CN109633492B - Method for detecting welding magnetic blow sensitive magnetic induction strength of steel plate - Google Patents
Method for detecting welding magnetic blow sensitive magnetic induction strength of steel plate Download PDFInfo
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- CN109633492B CN109633492B CN201811529642.5A CN201811529642A CN109633492B CN 109633492 B CN109633492 B CN 109633492B CN 201811529642 A CN201811529642 A CN 201811529642A CN 109633492 B CN109633492 B CN 109633492B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
Abstract
The invention discloses a method for detecting the welding magnetic blow sensitive magnetic induction strength of a steel plate, which comprises the steps of processing the steel plate to a proper size; carrying out magnetization treatment on the steel plate; drawing a plurality of Nth isomagnetic lines with intervals along the Nth magnetic field on the surface of the magnetized steel plate; welding along the multiple N-th isomagnetic lines in the sequence from strong to weak of the magnetic field, and observing the magnetic blow-off condition during welding so as to determine the magnetic blow-off sensitive magnetic induction intensity; and taking a metallographic sample from the welding seam with the magnetic blow sensitive magnetic induction strength determined in the step, and detecting the defects of the metallographic sample to determine the magnetic blow sensitive magnetic induction strength. The method can simply and effectively find out the sensitive magnetic induction intensity of the magnetic blow produced by the residual magnetism of the steel plate, control the residual magnetism of the steel plate to be below the sensitive magnetic induction intensity before welding, avoid the magnetic blow phenomenon in the welding process, ensure the welding quality of the steel plate, and avoid excessive demagnetization to cause waste of manpower and financial resources.
Description
Technical Field
The invention relates to the field of welding, in particular to a method for detecting the welding magnetic blow sensitive magnetic induction strength of a steel plate. .
Background
The welding arc is essentially a flexible gas with a certain degree of ionization, macroscopically neutral, but microscopically composed of charged particles of cations and electrons, and neutral particles of atoms and molecules, wherein the cations and electrons move in a certain direction to form a current, which generates a magnetic field around the arc. Therefore, if the magnetic field uniformity distribution generated by the arc welding machine is damaged due to some reason, the arc welding machine deviates from the axial direction of the welding rod (wire) due to uneven stress, namely, a magnetic blow phenomenon is generated.
As is known, generally, to prevent magnetic blow-off, the following schemes are adopted:
1. generally, alternating current welding is adopted, induced current is generated in a conductor due to a changing magnetic field, and the magnetic field generated by the induced current weakens the magnetic field caused by welding current, so that certain magnetic blow is controlled.
2. The residual magnetism on the weldment is reduced, and the residual magnetism around the welding line can be reduced by utilizing a method of locally heating the weldment so as to reduce the magnetic blow of the electric arc;
3. by means of the anti-demagnetization method, the weldment generates an opposite magnetic field to counteract residual magnetism on the weldment, so that the influence of magnetic blow on the welding arc is overcome and eliminated.
In the research at home and abroad, there are many measures and methods for welding in a magnetic field environment, but all the measures and methods are relatively complex or inflexible and convenient, and the effect is not ideal through field welding practice.
For a long time, the welding magnetic blow problem can only be qualitatively analyzed for reasons and how to improve the welding magnetic blow problem after the magnetic blow is generated, and a simple and effective method for quantitatively detecting the strength of the steel plate welding magnetic blow sensitive magnetic steel is not available, so that a proper residual magnetism control range cannot be provided for the site; when the steel plate generates residual magnetism, the complete elimination of the residual magnetism of the steel plate is almost impossible, and the elimination of the residual magnetism consumes a large amount of manpower and material resources. The excessive remanence of the steel plate can generate magnetic blow to influence the welding quality. Therefore, it is very important to select a simple and effective method for testing the welding magnetic blow sensitive magnetic induction strength of the steel plate.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method capable of effectively and quickly detecting the welding magnetic blow-off sensitive magnetic induction strength in various different states.
