Contents of the Paton Welding Journal
no.5, 2008 |
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Page |
| SCIENTIFIC AND TECHNICAL |
Makhnenko V.I., Velikoivanenko E.A. and Olejnik O.I. Risk analysis as a method for formalising decision making on unscheduled repair of welded structures | 2 |
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The ideology of formalising decision making on the scope and terms of repair of welded structures by using their technical diagnostics data is considered. It is based on prediction of the probability of failure due to detected defects for a forthcoming period of operation, and is combined with the advanced risk analysis tools developed in allied activity fields. |
Poznyakov V.D. Improvement of delayed cracking resistance of welded joints of cast hardenable steels | 7 |
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Results of evaluation of delayed fracture resistance of the HAZ metal in welded joints on cast steel of 35L type depending on weld saturation with diffusible hydrogen, welding heat input and preheating temperature, are given. Data on the influence of welding technique on formation of the stressed state of rigidly fixed joints of heavy metal sections are presented. |
Ryabtsev I.I. Calculation-experimental evaluation of the efficiency of alloying the high-alloy deposited metal with phosphorus | 13 |
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The probability of formation of phosphides of some alloying elements (V, Mo, Cr, Mn, Co, W, Al, Fe, Ni, Si) was determined by using thermodynamic calculations. As shown by examinations of microstructure of metal deposited with flux-cored wires, which contain phosphorus, vanadium and phosphorus, molybdenum and phosphorus, and titanium and phosphorus, all of the above alloying elements lead to spheroidisation of phosphide inclusions, which makes promising the use of phosphorus as an alloying element for high-alloy surfacing consumables. |
Kuzmin S.V., Chuvichilov V.A. and Lysak V.I. Peculiarities of plastic deformation of near-weld zone metal in explosion welding according to scheme of double-sided symmetrical cladding | 18 |
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Results of analysis of strain-time conditions in formation of joints and plastic deformation of the near-contact metal layers in explosion welding of metal according to different collision schemes are presented. |
Tsybulkin G.A. Correction of a manipulation robot motion path taking into account additional measurements | 22 |
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The paper deals with issues associated with ensuring the required accuracy of robot motion along paths, the spatial position of which is not known exactly beforehand. The law of corrective control has been formulated, which is based on utilization of additional measurements during the motion, and which guarantees the preset movement accuracy. Modeling of the dynamics of a system realizing this law has been performed. |
| INDUSTRIAL |
Garf E.F. and Snisarenko V.V. Development and application of tubular welded structures | 25 |
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Development and application of welded structures made from tubes is inseparably linked to improvement of welding as technological process for material joining, and involves fulfillment of requirements for assurance of quality and strength of the welded joints. It is shown that Ukraine has many-year traditions in the field of fabrication of tubular structures, and that it has preserved its scientific and industrial potential for further development of this field. |
Kozulin S.M., Lychko I.I. and Podyma G.S. Electroslag surfacing of rotating kiln gear shaft teeth | 31 |
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Described is the experience of application of electroslag surfacing for repair of manufacturing defects in teeth of sub-rim gear shaft of a rotating kiln. |
Zagornikov V.I. Procedure for repair of blades of titanium alloy VT3-1 by electron beam welding | 35 |
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Procedure for repair of complex-configuration titanium blades 1--2 mm thick in the welded joint location by using EBW is considered. The software program was developed for achieving the high-efficiency welding parameters (with speed of up to 50 mm/s) to provide quality weld metal. Refusal from heat treatment outside the welding vacuum chamber to provide the required quality of the titanium blades repaired by EBW is substantiated. |
Levchenko O.G. and Levchuk V.K. Safe level of electromagnetic field intensity in resistance welding | 38 |
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Sources and shapes of signals of the magnetic fields, generated by resistance welding equipment, have been analyzed to perform their reliable hygienic evaluation in line with new standards of Ukraine. Results of investigations of spectral composition and intensity of the magnetic fields, generated using different resistance welding methods, are presented. Recommendations for protection of welders against magnetic fields are suggested. |
| BRIEF INFORMATION |
Dobrushin L.D., Petushkov V.G. and Bryzgalin A.G. Application of explosion energy for treatment of welded joints on decomposers and mixers at the Nikolaev Alumina Plant | 47 |
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Example is given of the efficient application of explosion energy for improving reliability of process equipment installed at the Nikolaev Alumina Plant by relieving residual welding stresses in welds on decomposers and mixers with a diameter of up to 14 m and height of up to 34 m. |
News | 48 |
| NEWS |
To 80th anniversary of Prof. Boris A. Movchan | 48 |
Developed at PWI | 12
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