CN105823802A - Detection method for judging copper and copper alloy texture based on conductivity test - Google Patents
Detection method for judging copper and copper alloy texture based on conductivity test Download PDFInfo
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- CN105823802A CN105823802A CN201610317532.7A CN201610317532A CN105823802A CN 105823802 A CN105823802 A CN 105823802A CN 201610317532 A CN201610317532 A CN 201610317532A CN 105823802 A CN105823802 A CN 105823802A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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Abstract
The invention discloses a detection method for judging copper and copper alloy texture based on a conductivity test. The detection method includes the steps that a conductivity threshold value corresponding to texture of a tested wokpiece is determined; conductivity of the tested workpiece is detected through a conductive tester; the conductivity of the tested workpiece and the conductivity threshold value corresponding to texture of the tested wokpiece are compared, and if the conductivity of the tested workpiece is smaller than the conductivity threshold value corresponding to texture of the tested wokpiece, it is judged that the texture of the tested workpiece does not meet the component requirement for texture; otherwise, it is judged that the texture of the tested workpiece meets the component requirement for texture. The detection method has the advantages of being high in detection speed, simple, high in accuracy, convenient and suitable for on-site working conditions, and it is not needed to polish the surface of the workpiece or conduct related surface processing on the workpiece.
Description
Technical field
The present invention relates to the copper of power domain and the qualified detection technique of composition of copper alloy workpiece, be specifically related to a kind of judge copper and the detection method of copper alloy material based on conductivity test.
Background technology
Copper and copper alloy are widely used in power transmission and transforming equipment due to its excellent electric property and mechanical property.The electric property of fine copper is excellent, and its mechanical property is the best, and tensile strength is up to 195MPa, and elongation after fracture is up to 30%, suitable with aluminium alloy.The crucial workpiece that T2 copper is widely used in power transmission and transforming equipment, such as contact, the conducting rod of disconnecting switch, there is the water conservancy diversion row of pile crown, anchor ear, grounding copper bar and GIS device, power transmission cable etc. in the winding of transformator, sleeve.In power transmission and transforming equipment, another kind of wide variety of copper alloy is pyrite, and pyrite is made up of two kinds of essential elements of Cu and Zn, generally also has a certain amount of Pb element to improve its processing characteristics.The conductivity of pyrite is less than fine copper, due to the price that its relative fine copper is the cheapest, good environmental suitability, electrical network both can use as water conservancy diversion workpiece, as as anchor ear wire clamp, can also use as form workpiece, such as the pressure relief valve of transformator simultaneously.Copper alloy is widely used in electrical network, there is also the situation of mixed misuse simultaneously.
The content of impurity is controlled to require very sternly by fine copper, and as a example by T2 copper, Cu+Ag content requirement >=99.90%, in actual production, a lot of fine copper workpiece do not reach this requirement, if using hand-held alloy analysis instrument, owing to precision is inadequate, it is impossible to scene is analyzed.In the use of pyrite, owing to pyrite price is lower relative to fine copper, there is also the phenomenon using pyrite to substitute fine copper the most in a device, owing to usual copper alloy workpiece surface exists certain coating, such as silver coating, tin coating etc., use alloy analysis instrument directly workpiece chemical composition not to be analyzed, need that surface of the work is carried out the surface process such as polishing and just can be analyzed, surface of the work can be caused certain damage.Additionally, Pb content is usually no more than 3% in pyrite, when Pb content is more than 3%, the mechanical property of alloy can be made comprehensively to decline, and scene also lacks corresponding detection technique to this.
Traditional on-the-spot alloy detection method uses the detection of hand-held alloy analysis instrument, hand-held alloy analysis instrument carries out testing to surface of the work requirement height, requirement surface of the work is bright and clean, if surface of the work has coating, then need the composition that face coat is carried out could detect workpiece substrate after polishing is removed, have damage to workpiece, inconvenience is also brought at scene；Meanwhile, the detection time is the longest, and one detection period is about 30s.The conductivity of copper alloy is closely bound up with the chemical composition of copper alloy, the change of trace in chemical composition, can cause the fluctuation that conductivity is bigger, therefore, how to realize the detection quickly and accurately to copper and copper alloy material to judge, have become as a key technical problem urgently to be resolved hurrily.
