Contents of the Paton Welding Journal
no.2, 2008 |
| Page |
| SCIENTIFIC AND TECHNICAL |
Makhnenko V.I. and Milenin A.S. Analysis of risk of hot crack formation in braze-welded titanium-aluminium joints on basis of mathematical modeling | 2 |
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On basis of the results of mathematical modeling of heat deformation processes in laser braze-welding of titanium-aluminium joints analysis of risk of hot crack formation in aluminium part of permanent joints has been carried out. |
Yushchenko K.A., Zadery B.A., Zvyagintseva A.V., Kotenko S.S. , Polishchuk E.P., Savchenko V.S., Gakh I.S. and Karasevskaya O.P. Sensitivity to cracking and structural changes in EBW of single crystals of heat-resistant nickel alloys | 6 |
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Transverse cracks in the weld metal were found to be the main defects of the EB-welded joints in single crystals of heat-resistant nickel alloys. Sensitivity to formation of such cracks in EBW of single-crystal nickel superalloy JS-26 depends, primarily, upon the welding speed, preheating and structural state of the initial metal. A probable cause of cracking of the weld metal is its structural heterogeneity, which results from peculiarities of the thermal-deformation cycle of welding, as well as from the initial structural state of metal. The range of the welding speeds, where the cracks are not formed, was determined. Increase in the welding speed leads to growth of the quantity of the cracks, and preheating shifts the critical welding speed towards higher values. |
Poznyakov V.D. Mechanical properties of weld metal and cold cracking resistance of tee-joints on 13KhGMRB steel | 14 |
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Effect of deposited metal composition on mechanical properties of single-pass fillet welds in T-joints on high-strength alloyed steel 13KhGMRB and resistance of these joints to delayed fracture depending upon hydrogen concentration, welding heat input and shielding atmosphere composition have been evaluated. It is shown that the highest resistance of such joints to cold cracking is observed in CO2 welding using 1.6Ä2.0 mm low-alloy wire Sv-08G2S, with preheating to 60 °C and limited diffusible hydrogen content (up to 3.5 ml/100 g) of the welds. |
Kasatkin O.G. Reversible temper brittleness of welded joints of WWER reactor bodies | 19 |
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Reversible temper brittleness caused by an increased concentration of diffusible impurities, and phoshporus in particular, is the main reason of accelerated embrittlement of welded joints of a nuclear reactor body in the initial period of operation. Radiation defects of crystalline lattice caused by the neutron flux act as high-energy traps and decrease the concentration of the diffusible impurities. Increase in the fluence of fast neutrons leads to growth of the density of the crystalline lattice defects, which promote decrease in the concentration of impurities at grain boundaries, as well as decrease in temper brittleness. |
| INDUSTRIAL |
Pismenny A.S., Novikova D.P., Yukhimenko R.V., Prokofiev A.S., Pismenny A.A., Polukhin V.V. and Polukhin Vl.V. Technology peculiarities of high-frequency seam braze-welding of pipes | 22 |
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Methodologies for investigating braze-welding processes of longitudinal pipe seams by the method of resistance heating and heating of the edges being connected by flowing along them electric current are presented. Results of metallographic investigations of pipe welds produced by mentioned methods are presented. |
Lobanov L.M., Timoshenko A.N., Goncharov P.V. and Zajtsev V.I. Technology of spot arc welding of three-layer steel panel with cellular filler | 26 |
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Considered are the features of arc spot welding application in manufacture of a three-layer panel with cellular filler of high-alloyed steel. A possibility is demonstrated of process implementation with one-sided access to the item and under constricted conditions without application of considerable forces for compression of the structural elements being joined, as well as at joining thin-walled metal 0.1Ä1.0 mm thick in the gravity position without a packing. |
Khaskin V.Yu. State-of-the-art and prospects of development of laser technologies for deposition of coatings and surface hardening (Review) | 29 |
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Development of commercial technologies for laser hardening and coating is considered on the basis of the published data beginning from the 1980s up to now. The situation in this field in the CIS countries and Ukraine is analysed. Promising research areas in this fields are indicated. |
Korzh V.N. and Popil Yu.S. Adjustment of thermal power of hydrogen-oxygen flame at flame treatment | 35 |
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The effect of composition and character of flow of a combustible mixture on variation in thermal power of the flame is considered when using the hydrogen-oxygen flame formed as a result of combustion of a mixture produced by water-electrolysis generators. Thermal power of the flame produced in combustion of a pure hydrogen-oxygen mixture and mixture with additions of hydrocarbon compounds has been determined. |
| BRIEF INFORMATION |
Zhernosekov A.M. Influence of network voltage fluctuation on process of pulsed arc welding | 38 |
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Influence of reduction of the power supply network voltage on sputtering and characteristics of the deposited metal in the consumable electrode gas-shielded pulsed arc welding of carbon steels is experimentally determined. It is shown that at mentioned disturbance it is efficient to use the two-channel automatic stabilization system. |
Thesis for scientific degree | 40 |
News | 40 |
| NEWS |
The First International Conference «Joining Aluminium Structures" | 42 |
Developed at PWI | 21
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