CN102796863A - Method used for local postweld heat treatment of large-size steel casting after rewelding - Google Patents
Method used for local postweld heat treatment of large-size steel casting after rewelding Download PDFInfo
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- CN102796863A CN102796863A CN2012102550952A CN201210255095A CN102796863A CN 102796863 A CN102796863 A CN 102796863A CN 2012102550952 A CN2012102550952 A CN 2012102550952A CN 201210255095 A CN201210255095 A CN 201210255095A CN 102796863 A CN102796863 A CN 102796863A
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Abstract
The invention relates to a method of a local postweld heat treatment of a steel casting, and particularly relates to a method used for a local postweld heat treatment of a large-size steel casting after rewelding. The method comprises the following steps of: firstly, carrying out hardness detection on a welding zone after rewelding, wherein the hardness does not exceed 40-60 HB (heavy barrel) of a standard requirement maximally; carrying out an induction heat treatment, wherein the specific processing parameter of the induction heat treatment is that the lifting temperature speed is 10-20 DEG C/min, the holding time is 1-4 hours, the holding temperature is +20-40 DEG C of normal postweld heat treatment temperature, and the heating depth is 30-100 mm; and carrying out hardness detection and NDT detection on a welding meat region, a welding seam region and a base material of a treatment defect after induction heat treatment, wherein after the detection results meet the requirement, the local postweld heat treatment is finished. The method provided by the invention has the advantages that the technological method is unique, the operation is simple, the method is suitable for the large-size steel casting and can improve a local postweld heat treatment effect, the product quality is guaranteed and the production efficiency is improved, and the cost is reduced.
Description
Technical field
The present invention relates to the method for the local postweld heat treatment of a kind of steel casting, especially relate to the method for local postweld heat treatment after a kind of defects of large-scale steel-casting soldering.
Background technology
The soldering of defects of large-scale steel-casting at present; Steel casting product such as steam turbine, internal combustion turbine, water power, nuclear power; Most of client requires must not carry out soldering again after the final postweld heat treatment; Carry out whole postweld heat treatment again otherwise need advance stove, especially big the or more serious part of defective for the soldering amount.Meet but examine entirely for NDT, after the final postweld heat treatment, the soldering of indivedual a spot of little defectives of finding is again carried out whole postweld heat treatment if advance stove again, also can bring some spinoffs.For example, advance stove again and carry out postweld heat treatment, can cause the uncontrollable distortion of foundry goods for some roughing or precision work finishes and yielding foundry goods; For some little defective or qualified defectives of soldering that does not originally exceed standard, advance the stove postweld heat treatment again, also can cause defective to exceed standard not only or defective but also defective after coming out of the stove sometimes.
The method of at present a small amount of little defective being carried out local postweld heat treatment after soldering has: combustion gas grilled gun heating method and infrared resistive heating blanket heating method.
1) adopt the combustion gas grilled gun that defective is implemented heat treated, need two people to cooperate enforcement, operator's technical ability is required height, disadvantage is the bad control of temperature of heating, and artifical influence factor is big, poor processing effect.This traditional way is eliminated already.
2) adopt infrared resistive heating blanket that defective is implemented heating, use temperature control instrument to carry out processing parameter controls such as temperature, comparatively speaking, artifical influence factor reduces, and after the ripe standard of partial heat treatment technological test, can be used in partial postweld heat treatment aspect.But its range of application limitation, through resistance heating wire's heating of switching on, again with the heat transferred foundry goods, electric heating loss is very big, so thermo-efficiency is also lower, power factor is low, and heat-up rate is slow, and the heat treated time is longer; For the temperature that makes little welding flaw position reaches processing requirement, the electric blanket area of laying is bigger, and the foundry goods heating surface area is big, the foundry goods of wall thickness especially, power wastage; In addition, pellet resistance heating blanket shape specification is limited, bending that can not be by a relatively large margin, and wire spiral is perishable, and Yi Liandian is dangerous.
Also do not overcome at present the way of above-mentioned defective.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of process method unique, easy and simple to handle, be applicable to large-scale steel-casting can improve local postweld heat treatment effect, guarantee quality product and a kind of defects of large-scale steel-casting soldering of enhancing productivity, reducing cost after the method for local postweld heat treatment.
In order to realize goal of the invention, the present invention realizes through following mode:
The method of local postweld heat treatment after a kind of defects of large-scale steel-casting soldering is characterized in that: this method is at first to carry out welding zone hardness after the rewelding to detect, the highest 40～60HB that is not above standard and requires of hardness; Adopt induction heat treatment, the concrete processing parameter of induction heat treatment is 10～20 ℃/min of warming and cooling rate, soaking time 1～4h; Holding temperature is a normal postweld heat treatment temperature+20～40 ℃; Heat penetration 30～100mm is after the induction heat treatment, to weldering meat, weld seam, this three district of mother metal of processing defective carrying out hardness and NDT detects; After all meeting the requirements, then local postweld heat treatment finishes;
Said induction heating power is full air cooling IGBT formula, and ruhmkorff coil is the mosquito-repellent incense formula.