In order to solve the above problems, embodiments of the present invention mainly provide the following technical solutions:
a method for detecting the welding magnetic blow sensitive magnetic induction strength of a steel plate is characterized by comprising the following steps: the method comprises the following steps:
1) processing the steel plate to a proper size;
2) carrying out magnetization treatment on the steel plate;
3) drawing a plurality of Nth isomagnetic lines which are spaced along the Nth magnetic field between the Nth upper limit and the Nth lower limit of the magnetic field on the surface of the magnetized steel plate;
welding along the plurality of N-th isomagnetic lines in the sequence from strong to weak of the magnetic field, and observing the magnetic blow-off condition during welding until a certain N-th isomagnetic line has the magnetic blow-off phenomenon, and the other N-th isomagnetic line with the magnetic field intensity smaller than that of the N-th isomagnetic line does not have the magnetic blow-off phenomenon, wherein the N-th isomagnetic line with the magnetic blow-off phenomenon is the upper limit of the N +1, and the other N-th isomagnetic line is the lower limit of the N + 1;
the N is selected from natural numbers and is initially 1, the steps are repeated to enable the N to be sequentially increased, the interval of the Nth magnetic field is gradually reduced until the interval of the Nth magnetic field is within a required precision range, and at the moment, the upper limit of the (N + 1) th magnetic induction intensity of the magnetic blow-off sensitivity to be measured is obtained;
4) and taking a metallographic sample from the welding seam with the magnetic blow sensitive magnetic induction strength determined in the step, and carrying out defect detection on the metallographic sample to verify the magnetic blow sensitive magnetic induction strength.
Preferably, the method further includes the steps of 5) replacing one parameter of the welding current, the grounding position and the welding machine type, and repeating the steps 3) and 4) to determine different magnetic blow-out sensitive magnetic induction strengths corresponding to different welding currents, grounding positions and welding machine types.
Preferably, in step 1), the steel plate has a length of 350mm to 600mm, a width of 150mm to 300mm, and a thickness of not more than 50 mm.
Preferably, in order to prevent the surface from being contaminated, the surface of the steel sheet is cleaned before the steel sheet is magnetized in the step 2) to remove rust, water or oil.
In order to prevent the influence of the environment on the steel plate, in the step 2), a permanent magnet jack is used for magnetizing the steel plate.
Preferably, in step 3), the first upper limit is 150GS, the first lower limit is 0GS, and the first magnetic field interval is 10 GS.
In order to facilitate the magnetization of the steel plate, in step 2), the permanent magnet jacks are used to magnetize the steel plate, the length direction of the permanent magnet jacks is consistent with the width direction of the steel plate, and the permanent magnet jacks are located at 1/2 along the length direction of the steel plate.
Preferably, when the step in step 3) is repeated, the steel plate needs to be repeatedly welded, and when the welding seam is repeatedly welded, the welding seam welded last time should be ground.
In order to verify the magnetic induction intensity of the magnetic blow-off sensitivity, after the step 5), a gold phase sample can be taken from the welding line of the magnetic blow-off sensitivity magnetic induction intensity determined in the step and defect detection can be carried out.
Preferably, the welding material matched with the steel plate is selected during welding in the step 3).
By the technical scheme, the technical scheme provided by the embodiment of the invention at least has the following advantages: the method can simply and effectively find out the sensitive magnetic induction intensity of the magnetic blow produced by the residual magnetism of the steel plate, control the residual magnetism of the steel plate to be below the sensitive magnetic induction intensity before welding, avoid the magnetic blow phenomenon in the welding process, ensure the welding quality of the steel plate, and avoid excessive demagnetization to cause waste of manpower and financial resources.
The method adopts the permanent magnet crane to magnetize the steel plate, the magnetic field intensity is basically stable in the welding process, the welding heat influence is small, and the measurement of the welding magnetic blow sensitive magnetic induction intensity of the steel plate is accurate and reliable.
