CN104451076B - Case heat treating method after a kind of martensitic precipitation repair welding - Google Patents
Case heat treating method after a kind of martensitic precipitation repair welding Download PDFInfo
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- CN104451076B CN104451076B CN201410848295.8A CN201410848295A CN104451076B CN 104451076 B CN104451076 B CN 104451076B CN 201410848295 A CN201410848295 A CN 201410848295A CN 104451076 B CN104451076 B CN 104451076B
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Abstract
The invention provides case heat treating method after a kind of martensitic precipitation repair welding, it can solve the problem that heating-up temperature is difficult to control to, uniform temperature is poor that existing case heat treating method exists.It uses the method for sensing heating that repair welding part is carried out described local heat treatmet, it is characterized in that: before carrying out local heat treatmet, repair welding part is carried out the heating-up temperature calibration of local heat treatmet, calibrated the temperature difference determining in sensing heating process between surface infrared radiation thermometer temperature and inside parts temperature by the heating-up temperature of local heat treatmet, determine the actual heating-up temperature sensing heating in topical treatment process further according to the described temperature difference.
Description
Technical field
The present invention relates to welding technology field, especially relate to the welding technology field of martensitic precipitation, be specially case heat treating method after a kind of martensitic precipitation repair welding.
Background technology
The defect not meeting prescription can be there is in martensitic precipitation at some positions of heap postwelding, these defects need to carry out local argon arc welding repair welding, and at this moment one-piece parts has been completed the Technology for Heating Processing of solid solution-adjustment-timeliness, stainless steel parts for example with 0Cr13Ni8Mo2Al (PH13-8Mo) can drop to below 350HV in its heat affected area hardness of local repair postwelding, far below the part hardness requirement more than 440HV, therefore need to carry out heat treatment after repair welding, but part entirety can not be carried out Ageing Treatment again, its reason is that overall heating can cause other position mechanical performances of part to decline, it is both bulk heat treatmet and can cause part deformation, thus cause follow-up being difficult to be processed.Therefore the mode of local heat treatmet, usual local heat treatmet mode can only be used to have flame heating, the heating of crawler type heating blanket and induction heating mode；The heating of its Flame is very sensitive to the time, and temperature is difficult to accurately control；And crawler type heating blanket is difficult to fit in completely piece surface so that part is too high with heating blanket contact position temperature and on the low side not in contact with the position temperature arrived；Though the control temperature that common sensing heating can be relatively stable, its temperature being based only on piece surface controls, and temperature uniform temperature is difficult to meet customer requirement.
Summary of the invention
For the problems referred to above, the invention provides case heat treating method after a kind of martensitic precipitation repair welding, it can solve the problem that heating-up temperature is difficult to control to, uniform temperature is poor that existing case heat treating method exists.
Case heat treating method after a kind of martensitic precipitation repair welding, it uses the method for sensing heating that repair welding part is carried out described local heat treatmet, it is characterized in that: before carrying out local heat treatmet, repair welding part is carried out the heating-up temperature calibration of local heat treatmet, the temperature difference determining in sensing heating process between surface infrared radiation thermometer temperature and inside parts temperature is calibrated by the heating-up temperature of described local heat treatmet, actual sensed heating-up temperature in topical treatment process is determined further according to the described temperature difference, with described actual sensed heating-up temperature, described repair welding part is carried out local heat treatmet.
It is further characterized by
The described heating-up temperature calibration that repair welding part carries out local heat treatmet, comprises the following steps:
(1) preparation calibration part: use and prepare described calibration part with the material of the described identical material of repair welding part, then the one side at described calibration part bores three instrument connections, the position of described three instrument connections is corresponding with the end positions allowing maximum repair welding length range on described repair welding part and middle position respectively, the degree of depth of described instrument connection is position corresponding with described calibration part testing hole on described repair welding part to the distance between repair welding Weld pipe mill, and on the correspondence position of the weld heat-affected zone center that described instrument connection also should be at described repair welding part；
(2) preparing induction heating apparatus, make two induction coils, the both ends of described induction coil are provided with intermediate frequency magnetic conductor, and said two induction coil connects induction power supply；
(3) temperature correction, described calibration part is positioned between said two induction coil, the position of the repair welding position of said two induction coil described certified products part corresponding with described calibration part is parallel, then three contact thermocouples are positioned in three instrument connections of described calibration part, and by the center of surface infrared radiation thermometer alignment heating region, when described three contact thermocouple displays temperatures are in repair welding part predetermined localized heat treatment process heating temperature range T1, record temperature T2 of described sensing apparatus, using temperature T2 of described surface infrared radiation thermometer as actual sensed heating-up temperature when repair welding part is carried out local heat treatmet.
