CN201069428Y - Measuring device for groove erosion depth in the welding pipe welding slot area - Google Patents
Measuring device for groove erosion depth in the welding pipe welding slot area Download PDFInfo
- Publication number
- CN201069428Y CN201069428Y CNU2007200726184U CN200720072618U CN201069428Y CN 201069428 Y CN201069428 Y CN 201069428Y CN U2007200726184 U CNU2007200726184 U CN U2007200726184U CN 200720072618 U CN200720072618 U CN 200720072618U CN 201069428 Y CN201069428 Y CN 201069428Y
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- slide bar
- milscale
- probe
- weld metal
- welded tube
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- 230000003628 erosive effect Effects 0.000 title description 4
- 238000003466 welding Methods 0.000 title description 4
- 239000000523 sample Substances 0.000 claims abstract description 80
- 238000005259 measurement Methods 0.000 claims abstract description 45
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model discloses a device for measuring the corrosion depth of grooves in the weld zone of a welded tube. The measuring device comprises a micrometer consisting of a micrometric screw and a probe, wherein, the probe is arranged at the bottom of the of the micrometric screw; a rise/fall clamping component consisting of a workbench, a slide bar and a clamper, wherein, the slide bar is arranged on the workbench in a way that the bottom end thereof is vertically fixed on the workbench, the clamper is arranged on the slide bar so that one end thereof is connected with the slide bar and the other end is fastened with the micrometer; a sample table arranged on the top surface of the workbench; a passage decision table provided with wires at the input and output ends thereof and connected with the micrometer and the sample table respectively. The measuring device can directly provide measurement results via the micrometer with high accuracy and reliability of measurement data; can realize the multipoint measurement according to the actual need, using the average value to increase the measurement accuracy; and is easy to operate without needing professional staff and helps to shorten the measurement period. Additionally, the measuring device has low manufacturing cost and can reduce the measurement cost while increasing economic returns.
Description
Technical field
The utility model relates to welded tube weld metal zone guttering corrosion performance detection device, more particularly, relates to a kind of welded tube weld metal zone guttering corrosion depth measurement device, and this measurement mechanism can be measured the guttering corrosion degree of depth fast.
Background technology
Because there are marked difference in the welded tube weld metal zone of alternating-current resistance welding (HF-ERW) and micro-area composition, inclusion content and the microstructure of mother metal, make the current potential of weld metal zone be lower than the current potential of base metals.When the weld metal zone had an amount of corrosive medium to exist, potential difference (PD) therebetween can make between weld metal zone and the base metals and form electrochemical primary cells, caused weld seam to produce comparatively serious local grooving corrosion.By the essence of discovering guttering corrosion be the welded tube weld metal zone of alternating-current resistance welding (HF-ERW) because of the inhomogeneous bimetallic corrosion that in surrounding medium or transmission medium, causes of local phase electrochemical, therefore need butt welded seam district guttering corrosion performance to detect.At present, this guttering corrosion performance is to be characterized by the guttering corrosion sensitivity coefficient, can measure by galvanochemistry constant potential polarization method.This method is that first button encapsulation with certain size is placed in the 3.5%NaCl solution, by adding-electrolysis that polarizes of the constant potential of 550mV (vs.SCE), after continuing test 144h, remove the corrosion product of specimen surface, and calculate sample mean corrosion depth d1 according to the weight loss of unit area, by measuring the actual grade d2 of erosion grooves, just can obtain guttering corrosion sensitivity coefficient α by calculating at last again, computing formula is α=d2/d1.At present, still there be not equipment or the device that is specifically designed to the actual measurement welded tube weld metal zone guttering corrosion degree of depth both at home and abroad.The general measuring method that adopts is: the cross section metallographic specimen of the sample of preparation corrosion earlier, amplify by metaloscope or scanning electron microscope then and observe and estimate.But there is following shortcoming in this measuring method:
(1) corrosion sample in cross section metallographic specimen preparation difficulty, preparation process is loaded down with trivial details, wastes time and energy, and has relatively high expectations, otherwise will directly cause measuring error to increase.(2) measurement point is limited, each metallographic specimen can only be used for the DATA REASONING at a position of groove, and can not obtain corrosion depth information along the groove different parts, test point of every increase, just need (or once) metallographic specimen of preparation, greatly increase the workload of specimen preparation, influenced work efficiency.(3) metaloscope or scanning electron microscope are generally adopted in this depth survey, and scanning electron microscope belongs to large-sized analytic instrument equipment, and measurement expense is higher, and generally all need the professional to operate, and are difficult to measure whenever and wherever possible as required.Therefore (4) because the corrosion specimen surface presents unevenly usually, determine relatively difficulty of reference field that gash depth measures, only can roughly choose a position in visual field according to the observation, thereby reduce data veracity.In addition, what this method adopted is estimation, makes data be difficult to be accurate to 0.01mm, but generally speaking, the guttering corrosion degree of depth of sample base material and weld seam is all less, and in the time of in 0.10mm, so there is very big measuring error in this measuring method.