The adopted equipment is simple, and the welding magnetic blow sensitive magnetic induction intensity of different steel plates can be detected only by a magnetometer, a permanent magnet jack and welding equipment; the method can control the measurement precision of the magnetic-bias-blowing sensitive magnetic field strength to be +/-1 gauss.
The method has small influence of the surrounding environment, the steel plate to be measured is magnetized by the permanent magnet in the permanent magnet jack, and the magnetic field intensity of the magnetized steel plate is not influenced by the welding heat and the surrounding magnetic field.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the embodiments of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the embodiments of the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a schematic view of an unloaded state of a permanent magnet jack according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of the adsorption state of a permanent magnet jack of an embodiment of the present invention;
figure 3 shows a schematic view of a permanent magnet jack and steel plate of an embodiment of the present invention after magnetization.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1-3, the method for detecting the welding magnetic blow sensitive magnetic induction strength of the steel plate specifically comprises the following steps:
the steel plate is processed to a proper size, and the size of the steel plate is controlled in a reasonable range, for example, the length is 350mm-600mm, the width is 150mm-300mm, and the thickness is not more than 50 mm. For example, the steel plate chemical composition C of the 06Ni9DR steel is preferably less than or equal to 0.06; si: 0.10 to 0.15; mn: 0.60 to 0.80; p is less than or equal to 0.004; s is less than or equal to 0.002; mo + Cr + Cu is less than or equal to 0.50; ni: 9.0 to 10.0; the balance is Fe, the wall thickness of the steel plate is 21mm, the steel plate can be processed into the size of 350mm (length) multiplied by 150mm (width) multiplied by 21mm (thickness) in the embodiment, and the burrs are removed, so that the cutting danger in the subsequent transportation and placement process is prevented.
Selecting a welding material matched with a steel plate material, wherein the welding material is selected to be more suitable for the actual working condition on site while ensuring similar chemical components and close strength and toughness; for example, welding materials which are widely applied in batches on the field are adopted as welding materials. Because the submerged arc welding material can not be welded along a curve, if the submerged arc welding material is used in the field working condition, a manual welding electrode matched with a steel plate is adopted for replacement. For example, it is preferred to weld a conformable welding material, such as an ESAB electrode, in the field.
Preferably, the surface of the steel plate to be measured should be cleaned, so that a large amount of rust, water or oil stains are prevented from appearing on the surface of the steel plate, and subsequent weld joint quality is further influenced. Of course, if the surface of the steel plate to be measured is clean, the step can be omitted.
The steel plate is magnetized, preferably by selecting suitable permanent magnet jacks 20, and the steel plate 10 is placed on the permanent magnet jacks 20. The double-magnetic-circuit system of the permanent magnet jack 20 consists of a movable magnetic system and a fixed magnetic system, and when the double-magnetic-circuit system is used, the rotation of the movable magnetic system is controlled by a rotating handle, so that the mutual superposition of a movable magnetic system magnetic field and a fixed magnetic system magnetic field is realized, and a strong adsorption force is presented to the outside to suck steel and iron objects; when the rotating handle is put back, the mutual offset of the movable magnetic system magnetic field and the fixed magnetic system magnetic field is realized, no attraction is expressed to the outside, and therefore, the steel object is put down and demagnetized, and the residual magnetism is close to zero. Since the steel sheet is unloaded as shown in fig. 1 and the steel sheet is attracted as shown in fig. 2, the magnet wires on the steel sheet 10 are as shown in fig. 3. If the permanent magnet jack is selected to be too small, the magnetized magnetic field can not reach the magnetic blow sensitive magnetic field intensity; if the magnetic jack is selected to be too large, the minimum magnetizing magnetic field exceeds the magnetic blow sensitive magnetic field intensity, the type range of the permanent magnetic jack is as follows: 100KG to 800 KG.