It is further characterised by:
The aperture of described instrument connection is 1mm；
Described calibration part need to be through the heat treatment process as described repair welding part and mechanical process so that the materials behavior of described calibration part is consistent with the materials behavior of described repair welding part, it is ensured that the accuracy of described temperature correction；
Described surface infrared radiation thermometer uses the infrared radiation thermometer with closed loop control function；
Described induction power supply uses the superaudio power supply of 30Hz.
The beneficial effects of the present invention is: it is calibrated by the heating-up temperature that repair welding part carries out local heat treatmet and determines repair welding part piece surface temperature and temperature difference of center, part inside weld heat affected area temperature when sensing heating, the actual heating-up temperature of repair welding parts locally heat treatment is determined according to this temperature difference size, such that it is able to accurately control the heating-up temperature of part repair welding heat affected area, ensure the uniform temperature in part repair welding region during local heat treatmet, it is ensured that part repair welding heat affected area hardness meets requirement；Wherein heating-up temperature calibration, really by the heating process to the localized heat treatment process simulating repair welding part with repair welding part material, calibration part that materials behavior is identical, and during this simulation heating, gather calibration piece surface temperature and the temperature difference of temperature in the region in the repair welding heat-affected zone of corresponding repair welding part, actual repair welding part heating-up temperature in localized heat treatment process is determined according to this temperature difference, its method is simple, and calibration result is reliable；Induction heating apparatus is provided with intermediate frequency magnetic conductor between two coils, it is possible to further ensure that heating uniform temperature；And in order to induction heating power uses the superaudio power supply of 30Hz to ensure that sensing heating thickness.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of repair welding parts locally heat treatment position in the embodiment of the present invention；
Fig. 2 is embodiment of the present invention alignment part schematic top plan view；
Fig. 3 is to use induction heating apparatus that calibration part is carried out the schematic diagram of sensing heating in the embodiment of the present invention.
Detailed description of the invention
The implementation process of the inventive method is specifically described below in conjunction with an EXPERIMENTAL EXAMPLE:
A kind of part, its material is 0Cr13Ni8Mo2Al, and its repair welding greatest length L allowed is 50mm, and after defect repair welding, the situation that hardness declines occurs in heat affected area, will carry out local heat treatmet for its heat affected area (see figure 1), localized heat treatment process is established as 530 ± 5 DEG C, temperature retention time 2 hours.In Fig. 1,1 is overlay cladding, and 2 is mother metal, and 3 is repair welding weld seam；
null(1) preparation calibration part: use material preparation calibration part 6 as this part，And this calibration part should through heat treatment and mechanical process as this part thus ensure that materials behavior is identical，One side at calibration part bores three instrument connections，It is respectively instrument connection A、Instrument connection B and instrument connection C，See Fig. 2，The position of three instrument connections is corresponding with the end positions allowing maximum repair welding length range stated on repair welding part and middle position respectively，And three instrument connection A、B、The degree of depth of C，It is position corresponding with this instrument connection on repair welding part to distance D between repair welding Weld pipe mill，See Fig. 1，A ' is the position signal of instrument connection A correspondence repair welding part on calibration part 6，And instrument connection also should be on the correspondence position of weld heat-affected zone center of repair welding part，The aperture d of three instrument connections is 1mm；
(2) induction heating apparatus is prepared, make two induction coils 4, the length of two induction coils 4 is 60mm, width is 8mm, thickness is 6mm, and two induction coil two ends are separately installed with intermediate frequency magnetic conductor 5, see Fig. 3, two induction coils 4 connect induction power supply, and induction power supply uses 30Hz superaudio power supply；
(3) temperature correction, calibration part 6 is positioned between upper and lower two induction coils 4, see Fig. 3, two load coils 4 are parallel with the position of the repair welding position of calibration part 6 corresponding repair welding part, then three contact thermocouples are positioned over three instrument connection A of calibration part, B, in C, and infrared radiation thermometer is directed at the center of heating region, when three contact thermocouple displays temperatures are in repair welding part predetermined localized heat treatment process heating temperature range T1=530 ± 5 DEG C, temperature T2=480 DEG C of record infrared radiation thermometer, using T2 as actual sensed heating-up temperature when repair welding part is carried out local heat treatmet；
(4) repair welding part carrying out local heat treatmet, repair welding position is placed identical with the part placement of above-mentioned steps (3) alignment, induction heating temperature is set as 480 DEG C, heats 2 hours；
(5) after heat treatment, repair welding part position is dissected, detect its repair welding weld heat-affected zone hardness >=440HV.