The utility model content
, operating difficulties limited, measurement expense height and the big shortcoming of measuring error at the above-mentioned measurement specimen preparation difficulty, the measurement point that exist in the prior art, the purpose of this utility model provides a kind of welded tube weld metal zone guttering corrosion depth measurement device, this measurement mechanism is simple in structure, easy to use, not only can improve measuring speed and precision, but also reduce the measurement cost.
For achieving the above object, the utility model adopts following technical scheme:
This welded tube weld metal zone guttering corrosion depth measurement device comprises: milscale, comprise micrometric screw and probe, and probe is located at the bottom of micrometric screw, and is connected and fixed with micrometric screw; The lifting clamping part comprises worktable, slide bar and anchor clamps, and slide bar is located on the worktable, lower end and worktable vertical fixing; Anchor clamps are located on the slide bar, and an end is connected with slide bar, and the other end clamps with milscale and is connected; Sample bench is located at worktable upper surface; The path decision table, input, output terminal are respectively equipped with lead, and are connected respectively to milscale and sample bench by lead.
Described micrometric screw bottom center has circular hole, and described probe one end is located in the circular hole; The micrometric screw radial surface also has screw, and communicates with circular hole, passes screw and probe holds out against and fixing by puller bolt.
Described anchor clamps one end is provided with circular hole, on slide bar, and holds out against fixingly by puller bolt and slide bar by circle hole sleeve, and the anchor clamps other end is clamped milscale, and is fixedly clamped by set bolt and milscale.
Described sample bench bottom is provided with horizontal adjustment bolt, and the horizontal adjustment bolt upper end is connected with sample bench, and worktable upper surface is located in the lower end; The sample bench upper surface also is provided with level meter.
The material of described probe and sample bench is a stainless steel.
The material of described anchor clamps and worktable is a teflon.
The path decision table comprises power supply, resistance and galvanometer, and positive source is connected with resistance, galvanometer respectively, and is connected with milscale by lead, and power cathode is connected with sample bench by lead; Also be provided with pointer in the galvanometer.
In technique scheme, welded tube of the present utility model weld metal zone guttering corrosion depth measurement device comprises: milscale, comprise micrometric screw and probe, and probe is located at the bottom of micrometric screw, and is connected and fixed with micrometric screw; The lifting clamping part comprises worktable, slide bar and anchor clamps, and slide bar is located on the worktable, lower end and worktable vertical fixing; Anchor clamps are located on the slide bar, and an end is connected with slide bar, and the other end clamps with milscale and is connected; Sample bench is located at worktable upper surface; The path decision table, input, output terminal are respectively equipped with lead, and are connected respectively to milscale and sample bench by lead.This measurement mechanism is simple in structure, easy to use, by the direct reading of milscale, measurement data and can be carried out multimetering accurately and reliably as required, data are more accurate; And simple to operate, need not the professional, shortened measuring period greatly; In addition, this measurement mechanism is cheap, has both saved measurement expense, but also has increased economic effect.