The present invention has following effect:
1) process method is unique, easy and simple to handle: method provided by the invention is carried out welding zone hardness detection earlier headed by this method; 40～100HB of the highest requirement that is not above standard of hardness is satisfactory can to carry out local postweld heat treatment; Carry out induction heat treatment then, 10～20 ℃/min of concrete processing parameter warming and cooling rate of induction heat treatment, soaking time 1～4h; Holding temperature is a normal postweld heat treatment temperature+20～40 ℃; Heat penetration 30～100mm, the selection of soaking time is that 2min/mm and wall thickness of living in are taken all factors into consideration according to depth of defect mainly, holding temperature is mainly confirmed according to wlding material and the hardness that welding three districts are detected.The hardness scope that all meets the requirements in institute's degree of depth that requires is finally guaranteed in the selection of soaking time and holding temperature; After the induction heat treatment, to weldering meat, weld seam, this three district of mother metal of processing defective carrying out hardness and NDT detects, after all meeting the requirements, then local postweld heat treatment finishes.
2) be applicable to improving local postweld heat treatment effect, guaranteeing quality product and enhance productivity, reduce cost of large-scale steel-casting: induction heating provided by the invention flows through powerful medium-high frequency in inductor block be the 12-25KHz electric current; In conductor, will produce inductive current, so conductor is heated rapidly.Induction heating power has been widely used in metal heat treatmet, quenching, diathermanous, melting, welding, hot jacket, the electron tube occasions such as heating, semiconductor material refining, plastic heat sealing, baking and purification of degassing.Induction heating and gaseous combustion heating or energising heating are compared, and have significantly energy-conservation, noncontact, speed is fast, efficient is high, operation realizes remarkable advantages such as robotization simply, easily.Especially the inversion device in the present induction heating power; The industrial frequency AC electric energy is for conversion into the form that several thousand high-frequency electrical energys to the hundreds of kilohertz have determined device; It has experienced the development course that generally adopts IGBT from valve, thyristor up till now; Thereby equipment is greatly simplified, diminished, efficient is higher.In the production scene, directly be utilized under the medium-high frequency the action of a magnetic field inductive current that produces and cause foundry goods conductor self-heating and heat, through controlling the local postweld heat treatment that relevant heating process parameter realizes the soldering fault location.Through a large amount of tests and on-the-spot utilization, adopt the medium-high frequency induction heating to carry out the local postweld heat treatment of large-scale steel-casting after, hardness disposable coincidence rate in welding zone is more than 90%, NDT coincidence rate 100%.Than 3～4 times of resistance Infrared Heating blanket formula partial heat treatment production cycle shortenings, energy consumption reduces by 93%, and remarkable economical use value is arranged.
Said induction heating power is full air cooling IGBT formula, and ruhmkorff coil is the mosquito-repellent incense formula.
Embodiment
Embodiment one: to low-carbon steel material, welding three district's hardness requirement reach 160～200HB after the final thermal treatment.Then after the rewelding, Hardness Control is at 180～240HB, and what meet this requirement can carry out local induction welding post-heat-treated.10～20 ℃/min of concrete processing parameter warming and cooling rate of induction heat treatment, soaking time 1～4h, holding temperature is 580～630 ℃, and final hardness is 160～190HB after the thermal treatment, and three district's hardness and NDT detect, and all meet the requirements.
Embodiment two: to CrMo (V) low alloy steel material, welding three district's hardness requirement reach≤240HB after the final thermal treatment.Then after the rewelding, Hardness Control is at 280～340HB, and what meet this requirement can carry out local induction welding post-heat-treated.10～20 ℃/min of concrete processing parameter warming and cooling rate of induction heat treatment, soaking time 1～4h, holding temperature is 660～720 ℃, final hardness is 150～220HB after the thermal treatment.Three district's hardness and NDT detect, and all meet the requirements.
Embodiment three: to CrNi (Mo) Martensite Stainless Steel material, welding three district's hardness requirement reach 220～320HB after the final thermal treatment.Then after the rewelding, Hardness Control is at 240～360HB, and what meet this requirement can carry out local induction welding post-heat-treated.10～20 ℃/min of concrete processing parameter warming and cooling rate of induction heat treatment, soaking time 1～4h, holding temperature is 580～630 ℃, final hardness is 240～310HB after the thermal treatment.Three district's hardness and NDT detect, and all meet the requirements.
Above-mentioned holding temperature is a normal postweld heat treatment temperature+20～40 ℃; Heat penetration 30～100mm; The selection of soaking time is that 2min/mm and wall thickness of living in are taken all factors into consideration according to depth of defect mainly, and holding temperature is mainly confirmed according to wlding material and the hardness that welding three districts are detected.The hardness scope that all meets the requirements in institute's degree of depth that requires is finally guaranteed in the selection of soaking time and holding temperature.
The above-mentioned induction heating power of stating is full air cooling IGBT formula, and ruhmkorff coil is the mosquito-repellent incense formula.
