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Thermal processing of pipelines welding joints on the route and in factory conditions

UDK: 621.78:621.791.05
DOI: 10.24887/0028-2448-2018-9-134-137
Key words: postweld heat treatment, weld, steel construction, pipelines, welding, tube, local heat-treatment
Authors: D.A. Neganov (The Pipeline Transport Institute LLC, RF, Moscow), N.G. Goncharov (The Pipeline Transport Institute LLC, RF, Moscow), A.A. Yushin (The Pipeline Transport Institute LLC, RF, Moscow), O.I. Kolesnikov (The Pipeline Transport Institute LLC, RF, Moscow)

The technology of heat treatment of steel as a set of operations of heating, holding and cooling of steel products in order to obtain a given level of properties due to changes in the internal structure and texture has long been known. The determining factors that affect the properties of metals are the holding time in the heated state and the cooling rate. However, in the field of pipeline construction, heat treatment technology has been actively used only since the middle of the last century, when they began to use local heat treatment and subjected to thermal effects only part of the design, where it is necessary to optimize the properties, in particular, welded joint. Local heat treatment makes it possible to obtain the required mechanical properties in certain areas of metal structures. Basically, heat treatment optimizes the parameters of hardness, strength, viscosity and plasticity. During the construction of pipelines by means of thermal effects on the weld joint reduce the level of residual welding stresses and contribute to their more uniform distribution along the perimeter of the joint, improve the structure of the metal in the weld areas, and when performing repair work by heating the repair zone reduce the content of diffusion and residual hydrogen in the metal. The reduction of hydrogen in the metal increases the weldability of steel, especially when welding is performed at low temperatures.

The article presents various technologies of heat treatment of steel structures, both on the track and in the factory. The requirements to the equipment, quality control and organization of works at heat treatment are considered, classification of control operations at various stages of works is presented, perspective variants of work are offered.

References

1. Anokhov A.E., Korol'kov P.M., Svarka i termicheskaya obrabotka korpusnogo energeticheskogo oborudovaniya pri remonte (Welding and heat treatment of hull power equipment during repair) Kiev: Ekotekhnologiya Publ., 2003, 88 p.

2. Korol'kov P.M., Khanapetov M.V., Sovremennye metody termicheskoy obrabotki svarnykh soedineniy (Modern methods of heat treatment of welded joints), Moscow: Vysshaya shkola Publ., 1987, 112 p.

3. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy truboprovodov i apparatov, rabotayushchikh pod davleniem (Thermal treatment of welded joints of pipelines and apparatus operating under pressure), Moscow: Stroyizdat Publ., 1987, 233 p.

4. Khromchenko F.A., Korol'kov P.M., Tekhnologiya i oborudovanie dlya termicheskoy obrabotki svarnykh soedineniy (Technology and equipment for heat treatment of welded joints), Moscow: Energoatomizdat Publ., 1987, 198 p.

5. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy (Heat treatment of welded joints), Kiev: Ekotekhnologiya Publ., 2003, 122 p.

6. Blanter M.E., Fazovye prevrashcheniya pri termicheskoy obrabotki stali (Phase transformations during heat treatment of steel), Moscow: Metallurgizdat Publ., 1962, 268 p.

7. Lysak L.I., Nikulin B.I., Fizicheskie osnovy termicheskoy obrabotki stali (Physical basis of heat treatment of steel), Kiev: Tekhnika Publ., 1975, 304 p.

8. Khimiko-termicheskaya obrabotka metallov i splavov (Chemical heat treatment of metals and alloys): edited by Lyakhovich L.S., Moscow: Metallurgiya publ., 1981, 424 p.

9. Khromchenko F.A., Spravochnik po svarochnym rabotam (Welding works guide), Moscow: Publ. of NPO OBT, 1998, 430 p.

10. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy (Heat treatment of welded joints), Kiev: Ekotekhnologiya Publ., 2002, 112 p.

11. Khismatulin E.R., Korol'kov P.M., Livshits V.I. et al., Sosudy i truboprovody vysokogo davleniya (Vessels and high pressure pipelines), Moscow: Mashinostroenie Publ., 1990, 384 p.

12. Nikolaev G.A., Vinokurov V.A., Svarnye konstruktsii. Raschet i proektirovanie (Welded constructions. Calculation and design): edited by Nikolaev G.A., Moscow: Vysshaya shkola Publ., 1990, 446 p.

13. Goncharov N.G., Kolesnikov O.I., Vorontsov A.N., Heat treatment of pipeline welding joints in conditions of the route and plant (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2013, no. 2 (10), pp. 55–59.

14. Goncharov N.G., Kolesnikov O.I., Yushin A.A., Filippov O.I., Study of the impact of low ambient temperatures on welding technology and properties of welded joints of main pipelines (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2016, no. 1 (21), pp. 62–67.