Use the inventive method batch to after part repair welding during local heat treatmet, in order to eliminate such environmental effects as far as possible, be required to carry out temperature correction before each repair welding part is carried out local heat treatmet.
Claims (5)
1. case heat treating method after a martensitic precipitation repair welding, it uses the method for sensing heating that repair welding part is carried out described local heat treatmet, it is characterized in that: before carrying out local heat treatmet, repair welding part is carried out the heating-up temperature calibration of local heat treatmet, calibrated the temperature difference determining in sensing heating process between surface infrared radiation thermometer temperature and inside parts temperature by the heating-up temperature of described local heat treatmet, determine the actual heating-up temperature sensing heating in topical treatment process further according to the described temperature difference；The described heating-up temperature calibration that repair welding part carries out local heat treatmet, comprises the following steps:
(1) preparation calibration part: use and prepare described calibration part with the material of the described identical material of repair welding part, then the one side at described calibration part bores three instrument connections, the position of described three instrument connections is corresponding with the end positions allowing maximum repair welding length range on described repair welding part and middle position respectively, the degree of depth of described instrument connection is position corresponding with described calibration part testing hole on described repair welding part to the distance between repair welding Weld pipe mill, and on the correspondence position of the weld heat-affected zone center that described instrument connection also should be at described repair welding part；
(2) preparing induction heating apparatus, make two induction coils, the two ends of said two induction coil are separately installed with intermediate frequency magnetic conductor, and said two induction coil connects induction power supply；
(3) temperature correction, described calibration part is positioned between said two induction heating apparatus, said two induction heating apparatus is parallel with the position of the repair welding position of described calibration part corresponding certified products part, then three contact thermocouples are positioned in three instrument connections of described calibration part, and by the center of surface infrared radiation thermometer alignment heating region, when described three contact thermocouple displays temperatures are in repair welding part predetermined localized heat treatment process heating temperature range T1, record temperature T2 of described surface infrared radiation thermometer, using temperature T2 of described sensing apparatus as actual sensed heating-up temperature when repair welding part is carried out local heat treatmet.
Case heat treating method after a kind of martensitic precipitation repair welding the most according to claim 1, it is characterised in that: the aperture of described instrument connection is 1mm.
Case heat treating method after a kind of martensitic precipitation repair welding the most according to claim 1, it is characterized in that: described calibration part need to be through the heat treatment process as described repair welding part and mechanical process, the materials behavior making described calibration part is consistent with the materials behavior of described repair welding part, it is ensured that the accuracy of described temperature correction.
Case heat treating method after a kind of martensitic precipitation repair welding the most according to claim 1, it is characterised in that: described surface infrared radiation thermometer uses the infrared radiation thermometer with closed loop control function.
Case heat treating method after a kind of martensitic precipitation repair welding the most according to claim 1, it is characterised in that: described induction power supply uses the superaudio power supply of 30Hz.
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| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101328567A (en) * | 2008-07-28 | 2008-12-24 | 中国航空工业第一集团公司北京航空制造工程研究所 | Double electron beam partial heat treatment method after refractory metal material is welded |
| CN101805822A (en) * | 2010-04-14 | 2010-08-18 | 攀钢集团冶金工程技术有限公司 | Thermal treatment method of 15CrMoG steel annular welding line |
| CN103170777A (en) * | 2013-03-20 | 2013-06-26 | 上海锅炉厂有限公司 | Metal pipe butt-joint circumferential seam heating device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328567A (en) * | 2008-07-28 | 2008-12-24 | 中国航空工业第一集团公司北京航空制造工程研究所 | Double electron beam partial heat treatment method after refractory metal material is welded |
| CN101805822A (en) * | 2010-04-14 | 2010-08-18 | 攀钢集团冶金工程技术有限公司 | Thermal treatment method of 15CrMoG steel annular welding line |
| CN103170777A (en) * | 2013-03-20 | 2013-06-26 | 上海锅炉厂有限公司 | Metal pipe butt-joint circumferential seam heating device |
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