CN104404216A - Local heat treatment technology for welding cylindrical shell - Google Patents

Local heat treatment technology for welding cylindrical shell Download PDF

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Publication number
CN104404216A
CN104404216A CN201410596682.7A CN201410596682A CN104404216A CN 104404216 A CN104404216 A CN 104404216A CN 201410596682 A CN201410596682 A CN 201410596682A CN 104404216 A CN104404216 A CN 104404216A
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CN
China
Prior art keywords
sides
temperature
electric heating
weld seam
heat
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Pending
Application number
CN201410596682.7A
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Chinese (zh)
Inventor
高宏鸣
朱超兵
张涛
罗永飞
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Dongfang Boiler Group Co Ltd
Original Assignee
Dongfang Boiler Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfang Boiler Group Co Ltd filed Critical Dongfang Boiler Group Co Ltd
Priority to CN201410596682.7A priority Critical patent/CN104404216A/en
Publication of CN104404216A publication Critical patent/CN104404216A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00Process control or regulation for heat treatments

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a local heat treatment technology for welding a cylindrical shell. The technology comprises the following steps: 1, determining the area to be heated with melt lines at two sides of a welding seam as boundaries; 2, calculating the required quantity of electric heating plates according to the external diameter of the cylindrical shell, the area to be heated, the specification of the electric heating plates, the power and thermal equilibrium; 3, respectively arranging the required quantity of the electric heating plates on the external surface of the cylindrical shell at two sides of the welding seam, respectively arranging temperature control thermocouples at two sides of the welding seam according to a temperature difference between the two sides of the welding seam, and connecting the electric heating plates and the temperature control thermocouples at two sides of the welding seam with respective controllers; 4, bundling all the electric heating plates and an area with the edge of 100nm or more with a heat insulation material; and 5, electrifying the electric heating plates to heat workpieces, and detecting the temperatures of the workpieces at two sides of the welding seam through the temperature control thermocouples to make the work temperatures at two sides of the welding seam reach respective preset temperatures. The technology can realizes convenient subarea temperature control, and meets the needs of different heat treatment temperatures at two sides of the welding seam in order to guarantee the product quality.