Summary of the invention
The technical problem to be solved in the present invention: apply the problems referred to above during copper and copper alloy material field quick detection for prior art, it is provided that a kind of need not surface of the work is polished or relevant surfaces processes, speed accuracy fast, simple is high, simple and convenient in detection, be applicable to field working conditions judge copper and the detection method of copper alloy material based on conductivity test.
The present invention judges that based on conductivity test the ultimate principle of the detection method of copper and copper alloy material is as follows:
It is known that, fault of construction in the conductivity of metal and metal ingredient, temperature, metal is directly related, wherein the fault of construction in metal is relevant with processing technique such as the cold working of metal, heat treatments, above-mentioned various factors is different to the conductivity influence degree of various metals, therefore the conductivity of metal itself is a complicated physical characteristic influenced by factors, therefore, it is difficult to directly considered a certain factor (such as composition) that assessment affects the conductivity of metal by the conductivity of metal.But, find through carrying out conductivity test test for Multiple components, cold working, the copper of heat treatment and copper alloy material, for the fixing copper of composition or copper alloy, the factor such as cold working, heat treatment is less for the impact of conductivity, and conductivity test instrument carries temperature-compensating in testing and can directly record the conductivity at a temperature of 20 DEG C.Such as T2 copper, consider the factor such as cold working, heat treatment, use conductivity test instrument to record the conductivity at a temperature of its 20 DEG C typically to float between 94%IACS～105%IACS, therefore 94%IACS can be taken as considering the most qualified basis for estimation of composition of T2 copper, such that it is able to realize coming copper and the detection of copper alloy material according to conductivity.
Based on above-mentioned ultimate principle, in order to solve aforementioned technical problem, the technical solution used in the present invention is:
A kind of judging copper and the detection method of copper alloy material based on conductivity test, step includes:
1) the conductivity threshold values that the material of detected workpiece is corresponding is determined；
2) conductivity of the detected workpiece of conductivity test instrument detection is used；
3) conductivity threshold values corresponding for the material of the conductivity of detected workpiece, detected workpiece is compared, if the conductivity threshold values that the conductivity of detected workpiece is corresponding less than the material of detected workpiece, then judge that the material of detected workpiece does not meets the component requirements of material, otherwise judge that the material of detected workpiece does not meets the component requirements of material.
Preferably, the detailed step of described step 1) includes:
1.1) it is respectively adopted different processing technique and makes the testpieces identical with being detected Workpiece structure, material is identical；
1.2) conductivity test instrument is used to detect the conductivity of each testpieces；
1.3) select the minimum conductivity of numerical value as conductivity threshold values corresponding to the material of detected workpiece.
Based on conductivity test, the present invention judges that the detection method of copper and copper alloy material has an advantage that
1, the present invention is based on the special relationship between conductivity and alloy material, use portable conductivity test instrument, carry out detecting the component requirements judging whether the material of detected workpiece meets material to the trade mark of copper and copper alloy, Site Detection step is the most quick and easy, time is short, speed is fast, 1～3s can complete detection, and relatively con-ventional handheld alloy analysis instrument detection speed is faster.
2, the present invention is based on the relation between conductivity and alloy material, use portable conductivity test instrument, carry out detecting the component requirements judging whether the material of detected workpiece meets material to the trade mark of copper and copper alloy, without surface of the work is processed, surface of the work has coat directly to measure, coat will not be caused damage, accomplish the Non-Destructive Testing real to workpiece.
3, traditional in work on the spot fluorescence analysis method (using hand-held alloy analysis to analyze) limited precision, can not accurately judge the copper alloy trade mark and acceptable level, and use this method accurately to judge, have the advantage that accuracy is high.
4, the present invention is based on the relation between conductivity and alloy material, uses portable conductivity test instrument, and instrument is the most portable, it is adaptable to field working conditions condition.