Description of drawings
Fig. 1 is the structural representation of welded tube of the present utility model weld metal zone guttering corrosion depth measurement device;
Fig. 2 is the A portion structure for amplifying synoptic diagram of measurement mechanism shown in Figure 1;
Fig. 3 is the circuit theory diagrams of the path decision table of measurement mechanism of the present utility model.
Embodiment
Further specify the technical solution of the utility model below in conjunction with drawings and Examples.
See also shown in Figure 1, welded tube of the present utility model weld metal zone guttering corrosion depth measurement device 10 comprises milscale 11, lifting clamping part 12, sample bench 13 and path decision table 14, milscale 11 can adopt standard machinery milscale or digimatic micrometer commonly used at present, just the measurement anvil and the frame part (not shown) of milscale 11 is removed.Like this, milscale 11 comprises micrometric screw 111, vernier adjustment knob 112, knob 113 and scale 114, see also shown in Figure 2, the bottom center of micrometric screw 111 has circular hole 115, these circular hole 115 diameters are 1～1.5mm, the degree of depth is 3～5mm, and to have an internal diameter at the radial surface of distance micrometric screw 111 bottoms 1.5～3mm be 1～1.5mm screw (not shown), and this screw is connected with circular hole 115 and communicates.This milscale 11 also comprises probe 116, and the material of probe 116 is a stainless steel, because the width range of welded tube weld metal zone erosion grooves is generally at 0.20～1.00mm, depth range is at 0.01～1.00mm, small-sized, therefore, the diameter value of probe 116 is 0.05～0.5mm.Vertically insert in the circular hole 115 probe 116 upper ends, and pass screw and probe 116 holds out against by puller bolt 117, and probe 116 is fixed on the bottom of micrometric screw 111, and circular hole 115 and is vertically downward stretched out in probe 116 lower ends.Please again in conjunction with shown in Figure 1, lifting clamping part 12 comprises worktable 121, slide bar 122 and anchor clamps 123, and the material of worktable 121 is a teflon, and upper surface is smooth, smooth.Slide bar 122 is located on the worktable 121, lower end and worktable 121 vertical fixing; The material of anchor clamps 123 also is a teflon, the left end of anchor clamps 123 is clamped milscale 11, and be fixedly clamped by set bolt 124 and milscale 11, the right-hand member of anchor clamps 123 has vertical circular hole (not shown), by circle hole sleeve on slide bar 122, and can on slide bar 122, carry out upper and lower move, and hold out against by puller bolt 117 and slide bar 122 fixing, thereby can adjust the height of milscale 11 according to the true altitude of sample.Sample bench 13 is located on the worktable 121, and the material of sample bench 13 is a stainless steel, and sample bench 13 upper surfaces are also smooth, smooth, and the bottom is provided with horizontal adjustment bolt 131.Sample bench 13 shown in Fig. 1 is a rectangular parallelepiped, and four jiaos of the bottom are respectively equipped with a horizontal adjustment bolt 131, and horizontal adjustment bolt 131 upper ends are connected with sample bench 13, and worktable 121 upper surfaces are located in the lower end; Sample bench 13 upper surfaces also are provided with an air-bubble level 132, measure and adjustment horizontal adjustment bolt 131 by this level meter 132, make sample bench 13 upper surface maintenance levels.Please in conjunction with shown in Figure 3, path decision table 14 comprises power supply 141, resistance 142 and galvanometer 143, power supply 141 positive poles are connected with resistance 142, galvanometer 143 respectively, and be connected with milscale 11 upper ends by lead 15, power supply 141 negative poles are connected with sample bench 13 by lead 15, this lead 15 appearances insulation.