And, the steel sheet should be laid suitably with the permanent magnetism jack position, and permanent magnetism jack length direction should be unanimous with steel sheet width direction, and the permanent magnetism jack should be located steel sheet length direction 1/2 department simultaneously, and the magnetic field that sends from the permanent magnetism jack N utmost point to the S utmost point is evenly spread out in steel sheet length direction like this.
In the magnetized steel sheet, a plurality of first demagnetizing lines are defined at intervals along the first magnetic field within a range of 150Gs, which is the first upper limit, and 0Gs, which is the first lower limit, specifically, 10Gs, for example, the first magnetic field interval, and the magnetic field strengths of the plurality of first demagnetizing lines are 10Gs, 20Gs, 30Gs, 40Gs, 50Gs, 60Gs, 70Gs, 80Gs, 90Gs, 100Gs, 110Gs, 120Gs, 130Gs, 140Gs, and 150Gs, respectively. A large number of welding tests show that the magnetic blow is serious and the welding can not be carried out when the magnetic blow exceeds 150 GS. Therefore, the range selected by the present application is in the range of 0 GS-150 GS for measurement and study. And drawing the isomagnetic line by using a gauss meter, wherein the range of the gauss meter is 0-200 mT (0-2000 Gs). Resolution ratio: 0.1mT (1Gs) or more.
Welding along the first equimagnetic wires in the order from strong to weak, and observing the magnetic blow-off condition during welding until a certain first equimagnetic wire has a magnetic blow-off phenomenon, and the first equimagnetic wires with intervals smaller than the first equimagnetic wire have no magnetic blow-off phenomenon, so that the first equimagnetic wire is defined as a second upper limit, and the first equimagnetic wire with the magnetic field smaller than the first limit is defined as a second lower limit. For example, when welding is started from the first isomagnetic line 150GS and stopped when no magnetic blow occurs, such as when no magnetic blow is found in the first isomagnetic line 90GS, but magnetic blow occurs in the first isomagnetic line 100GS, it can be judged that the magnetic blow sensitive strength is between 100GS and 90 GS. The first degaussing line 100GS is the second upper limit and the first degaussing line 90GS is the second lower limit.
A plurality of second demagnetizing lines spaced at intervals along the second magnetic field are delineated between the second upper limit and the second lower limit, specifically, the second magnetic field interval is 5GS, 2GS or 1GS, for example, in this embodiment, the second demagnetizing lines have a second magnetic field interval of 1 GS.
And welding along the second equi-magnet wires in the sequence from strong to weak, and observing the magnetic blow condition during welding until one second equi-magnet wire has the magnetic blow phenomenon, wherein the second equi-magnet wire with the interval smaller than the second equi-magnet wire does not have the magnetic blow phenomenon, so that the second equi-magnet wire is defined as a third upper limit, and the second equi-magnet wire with the magnetic field smaller than the second limit is defined as a third lower limit.
And repeating the steps of drawing the isomagnetic lines and welding in sequence, defining a plurality of Nth upper limits and Nth lower limits, drawing a plurality of Nth isomagnetic lines at intervals along the Nth magnetic field, and welding along the plurality of Nth isomagnetic lines, wherein N is a natural number which is initially 1, and increasing one number in sequence by repeating once until the Nth magnetic field interval is required precision, wherein the Nth +1 th upper limit is the measured magnetic blow sensitive magnetic induction strength. For example, in the above example, the required measurement accuracy is 1GS, and it is sufficient to draw the first equi-magnet wire and weld it, and then draw the second equi-magnet wire. For example, in the above example, the demagnetized lines 91GS, 92GS, 93GS, 94GS, 95GS, 96GS, 97GS, 98GS, and 99GS are delineated between the two demagnetized lines 90GS and 100 GS. And welding is carried out to observe the magnetic blow phenomenon, so as to determine the sensitive magnetic induction intensity of the magnetic blow.
It is emphasized that in order to avoid the effect of the previous weld on the subsequent weld, it is recommended to grind off the excess height of the previous weld.