Description

For welding the localized heat treatment process of cylindrical shell
Technical field
The present invention relates to a kind of localized heat treatment process of the dissimilar steel butt weld for heat-treating by comparatively high temps steel grade.
Background technology
The hyperbaric heating interchanger used in boiler accessory machinery, in this equipment, superheater shell ring adopts Cr-Mo steel in a large number, and tube sheet is the modified forging of Mn-Mo, Mn-Mo-Nb, and shell is Q345R material, shell ring and tube sheet, there is circumferential weld docking in shell, thermal treatment is needed after these two circular seam weldings, due to Cr-Mo steel and their postweld heat treatment temperature contrasts excessive, zero lap is interval, if this circumferential weld conveniently means is heat-treated after welding, thermal treatment temp must according to higher execution, this will cause Mn-Mo, Mn-Mo-Nb forging quality adjustment condition changes, Q345R strength degradation, tube sheet and shell performance cannot ensure, if thermal treatment temp is according to lower execution, do not meet standard-required again, therefore existing thermal treatment process cannot be applicable to this type of unlike material, the welding cylindrical shell in thermal treatment temp zero lap district, quality product cannot ensure.
Summary of the invention
For the technical problem of above-mentioned existence, the invention provides a kind of localized heat treatment process for welding cylindrical shell, it can realize subregion temperature control easily, meets the needs of weld seam both sides different heat treatment temperature simultaneously, thus ensures quality product.
In order to achieve the above object, the localized heat treatment process for welding cylindrical shell of the present invention, is characterized in that comprising the following steps: 1) with weld seam both sides welded bonds for the region that need heat is determined on border; 2) electric heating sheets quantity needed for cylindrical shell external diameter, the region that need heat, electric heating sheets specification, power and heat calculation, makes electric heating sheets power can meet the heat energy needs of heating region; 3) barrel outer surface in weld seam both sides arranges the electric heating sheets of desired number respectively, different according to weld seam both sides Heating temperature, arranges temperature-control heat couple respectively, be connected by the electric heating sheets of weld seam both sides with temperature-control heat couple with respective controller in its both sides; 4) and its edge outer at all electric heating sheets is not less than 100mm range areas wrapping lagging material; 5) electric heating sheets is energized with heated parts, and the temperature of weld seam both sides workpiece is detected by temperature-control heat couple, make the preset temp that the workpiece temperature of weld seam both sides reaches respective, subregion temperature control easily can be realized, meet the needs of weld seam both sides different heat treatment temperature simultaneously, thus ensure quality product;
Preferred as one of the present invention, as temperature-control heat couple detects that workpiece needs the temperature of heating region lower than preset temp, then its controller increases output rating; As temperature-control heat couple detects that the temperature in low-temperature heat district, weld seam side exceedes preset temp, then its controller reduces output rating, and high-temperature zone thermal conduction can be prevented the impact of cold zone;
In sum, the present invention can realize subregion temperature control easily, meets the needs of weld seam both sides different heat treatment temperature simultaneously, thus ensures quality product.
Accompanying drawing explanation
Fig. 1 is the front view using welding cylindrical shell of the present invention.
Embodiment
Below in conjunction with accompanying drawing, for its superheater shell ring of hyperbaric heating interchanger and the postheat treatment of tube sheet circular seam welding, the present invention is further detailed explanation.
As shown in the figure, the tube sheet 2 that the cylindrical shell of this hyperbaric heating interchanger comprises superheater shell ring 1 that material is 15CrMoR, material is 20MnMoNb forging, superheater shell ring 1 welds with tube sheet 2 and is connected, weld seam 3 is positioned at therebetween, the region that need heat is the outside surface of weld seam 3 both sides, and weld seam 3 is heated by thermal conduction, for the localized heat treatment process of this welding cylindrical shell, comprise the following steps: 1) with weld seam 3 both sides welded bonds for the region that need heat is determined on border, 2) quantity of electric heating sheets 4,5 needed for the dimensions of superheater shell ring 1 and the external diameter of tube sheet 2, the region that need heat and electric heating sheets 4,5, power and heat calculation weld seam 3 both sides, makes electric heating sheets 4,5 power can meet the heat energy needs of heating region, 3) tie up with tube sheet 2 outside surface the electric heating sheets 4 and 5 that desired number is set at the superheater shell ring 1 of weld seam 3 both sides respectively by iron wire, its specified Heating temperature of the electric heating sheets 4,5 of weld seam 3 both sides is different, the specified Heating temperature of electric heating sheets 4 is higher than electric heating sheets 5, the several piece electric heating sheets 4 or 5 of homonymy heating region is divided into array, the quantity of temperature-control heat couple 6 is set respectively by group number, make each group of electric heating sheets 4 or 5 and temperature-control heat couple 6 one_to_one corresponding, the electric heating sheets 4 or 5 of weld seam both sides is connected with respective controller (not shown) with temperature-control heat couple 6, 4) be not less than 100mm range areas at all electric heating sheets 4,5 and its edge and dress outside lagging material 7, lagging material 7 adopts aluminosilicate refractory fiber, 5) by controller to electric heating sheets 4, 5 energisings are to heat superheater shell ring 1 and tube sheet 2, and the temperature of weld seam 3 both sides superheater shell ring 1 and tube sheet 2 is detected by temperature-control heat couple 6, as thermopair 6 detects the temperature in superheater shell ring 1 or tube sheet 2 region lower than preset temp, its controller strengthens the output rating of electric heating sheets on superheater shell ring 1 or tube sheet 2, the superheater shell ring 1 of weld seam 3 both sides is made to reach respective preset temp with tube sheet 2 temperature, subregion temperature control easily can be realized, meet the needs of weld seam both sides different heat treatment temperature simultaneously, thus guarantee quality product, as thermopair 6 detects that the temperature in superheater shell ring 1 or tube sheet 2 region is higher than preset temp, its controller then reduces the output rating of region electric heating sheets on superheater shell ring 1 or tube sheet 2, can independently regulate its control temperature separately, ensures quality product.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1., for welding a localized heat treatment process for cylindrical shell, it is characterized in that comprising the following steps: 1) with weld seam both sides welded bonds for the region that need heat is determined on border; 2) electric heating sheets quantity needed for cylindrical shell external diameter, the region that need heat, electric heating sheets specification, power and heat calculation, makes electric heating sheets power can meet the heat energy needs of heating region; 3) barrel outer surface in weld seam both sides arranges the electric heating sheets of desired number respectively, different according to weld seam both sides Heating temperature, arranges temperature-control heat couple respectively, be connected by the electric heating sheets of weld seam both sides with temperature-control heat couple with respective controller in its both sides; 4) and its edge outer at all electric heating sheets is not less than 100mm range areas wrapping lagging material; 5) electric heating sheets is energized with heated parts, and detects the temperature of weld seam both sides workpiece by temperature-control heat couple, make the preset temp that the workpiece temperature of weld seam both sides reaches respective.
2. the localized heat treatment process for welding cylindrical shell according to claim 1, is characterized in that: as temperature-control heat couple detects that workpiece needs the temperature of heating region lower than preset temp, then its controller increases output rating; As temperature-control heat couple detects that the temperature in low-temperature heat district, weld seam side exceedes preset temp, then its controller reduces output rating.
CN201410596682.7A 2014-10-31 2014-10-31 Local heat treatment technology for welding cylindrical shell Pending CN104404216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410596682.7A CN104404216A (en) 2014-10-31 2014-10-31 Local heat treatment technology for welding cylindrical shell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410596682.7A CN104404216A (en) 2014-10-31 2014-10-31 Local heat treatment technology for welding cylindrical shell