Accompanying drawing explanation
Fig. 1 is the basic procedure schematic diagram of the embodiment of the present invention one method.
Detailed description of the invention
Embodiment one:
In the present embodiment, detected workpiece is the sleeve outlet anchor ear wire clamp of certain 220kV substation transformer, and this sleeve outlet anchor ear wire clamp nominal trade mark is T2 copper, and there is silver coating on anchor ear wire clamp surface, and conductivity is up to more than 94%IACS.
As it is shown in figure 1, the step that the present embodiment judges the detection method of copper and copper alloy material based on conductivity test includes:
1) the conductivity threshold values 94%IACS that the material of detected workpiece is corresponding is determined；
2) conductivity 82.8%IACS of the detected workpiece of conductivity test instrument detection is used；
3) conductivity threshold values 94%IACS corresponding for the material of conductivity 82.8%IACS of detected workpiece, detected workpiece is compared, if the conductivity threshold values that the conductivity of detected workpiece is corresponding less than the material of detected workpiece, then judge that the material of detected workpiece does not meets the component requirements of material, otherwise judge that the material of detected workpiece does not meets the component requirements of material.Due to conductivity 82.8%IACS of detected workpiece, less than conductivity threshold values 94%IACS, therefore the sleeve outlet anchor ear wire clamp in the present embodiment not uses qualified T2 copper production, does not meets the component requirements of material.
In the present embodiment, the detailed step of step 1) includes:
1.1) it is respectively adopted different processing technique and makes the testpieces identical with being detected Workpiece structure, material is identical；
1.2) conductivity test instrument is used to detect the conductivity of each testpieces；
1.3) select the minimum conductivity of numerical value as conductivity threshold values corresponding to the material of detected workpiece.
By abovementioned steps 1.1)～1.3), on the basis of the factor such as cold working, heat treatment of discovery is less for the impact of conductivity, by considering different processing technique, the conductivity of detected workpiece is affected, it is thus possible to test draws the conductivity threshold values that the material of detected workpiece is corresponding, achieve the accurate correspondence between the material of detected workpiece and conductivity threshold values, there is the advantage that judging nicety rate is high.
In application process, the conductivity critical table of the conductivity threshold values setting up various copper and the trade mark of copper alloy material and correspondence thereof can be initialized in advance, to facilitate various copper and the field quick detection of copper alloy material.Such as when T2 copper being detected, owing to conductivity critical table containing the conductivity threshold values 94%IACS of T2 copper and correspondence thereof, therefore when detected workpiece is detected by needs, determine the material trade mark T2 copper of detected workpiece, search described conductivity critical table according to described material trade mark T2 copper, obtain the conductivity threshold values 94%IACS that the material of detected workpiece is corresponding.
Embodiment two:
The present embodiment is identical with embodiment basic skills, and its difference is different for detected workpiece.In the present embodiment, detected workpiece is the copper bar as ground connection diversion component of certain 220kV substation transformer, and this copper bar nominal trade mark is T2 copper, and surface scribbles the paint taking into account anticorrosion and marked effect, uses traditional alloy analysis instrument directly to detect.The present embodiment uses conductivity test instrument detect conductivity 104%IACS of this copper bar, meet the conductivity requirements of T2 copper, show that this copper bar is T2 copper bar, (Cu+Ag) >=99.90%, meet the component requirements of material.
Embodiment three:
The present embodiment is identical with embodiment basic skills, and its difference is different for detected workpiece.In the present embodiment, detected workpiece is the isolation switch contact of certain transformer station 110kV side, according to DL/T1424-2015 " electrical network alloying technology supervision code " requirement, isolation switch contact should use T2 copper production, owing to there is silver coating on the surface of isolation switch contact, and can not damage, therefore isolation switch contact can not use traditional alloy analysis instrument to be analyzed contact compositions.The present embodiment uses conductivity test instrument detect conductivity 27%IACS of this isolation switch contact, do not meet the conductivity requirements of T2 copper, i.e. do not meet the component requirements of material.
