Kh18N10T have been determined for a horizontal casting machine with two-side withdrawal of castings. The process makes it possible to produce slab billets without trimming and 5to obtain then rolled products which meet the requirements of standards. Horizontal casting machine allows one to reach a good yield higher by 5% compared to that for vertical or radial machines

[en] Mechanical activation of CeO₂-ZrO₂-SiO₂ mixtures was performed in a high energetic vibratory mill with WC lining and grinding media. It was shown that in air atmosphere the reduction of Ce⁴⁺ into Ce³⁺ took place at 1400 C. The Ce³⁺ ion is stable in air in the form of Ce₂(WO₄)₃ contrary to the Ce³⁺ ion in Ce-silicates. (orig.)

[en] Beryllium is a light, rigid, but toxic material, often used in aeronautical, space and military applications. Many assembling methods have been developed to create high strength joints over a wide temperature range. Moreover, specific equipments allow to confine and assemble the beryllium with high accuracy. This know-up can also be used to study new beryllium alloys. (authors)