CN104897320A - Method for measuring welding residual stress - Google Patents
Method for measuring welding residual stress Download PDFInfo
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- CN104897320A CN104897320A CN201510332110.2A CN201510332110A CN104897320A CN 104897320 A CN104897320 A CN 104897320A CN 201510332110 A CN201510332110 A CN 201510332110A CN 104897320 A CN104897320 A CN 104897320A
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- foil gauge
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Abstract
The invention discloses a method for measuring welding residual stress and relates to the technical field of welding. The method comprises the following steps of: selecting a welding line and a long strip-shaped area on the top surface of a plate subjected to butt welding as a part to be measured of the plate and polishing the part to be measured until the surface of the part to be measured is smooth, wherein the long strip-shaped area is on a side of the welding line and vertical the welding line; pasting foil gauges on at least 5 measuring points selected on the part to be measured on the welding line and the part to be measured on the long strip-shaped area, wherein the foil gages on the welding line are arranged at equal intervals and the foil gages in the long strip-shaped area are gradually dense towards the direction of the welding direction; after the leads of the foil gages and the wire of a strain gage are welded, zeroing the strain gage and checking the change of the resistance values of the foil gages; drilling blind holes on the centers of the foil gages by using a drilling tool, wherein the diameters of the blind holes are from 1.5 to 2mm and the depths of the blind holes are from 2 to 2.5mm; and recording the residual stress data. Compared with a method in the prior art, the method in the invention is accurate in measurement, convenient in operation, and low in cost.
Description
Technical field
The present invention relates to welding technology field, especially a kind of measuring method of welding residual stress.
Background technology
Welding residual stress is after welding terminates, and remain in the stress in cooling weldment, this unrelieved stress is the stress being present in weldment inside with equilibrium state, and its generation causes because weld heating produces uneven temperature field.Welding residual stress is prevalent in welded structure, and the rigidity of its butt-welding fitting, intensity, dimensional stability, stress corrosion crack all have considerable influence.The distribution of the welding residual stress on weldment is very complicated, Measuring Welding Residual Stresses, to guaranteeing that the safety and reliability of workpiece has very important meaning.The measuring method of existing unrelieved stress includes the mechanical measurement method of damage and undamaged physical measurement method, but existing mechanical measuring means exists measures inaccurate problem.
Summary of the invention
The object of this invention is to provide a kind of measuring method of welding residual stress, there is the inaccurate problem of measurement in the mechanical measuring means that this method can solve existing welding residual stress.
In order to solve the problem, the technical solution used in the present invention is: the measuring method of this welding residual stress comprises the following steps:
A, dull and stereotyped upper surface in jam welding, choose weld seam and be positioned at weld seam side and perpendicular to the stripe region of weld seam as the detected part of pieces of cloth, with sand paper by detected part polishing to surface-brightening;
B, all select at least 5 measuring points to paste foil gauges, the foil gauge equidistant placement on weld seam in the detected part of weld seam and the detected part of described stripe region, the foil gauge in described stripe region is intensive gradually towards bead direction;
C, by after fixing with strainmeter wire bonds for foil gauge lead-in wire, strainmeter returned to zero, checks foil gauge change in resistance situation with multimeter;
D, get blind hole with drilling tool at foil gauge center, blind hole diameter is 1.5 ~ 2mm, and blind hole depth is 2 ~ 2.5mm;
E, record unrelieved stress data.
In the technical scheme of the measuring method of above-mentioned welding residual stress, technical scheme can also be more specifically: in step B, and the spacing of pasting foil gauge is in welded joints 25mm, and the spacing of the foil gauge in described stripe region is 15 ~ 30mm.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: measure accurately, easy to operate, cost is low.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1
The measuring method of the welding residual stress of the present embodiment comprises the following steps:
A, dull and stereotyped upper surface in jam welding, choose weld seam and be positioned at weld seam side and perpendicular to the stripe region of weld seam as the detected part of pieces of cloth, with sand paper by detected part polishing to surface-brightening;
B, all select 5 measuring points to paste foil gauges, the foil gauge equidistant placement on weld seam in the detected part of weld seam and the detected part of described stripe region, the foil gauge in described stripe region is intensive gradually towards bead direction; The spacing of pasting foil gauge is in welded joints 25mm, and the spacing of the foil gauge in described stripe region is outwards followed successively by 15mm, 15mm, 20mm, 25mm from weld seam;
C, by after fixing with strainmeter wire bonds for foil gauge lead-in wire, strainmeter returned to zero, checks foil gauge change in resistance situation with multimeter;
D, get blind hole with drilling tool at foil gauge center, blind hole diameter is 1.5mm, and blind hole depth is 2mm;
E, record unrelieved stress data.