And (4) sampling gold on the welding seam with the magnetic blow sensitive magnetic induction strength determined in the step and carrying out defect detection to verify and determine the magnetic blow sensitive magnetic induction strength.
When the steel plate has residual magnetism, magnetic blow is not necessarily generated in the welding process, and the welding magnetic blow can be generated only when the residual magnetism exceeds the sensitive magnetic induction strength of the magnetic blow, so that the defects of air holes, slag inclusion, incomplete fusion and the like are generated in a welding seam, and the quality of the welding seam after welding is influenced. Therefore, the metallographic sample on the weld of the magnetic sensitivity induction strength is examined to further verify the magnetic sensitivity induction strength.
Specifically, the welding line is polished to 1200 meshes by using sand paper; polishing with polishing cloth, acid etching with 3% nitric acid alcohol, observing macroscopic appearance of weld joint, observing structure state under metallographic microscope and scanning electron microscope, and qualitatively analyzing defects to verify influence of magnetic blow on weld joint quality under sensitive magnetic induction strength. The defects include: the slag inclusion has the advantages that the defects of air holes, slag inclusion and undercut can be observed and judged through a metallographic microscope or naked eyes, the air holes and the inclusions are observed through a scanning electron microscope, the composition, the size and the size of the qualitative slag inclusion are different from the inclusions in the matrix, the size of the slag inclusion is generally larger than that of the inclusions in the matrix by more than one order of magnitude, and the composition is alloy oxide. The inner wall of the air hole is smooth and round under a scanning electron microscope, is round or oval and is easy to identify; these defects are present in the weld and reduce the strength and toughness properties of the weld, as well as reducing plasticity.
And one parameter of the welding current, the grounding position and the welding machine type can be replaced, and the steps 5-9 are repeated, so that different magnetic blow-out sensitive magnetic induction strengths corresponding to different welding currents, grounding positions or welding types are determined. Welder types include dc motors and ac motors.
As shown in table 1, the table is a list of different magnetic induction strengths of the magnetic blow-off sensitivity under different welding methods, different welding materials, and different welding currents.
The method can simply and effectively find out the sensitive magnetic induction intensity of the magnetic blow produced by the residual magnetism of the steel plate, control the residual magnetism of the steel plate to be below the sensitive magnetic induction intensity before welding, avoid the magnetic blow phenomenon in the welding process, ensure the welding quality of the steel plate, and avoid excessive demagnetization to cause waste of manpower and financial resources. In addition, the method adopts the permanent magnet crane to magnetize the steel plate, the magnetic field intensity is basically stable in the welding process, the influence of welding heat is small, and the measurement of the welding magnetic blow sensitive magnetic induction intensity of the steel plate is accurate and reliable. The adopted equipment is simple, and the welding magnetic blow sensitive magnetic induction intensity of different steel plates can be detected only by a magnetometer, a permanent magnet jack and welding equipment; the method can control the measurement precision of the magnetic-bias-blowing sensitive magnetic field strength to be +/-1 Gauss; the method has small influence of the surrounding environment, the steel plate to be measured is magnetized by the permanent magnet in the permanent magnet jack, and the magnetic field intensity of the magnetized steel plate is not influenced by the welding heat and the surrounding magnetic field.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for detecting the welding magnetic blow sensitive magnetic induction strength of a steel plate is characterized by comprising the following steps: the method comprises the following steps:
1) processing the steel plate to a proper size;
2) carrying out magnetization treatment on the steel plate;
3) drawing a plurality of Nth isomagnetic lines which are spaced along the Nth magnetic field between the Nth upper limit and the Nth lower limit of the magnetic field on the surface of the magnetized steel plate;
welding along the plurality of N-th isomagnetic lines in the sequence from strong to weak of the magnetic field, and observing the magnetic blow-off condition during welding until a certain N-th isomagnetic line has the magnetic blow-off phenomenon, and the other N-th isomagnetic line with the magnetic field intensity smaller than that of the N-th isomagnetic line does not have the magnetic blow-off phenomenon, wherein the N-th isomagnetic line with the magnetic blow-off phenomenon is the upper limit of the N +1, and the other N-th isomagnetic line is the lower limit of the N + 1;
the N is selected from natural numbers and is initially 1, the steps are repeated to enable the N to be sequentially increased, the interval of the Nth magnetic field is gradually reduced until the interval of the Nth magnetic field is within a required precision range, and at the moment, the upper limit of the (N + 1) th magnetic induction intensity of the magnetic blow-off sensitivity to be measured is obtained;
4) and taking a metallographic sample from the welding seam with the magnetic blow sensitive magnetic induction strength determined in the step, and carrying out defect detection on the metallographic sample to verify the magnetic blow sensitive magnetic induction strength.
2. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: the method further comprises the steps of 5) replacing one parameter of the welding current, the grounding position and the welding machine type, and repeating the steps 3) and 4) so as to determine different magnetic blow-off sensitive magnetic induction strengths corresponding to different welding currents, grounding positions and welding machine types.
3. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: in the step 1), the steel plate has the proper sizes of 350-600 mm length, 150-300 mm width and 50mm thickness.
4. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: in the step 2), before the steel plate is magnetized, the surface of the steel plate needs to be cleaned to remove rust, water or oil stains.
5. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: in the step 2), the steel plate is magnetized by using the permanent magnet jack.
6. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: in step 3), the first upper limit is 150GS, the first lower limit is 0GS, and the first magnetic field interval is 10 GS.
7. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plates according to claim 5, wherein the method comprises the following steps: in step 2), the length direction of the permanent magnet jacks is consistent with the width direction of the steel plate when the permanent magnet jacks are used for magnetizing the steel plate, and the permanent magnet jacks are positioned 1/2 along the length direction of the steel plate.
8. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: when the step 3) is repeated, the steel plate needs to be repeatedly welded, and when the steel plate is repeatedly welded, the welding seam welded last time needs to be ground.
9. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 2, wherein: and after the step 5), performing gold sampling on the welding line with the magnetic blow sensitive magnetic induction strength determined in the steps 3) and 4) and detecting defects.
10. The method for inspecting the strength of the magnetic induction of the welding magnetic blow-out sensitivity of the steel plate according to claim 1, wherein the method comprises the following steps: and 3) selecting a welding material matched with the steel plate during welding in the step 3).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102019492A (en) * | 2010-11-18 | 2011-04-20 | 中国石化集团第十建设公司 | Demagnetizing and deflective blow preventing device of pipeline welding line |
| CN105312728A (en) * | 2014-06-09 | 2016-02-10 | 山东电力建设第一工程公司 | Device for eliminating influence of continuous high-intensity magnetic field on welding operation |
| CN105957689A (en) * | 2016-06-02 | 2016-09-21 | 西北工业大学 | Pre-weld demagnetization method for narrow gap pulse fusion welding of petroleum drill collar |
| CN108480872A (en) * | 2018-03-23 | 2018-09-04 | 上海拓直汽车科技有限公司 | A kind of welding method for the steel plate that is magnetized |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102015000796B4 (en) * | 2015-01-22 | 2017-03-02 | Schaltbau Gmbh | Switching device with permanent magnetic arc extinguishing |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102019492A (en) * | 2010-11-18 | 2011-04-20 | 中国石化集团第十建设公司 | Demagnetizing and deflective blow preventing device of pipeline welding line |
| CN105312728A (en) * | 2014-06-09 | 2016-02-10 | 山东电力建设第一工程公司 | Device for eliminating influence of continuous high-intensity magnetic field on welding operation |
| CN105957689A (en) * | 2016-06-02 | 2016-09-21 | 西北工业大学 | Pre-weld demagnetization method for narrow gap pulse fusion welding of petroleum drill collar |
| CN108480872A (en) * | 2018-03-23 | 2018-09-04 | 上海拓直汽车科技有限公司 | A kind of welding method for the steel plate that is magnetized |
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