Claims (2)
1. the method for local postweld heat treatment after the defects of large-scale steel-casting soldering, it is characterized in that: this method is at first to carry out welding zone hardness after the rewelding to detect, the highest 40～60HB that is not above standard and requires of hardness; Adopt induction heat treatment, the concrete processing parameter of induction heat treatment is 10～20 ℃/min of warming and cooling rate, soaking time 1～4h; Holding temperature is a normal postweld heat treatment temperature+20～40 ℃; Heat penetration 30～100mm is after the induction heat treatment, to weldering meat, weld seam, this three district of mother metal of processing defective carrying out hardness and NDT detects; After all meeting the requirements, then local postweld heat treatment finishes.
2. the method for local postweld heat treatment after a kind of defects of large-scale steel-casting soldering as claimed in claim 1 is characterized in that: said induction heating power is full air cooling IGBT formula, and ruhmkorff coil is the mosquito-repellent incense formula.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710519A (en) * | 2013-12-26 | 2014-04-09 | 哈尔滨工业大学 | Induction heating partial heat treatment method applied to metal welding piece |
| CN104531962A (en) * | 2015-01-16 | 2015-04-22 | 遵义拓特铸锻有限公司 | Welding repair vacuum heat treatment method after martensitic stainless steel casting is machined in finish mode |
| CN105400946A (en) * | 2015-10-29 | 2016-03-16 | 中国航空工业集团公司北京航空材料研究院 | Solid solution technique preventing welding bead of Ti3Al guide vane inner ring from high-temperature cracking after repair welding |
| CN105414878A (en) * | 2015-12-15 | 2016-03-23 | 共享铸钢有限公司 | High-heat-resistance alloy steel casting defect repair method |
| CN105729040A (en) * | 2016-05-17 | 2016-07-06 | 薛龙飞 | Repairing method of chilling chamber of gasification furnace |
| CN107619921A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of martensite heat-resistant steel weld bond |
| CN110405319A (en) * | 2019-08-15 | 2019-11-05 | 江苏京成机械制造有限公司 | The process for welding repair of heat resisting cast steel ZG40Cr24Ni9Si2NRe |
| CN111187883A (en) * | 2020-02-28 | 2020-05-22 | 广西玉柴机器股份有限公司 | Method for solving problem of high local hardness of cast iron casting after weld repair |
| CN114888405A (en) * | 2022-03-31 | 2022-08-12 | 阳江核电有限公司 | Method for eliminating defects of large heat-resistant steel special-shaped welded joint of nuclear power station on line |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103710519A (en) * | 2013-12-26 | 2014-04-09 | 哈尔滨工业大学 | Induction heating partial heat treatment method applied to metal welding piece |
| CN104531962A (en) * | 2015-01-16 | 2015-04-22 | 遵义拓特铸锻有限公司 | Welding repair vacuum heat treatment method after martensitic stainless steel casting is machined in finish mode |
| CN105400946B (en) * | 2015-10-29 | 2017-10-27 | 中国航空工业集团公司北京航空材料研究院 | One kind prevents Ti3The solid solution craft that weld seam high temperature ftractures after Al stator inner ring repair weldings |
| CN105400946A (en) * | 2015-10-29 | 2016-03-16 | 中国航空工业集团公司北京航空材料研究院 | Solid solution technique preventing welding bead of Ti3Al guide vane inner ring from high-temperature cracking after repair welding |
| CN105414878B (en) * | 2015-12-15 | 2017-10-31 | 共享铸钢有限公司 | A kind of repair method of high heat-resisting alloy steel casting defect |
| CN105414878A (en) * | 2015-12-15 | 2016-03-23 | 共享铸钢有限公司 | High-heat-resistance alloy steel casting defect repair method |
| CN105729040A (en) * | 2016-05-17 | 2016-07-06 | 薛龙飞 | Repairing method of chilling chamber of gasification furnace |
| CN107619921A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of martensite heat-resistant steel weld bond |
| CN107619921B (en) * | 2017-09-29 | 2019-01-25 | 彭娟 | A kind of intermediate-frequency induction heating technique of martensite heat-resistant steel weld bond |
| CN110405319A (en) * | 2019-08-15 | 2019-11-05 | 江苏京成机械制造有限公司 | The process for welding repair of heat resisting cast steel ZG40Cr24Ni9Si2NRe |
| CN111187883A (en) * | 2020-02-28 | 2020-05-22 | 广西玉柴机器股份有限公司 | Method for solving problem of high local hardness of cast iron casting after weld repair |
| CN114888405A (en) * | 2022-03-31 | 2022-08-12 | 阳江核电有限公司 | Method for eliminating defects of large heat-resistant steel special-shaped welded joint of nuclear power station on line |
| CN114888405B (en) * | 2022-03-31 | 2023-12-05 | 阳江核电有限公司 | Method for online eliminating defects of special-shaped welding joint of large heat-resistant steel in nuclear power station |
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Application publication date: 20121128 |