During measurement, to adopt mechanical milscale is example, earlier milscale 11 is fixed on a suitable elemental height by anchor clamps 123, rotate the knob 113 and the vernier adjustment knob 112 of milscale 11 then, with micrometric screw 111 downward modulations, and sight clear line decision table 14, because probe 116 and sample bench 13 are stainless steel, and milscale 11 also is a metal, be conductive material, when pointer 144 (see figure 1)s of the galvanometer 143 of path decision table 14 deflect, path decision table 14 and milscale 11 then are described, sample bench 13 conducting forms the loop, and promptly the probe 116 of micrometric screw 111 contacts with sample bench 13 is just in time vertical, and (as if what adopt is digimatic micrometer to note milscale 11 scales 114 shown initial reading h1 this moment, then directly zeroing gets final product, i.e. h1=0); Then micrometric screw 111 is raised, and will be located on the sample bench 13 without the welded tube sample (not shown) of galvanochemistry constant potential polarization test, and make probe 116 registration coupon weld metal zone grooves, this moment is again with micrometric screw 111 downward modulations, and sight clear line decision table 14, when pointer 144 deflects, illustrate that probe 116 just in time touches sample weld metal zone channel bottom, noting the shown reading h2 of milscale 11 scales 114 this moment, is h2-h1 by calculating the original depth that can draw sample weld metal zone groove; Then sample is carried out the test of galvanochemistry constant potential polarization, and calculate the average corrosion depth d1 of sample by the weight loss of sample, then the sample behind the electro-chemical test is located on the sample bench 13 once more, adopt 10 pairs of these sample weld metal zone channel bottoms of this measurement mechanism to measure once more, and note the shown reading h3 of milscale 11 scales 114, at this moment, by calculating the actual grade that just can draw sample weld metal zone erosion grooves is d2 '=h3-h2-h1, and then just can try to achieve guttering corrosion sensitivity coefficient α=d2 '/d1.Need to prove at this, in the process of actual measurement h2, h3, because the weld metal zone groove of sample presents uneven usually, probe 116 can not once just in time contact with the bottommost of sample groove, therefore can judge by range estimation, and the adjustment sample, probe 116 can be contacted with the bottommost of sample groove; In addition can also be by this sample groove be carried out multimetering, and will record reading and compare, finally draw the most accurate h2, h3 numerical value, thereby guaranteed measuring accuracy.
Adopt this measurement mechanism 10 to carry out the guttering corrosion depth survey of welded tube weld metal zone, measuring accuracy height, speed are fast, originally the measurement of finishing a point of sample needs 1 hour at least, the measurement of finishing a plurality of points of sample now only needs 1 minute, make shorten greatly measuring period, and need not the professional, operate very simple; In addition, the cost of this measurement mechanism 10 is no more than 400 yuan, and measurement need not other any expenses at every turn, has both reduced cost, has improved economic benefit again.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.
Claims (7)
1. a welded tube weld metal zone guttering corrosion depth measurement device is characterized in that,
This measurement mechanism comprises:
Milscale comprises micrometric screw and probe, and probe is located at the bottom of micrometric screw, and is connected and fixed with micrometric screw;
The lifting clamping part comprises worktable, slide bar and anchor clamps, and slide bar is located on the worktable, lower end and worktable vertical fixing; Anchor clamps are located on the slide bar, and an end is connected with slide bar, and the other end clamps with milscale and is connected;
Sample bench is located at worktable upper surface;
The path decision table, input, output terminal are respectively equipped with lead, and are connected respectively to milscale and sample bench by lead.
2. welded tube as claimed in claim 1 weld metal zone guttering corrosion depth measurement device is characterized in that:
Described micrometric screw bottom center has circular hole, and described probe one end is located in the circular hole; The micrometric screw radial surface also has screw, and communicates with circular hole, passes screw and probe holds out against and fixing by puller bolt.
3. welded tube as claimed in claim 1 weld metal zone guttering corrosion depth measurement device is characterized in that:
Described anchor clamps one end is provided with circular hole, on slide bar, and holds out against fixingly by puller bolt and slide bar by circle hole sleeve, and the anchor clamps other end is clamped milscale, and is fixedly clamped by set bolt and milscale.
4. welded tube as claimed in claim 1 weld metal zone guttering corrosion depth measurement device is characterized in that:
Described sample bench bottom is provided with horizontal adjustment bolt, and the horizontal adjustment bolt upper end is connected with sample bench, and worktable upper surface is located in the lower end; The sample bench upper surface also is provided with level meter.