Embodiment four:
The present embodiment is identical with embodiment basic skills, and its difference is different for detected workpiece.In the present embodiment, detected workpiece is the anchor ear wire clamp of certain transformer station 110kV reactor, and anchor ear wire clamp nominal material is Zn-Cu pyrite material.The present embodiment use conductivity test instrument detect conductivity 7.1%IACS of this anchor ear wire clamp, the conductivity threshold values corresponding less than the material of Zn-Cu pyrite material, show that the material of this anchor ear wire clamp does not meets pyrite chemical composition requirement, i.e. do not meet the component requirements of material.
Embodiment five:
The present embodiment is identical with embodiment basic skills, and its difference is different for detected workpiece.In the present embodiment, detected workpiece is the soft copper band connected in the middle of certain transformer station upper and lower conductive arm of 110kV disconnecting switch, and according to standard-required, this soft copper band should use T2 copper production.The conductivity using conductivity test instrument to detect this soft copper band in the present embodiment is 83%IACS, and less than conductivity threshold values 94%IACS, therefore the sleeve outlet anchor ear wire clamp in the present embodiment not uses qualified T2 copper production, does not meets the component requirements of material.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (2)
1. one kind judges copper and the detection method of copper alloy material based on conductivity test, it is characterised in that step includes:
1) the conductivity threshold values that the material of detected workpiece is corresponding is determined；
2) conductivity of the detected workpiece of conductivity test instrument detection is used；
3) conductivity threshold values corresponding for the material of the conductivity of detected workpiece, detected workpiece is compared, if the conductivity threshold values that the conductivity of detected workpiece is corresponding less than the material of detected workpiece, then judge that the material of detected workpiece does not meets the component requirements of material, otherwise judge that the material of detected workpiece does not meets the component requirements of material.
The most according to claim 1 judge copper and the detection method of copper alloy material based on conductivity test, it is characterised in that the detailed step of described step 1) includes:
1.1) it is respectively adopted different processing technique and makes the testpieces identical with being detected Workpiece structure, material is identical；
1.2) conductivity test instrument is used to detect the conductivity of each testpieces；
1.3) select the minimum conductivity of numerical value as conductivity threshold values corresponding to the material of detected workpiece.
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| CN201610317532.7A CN105823802A (en) | 2016-05-13 | 2016-05-13 | Detection method for judging copper and copper alloy texture based on conductivity test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338522A (en) * | 2016-09-06 | 2017-01-18 | 苏州新材料研究所有限公司 | High-temperature superconducting strip surface defect quality control method and detection system |
| CN107238757A (en) * | 2017-05-26 | 2017-10-10 | 西安理工大学 | A kind of assay method of copper aluminium heterogeneous material compound transition zone electrical conductivity |
| CN115598166A (en) * | 2022-10-09 | 2023-01-13 | 国网山东省电力公司临沂供电公司（Cn） | Rapid nondestructive transformer coil material detection method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338522A (en) * | 2016-09-06 | 2017-01-18 | 苏州新材料研究所有限公司 | High-temperature superconducting strip surface defect quality control method and detection system |
| CN106338522B (en) * | 2016-09-06 | 2019-08-13 | 苏州新材料研究所有限公司 | A kind of high-temperature superconductor band surface defect quality control method and detection system |
| CN107238757A (en) * | 2017-05-26 | 2017-10-10 | 西安理工大学 | A kind of assay method of copper aluminium heterogeneous material compound transition zone electrical conductivity |
| CN107238757B (en) * | 2017-05-26 | 2019-07-23 | 西安理工大学 | A kind of measuring method of copper aluminium heterogeneous material compound transition zone conductivity |
| CN115598166A (en) * | 2022-10-09 | 2023-01-13 | 国网山东省电力公司临沂供电公司（Cn） | Rapid nondestructive transformer coil material detection method |
| CN115598166B (en) * | 2022-10-09 | 2023-10-13 | 国网山东省电力公司临沂供电公司 | Rapid nondestructive detection method for material of transformer coil |
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Application publication date: 20160803 |