Publications (1)

Publication Number Publication Date
CN104404216A true CN104404216A (en) 2015-03-11

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Country Status (1)

Country Link
CN (1) CN104404216A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105200224A (en) * 2015-11-10 2015-12-30 山东核电设备制造有限公司 Heat treatment method after local welding of quenched and tempered material super-large container
CN107881318A (en) * 2017-11-15 2018-04-06 武汉大学 A kind of method of optimization design 9%Cr refractory steel pipeline post weld heat treatment number of partitions
CN109880993A (en) * 2019-02-19 2019-06-14 中国石油大学(华东) The not device and method of equal thickness connector local post weld heat treatment temperature field regulation
CN112522503A (en) * 2020-11-16 2021-03-19 西安热工研究院有限公司 Heat treatment method for accurately controlling temperature of weld zones of header on water-cooled wall
CN112621042A (en) * 2021-01-11 2021-04-09 东方电气集团东方锅炉股份有限公司 Method for manufacturing dissimilar steel welded joint of 2.25Cr1Mo0.25V steel and carbon-manganese low alloy steel
CN112676737A (en) * 2021-01-11 2021-04-20 东方电气集团东方锅炉股份有限公司 Method for manufacturing dissimilar steel welded joint of 9Cr1MoV steel and carbon-manganese low-alloy steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128820A (en) * 1998-10-20 2000-10-10 General Electric Co. Method of repairing damaged turbine rotor wheels using differentially controlled temperatures
JP2007063642A (en) * 2005-09-01 2007-03-15 Hitachi Ltd Method for improving remaining stress and coil for high-frequency induction heating
CN102409153A (en) * 2011-11-14 2012-04-11 苏州热工研究院有限公司 Postweld heat treatment method of welded joint of pipelines with different specifications
CN102554401A (en) * 2011-11-28 2012-07-11 石家庄巨力科技有限公司 Method for welding copper oxygen lance end for steelmaking with steel pipe sub
CN102962543A (en) * 2012-11-01 2013-03-13 中国石油天然气股份有限公司 Welding process for red copper and stainless steel dissimilar materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128820A (en) * 1998-10-20 2000-10-10 General Electric Co. Method of repairing damaged turbine rotor wheels using differentially controlled temperatures
JP2007063642A (en) * 2005-09-01 2007-03-15 Hitachi Ltd Method for improving remaining stress and coil for high-frequency induction heating
CN102409153A (en) * 2011-11-14 2012-04-11 苏州热工研究院有限公司 Postweld heat treatment method of welded joint of pipelines with different specifications
CN102554401A (en) * 2011-11-28 2012-07-11 石家庄巨力科技有限公司 Method for welding copper oxygen lance end for steelmaking with steel pipe sub
CN102962543A (en) * 2012-11-01 2013-03-13 中国石油天然气股份有限公司 Welding process for red copper and stainless steel dissimilar materials

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105200224A (en) * 2015-11-10 2015-12-30 山东核电设备制造有限公司 Heat treatment method after local welding of quenched and tempered material super-large container
CN105200224B (en) * 2015-11-10 2018-01-05 山东核电设备制造有限公司 A kind of local post weld heat treatment method of quenched material very large vessels
CN107881318A (en) * 2017-11-15 2018-04-06 武汉大学 A kind of method of optimization design 9%Cr refractory steel pipeline post weld heat treatment number of partitions
CN109880993A (en) * 2019-02-19 2019-06-14 中国石油大学(华东) The not device and method of equal thickness connector local post weld heat treatment temperature field regulation
CN112522503A (en) * 2020-11-16 2021-03-19 西安热工研究院有限公司 Heat treatment method for accurately controlling temperature of weld zones of header on water-cooled wall
CN112522503B (en) * 2020-11-16 2022-06-21 西安热工研究院有限公司 Heat treatment method for accurately controlling temperature of weld zones of header on water-cooled wall
CN112621042A (en) * 2021-01-11 2021-04-09 东方电气集团东方锅炉股份有限公司 Method for manufacturing dissimilar steel welded joint of 2.25Cr1Mo0.25V steel and carbon-manganese low alloy steel
CN112676737A (en) * 2021-01-11 2021-04-20 东方电气集团东方锅炉股份有限公司 Method for manufacturing dissimilar steel welded joint of 9Cr1MoV steel and carbon-manganese low-alloy steel
CN112676737B (en) * 2021-01-11 2022-11-04 东方电气集团东方锅炉股份有限公司 Method for manufacturing dissimilar steel welded joint of 9Cr1MoV steel and carbon-manganese low-alloy steel

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Application publication date: 20150311