15. Shoter P.I., Neganov D.A., Studenov E.P., Nesterov G.V., Development and approval of national standard "Trunk oil and oil product pipeline transport. Welded steel pipes. Technical specifications" (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation,2015, no. 4 (20), pp. 113–119.

The technology of heat treatment of steel as a set of operations of heating, holding and cooling of steel products in order to obtain a given level of properties due to changes in the internal structure and texture has long been known. The determining factors that affect the properties of metals are the holding time in the heated state and the cooling rate. However, in the field of pipeline construction, heat treatment technology has been actively used only since the middle of the last century, when they began to use local heat treatment and subjected to thermal effects only part of the design, where it is necessary to optimize the properties, in particular, welded joint. Local heat treatment makes it possible to obtain the required mechanical properties in certain areas of metal structures. Basically, heat treatment optimizes the parameters of hardness, strength, viscosity and plasticity. During the construction of pipelines by means of thermal effects on the weld joint reduce the level of residual welding stresses and contribute to their more uniform distribution along the perimeter of the joint, improve the structure of the metal in the weld areas, and when performing repair work by heating the repair zone reduce the content of diffusion and residual hydrogen in the metal. The reduction of hydrogen in the metal increases the weldability of steel, especially when welding is performed at low temperatures.

The article presents various technologies of heat treatment of steel structures, both on the track and in the factory. The requirements to the equipment, quality control and organization of works at heat treatment are considered, classification of control operations at various stages of works is presented, perspective variants of work are offered.

References

1. Anokhov A.E., Korol'kov P.M., Svarka i termicheskaya obrabotka korpusnogo energeticheskogo oborudovaniya pri remonte (Welding and heat treatment of hull power equipment during repair) Kiev: Ekotekhnologiya Publ., 2003, 88 p.

2. Korol'kov P.M., Khanapetov M.V., Sovremennye metody termicheskoy obrabotki svarnykh soedineniy (Modern methods of heat treatment of welded joints), Moscow: Vysshaya shkola Publ., 1987, 112 p.

3. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy truboprovodov i apparatov, rabotayushchikh pod davleniem (Thermal treatment of welded joints of pipelines and apparatus operating under pressure), Moscow: Stroyizdat Publ., 1987, 233 p.

4. Khromchenko F.A., Korol'kov P.M., Tekhnologiya i oborudovanie dlya termicheskoy obrabotki svarnykh soedineniy (Technology and equipment for heat treatment of welded joints), Moscow: Energoatomizdat Publ., 1987, 198 p.

5. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy (Heat treatment of welded joints), Kiev: Ekotekhnologiya Publ., 2003, 122 p.

6. Blanter M.E., Fazovye prevrashcheniya pri termicheskoy obrabotki stali (Phase transformations during heat treatment of steel), Moscow: Metallurgizdat Publ., 1962, 268 p.

7. Lysak L.I., Nikulin B.I., Fizicheskie osnovy termicheskoy obrabotki stali (Physical basis of heat treatment of steel), Kiev: Tekhnika Publ., 1975, 304 p.

8. Khimiko-termicheskaya obrabotka metallov i splavov (Chemical heat treatment of metals and alloys): edited by Lyakhovich L.S., Moscow: Metallurgiya publ., 1981, 424 p.

9. Khromchenko F.A., Spravochnik po svarochnym rabotam (Welding works guide), Moscow: Publ. of NPO OBT, 1998, 430 p.

10. Korol'kov P.M., Termicheskaya obrabotka svarnykh soedineniy (Heat treatment of welded joints), Kiev: Ekotekhnologiya Publ., 2002, 112 p.

11. Khismatulin E.R., Korol'kov P.M., Livshits V.I. et al., Sosudy i truboprovody vysokogo davleniya (Vessels and high pressure pipelines), Moscow: Mashinostroenie Publ., 1990, 384 p.

12. Nikolaev G.A., Vinokurov V.A., Svarnye konstruktsii. Raschet i proektirovanie (Welded constructions. Calculation and design): edited by Nikolaev G.A., Moscow: Vysshaya shkola Publ., 1990, 446 p.

13. Goncharov N.G., Kolesnikov O.I., Vorontsov A.N., Heat treatment of pipeline welding joints in conditions of the route and plant (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2013, no. 2 (10), pp. 55–59.

14. Goncharov N.G., Kolesnikov O.I., Yushin A.A., Filippov O.I., Study of the impact of low ambient temperatures on welding technology and properties of welded joints of main pipelines (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2016, no. 1 (21), pp. 62–67.

15. Shoter P.I., Neganov D.A., Studenov E.P., Nesterov G.V., Development and approval of national standard "Trunk oil and oil product pipeline transport. Welded steel pipes. Technical specifications" (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation,2015, no. 4 (20), pp. 113–119.


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