5. as claim 1 or 2 or 4 described welded tube weld metal zone guttering corrosion depth measurement devices, it is characterized in that:
The material of described probe and sample bench is a stainless steel.
6. as claim 1 or 3 or 4 described welded tube weld metal zone guttering corrosion depth measurement devices, it is characterized in that:
The material of described anchor clamps and worktable is a teflon.
7. welded tube as claimed in claim 1 weld metal zone guttering corrosion depth measurement device is characterized in that:
Described path decision table comprises power supply, resistance and galvanometer, and positive source is connected with resistance, galvanometer respectively, and is connected with milscale by lead, and power cathode is connected with sample bench by lead; Also be provided with pointer in the galvanometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200726184U CN201069428Y (en) | 2007-07-19 | 2007-07-19 | Measuring device for groove erosion depth in the welding pipe welding slot area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200726184U CN201069428Y (en) | 2007-07-19 | 2007-07-19 | Measuring device for groove erosion depth in the welding pipe welding slot area |
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| Publication Number | Publication Date |
|---|---|
| CN201069428Y true CN201069428Y (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200726184U Expired - Fee Related CN201069428Y (en) | 2007-07-19 | 2007-07-19 | Measuring device for groove erosion depth in the welding pipe welding slot area |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608995B (en) * | 2008-06-20 | 2012-01-11 | 宝山钢铁股份有限公司 | Method for testing electrochemical corrosion of welded pipe seam in high-stress state and sample of welded pipe seam |
| CN101726455B (en) * | 2008-10-29 | 2012-04-25 | 宝山钢铁股份有限公司 | Method for rapidly evaluating corrosion susceptibility of trenches of welded pipes by adopting additional constant current |
| CN103323387A (en) * | 2013-06-25 | 2013-09-25 | 沈阳建筑大学 | Electro-chemical corrosion simulator with in-situ loading |
| CN104913802A (en) * | 2015-06-17 | 2015-09-16 | 核工业理化工程研究院 | Test-used marker |
| CN104931131A (en) * | 2015-06-17 | 2015-09-23 | 核工业理化工程研究院 | Test sensor bracket |
| CN105021111A (en) * | 2014-07-18 | 2015-11-04 | 国家电网公司 | Detection-facilitated grounding bar buried depth detector |
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2007
- 2007-07-19 CN CNU2007200726184U patent/CN201069428Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608995B (en) * | 2008-06-20 | 2012-01-11 | 宝山钢铁股份有限公司 | Method for testing electrochemical corrosion of welded pipe seam in high-stress state and sample of welded pipe seam |
| CN101726455B (en) * | 2008-10-29 | 2012-04-25 | 宝山钢铁股份有限公司 | Method for rapidly evaluating corrosion susceptibility of trenches of welded pipes by adopting additional constant current |
| CN103323387A (en) * | 2013-06-25 | 2013-09-25 | 沈阳建筑大学 | Electro-chemical corrosion simulator with in-situ loading |
| CN105021111A (en) * | 2014-07-18 | 2015-11-04 | 国家电网公司 | Detection-facilitated grounding bar buried depth detector |
| CN105180797A (en) * | 2014-07-18 | 2015-12-23 | 国家电网公司 | Grounding bar burial depth detector enabling fast and intuitive detection |
| CN104913802A (en) * | 2015-06-17 | 2015-09-16 | 核工业理化工程研究院 | Test-used marker |
| CN104931131A (en) * | 2015-06-17 | 2015-09-23 | 核工业理化工程研究院 | Test sensor bracket |
| CN104913802B (en) * | 2015-06-17 | 2017-06-13 | 核工业理化工程研究院 | Experiment marking device |
| CN104931131B (en) * | 2015-06-17 | 2017-12-15 | 核工业理化工程研究院 | Test sensor support |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080604 Termination date: 20150719 |
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| EXPY | Termination of patent right or utility model |