Embodiment 2
A, dull and stereotyped upper surface in jam welding, choose weld seam and be positioned at weld seam side and perpendicular to the stripe region of weld seam as the detected part of pieces of cloth, with sand paper by detected part polishing to surface-brightening;
B, all select 6 measuring points to paste foil gauges, the foil gauge equidistant placement on weld seam in the detected part of weld seam and the detected part of described stripe region, the foil gauge in described stripe region is intensive gradually towards bead direction; The spacing of pasting foil gauge is in welded joints 25mm, and the spacing of the foil gauge in described stripe region is outwards followed successively by 15mm, 15mm, 20mm, 25mm, 30mm from weld seam;
C, by after fixing with strainmeter wire bonds for foil gauge lead-in wire, strainmeter returned to zero, checks foil gauge change in resistance situation with multimeter;
D, get blind hole with drilling tool at foil gauge center, blind hole diameter is 2mm, and blind hole depth is 2.5mm;
E, record unrelieved stress data.
Claims (2)
1. a measuring method for welding residual stress, is characterized in that comprising the following steps:
A, dull and stereotyped upper surface in jam welding, choose weld seam and be positioned at weld seam side and perpendicular to the stripe region of weld seam as the detected part of pieces of cloth, with sand paper by detected part polishing to surface-brightening;
B, all select at least 5 measuring points to paste foil gauges, the foil gauge equidistant placement on weld seam in the detected part of weld seam and the detected part of described stripe region, the foil gauge in described stripe region is intensive gradually towards bead direction;
C, by after fixing with strainmeter wire bonds for foil gauge lead-in wire, strainmeter returned to zero, checks foil gauge change in resistance situation with multimeter;
D, get blind hole with drilling tool at foil gauge center, blind hole diameter is 1.5 ~ 2mm, and blind hole depth is 2 ~ 2.5mm;
E, record unrelieved stress data.
2. the measuring method of welding residual stress according to claim 1, is characterized in that: in step B, and the spacing of pasting foil gauge is in welded joints 25mm, and the spacing of the foil gauge in described stripe region is 15 ~ 30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510332110.2A CN104897320A (en) | 2015-06-16 | 2015-06-16 | Method for measuring welding residual stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510332110.2A CN104897320A (en) | 2015-06-16 | 2015-06-16 | Method for measuring welding residual stress |
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| CN104897320A true CN104897320A (en) | 2015-09-09 |
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| CN201510332110.2A Pending CN104897320A (en) | 2015-06-16 | 2015-06-16 | Method for measuring welding residual stress |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203625A (en) * | 2015-09-11 | 2015-12-30 | 中国特种设备检测研究院 | Magnetic evaluation method for residual stress relieving effect in postweld heat treatment |
| CN107009041A (en) * | 2017-03-22 | 2017-08-04 | 山西汾西重工有限责任公司 | The flat welding process of extra super duralumin alloy circular cylindrical shell and rust-preventing aluminum alloy circular cylindrical shell |
| CN107991457A (en) * | 2018-01-24 | 2018-05-04 | 天津职业技术师范大学 | A kind of method predicted based on structural transformation welding residual stress and control device |
| CN109307568A (en) * | 2018-11-16 | 2019-02-05 | 北京理工大学 | The lossless detection method of welding residual stress and the probe for using this method |
| CN110625211A (en) * | 2019-08-13 | 2019-12-31 | 桂林电子科技大学 | System and method for measuring cooling stress of welding spot after reflow soldering |
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| JPS57175233A (en) * | 1981-04-21 | 1982-10-28 | Toshiba Corp | Measuring method of residual stress |
| CN101900615A (en) * | 2009-05-27 | 2010-12-01 | 中国石油天然气集团公司 | Blind hole measurement method for value and distribution of residual stress of thick-wall and large-diameter welded steel pipe |
| CN102853952A (en) * | 2012-09-18 | 2013-01-02 | 哈尔滨电机厂有限责任公司 | Method for testing welding residual stress of mixed-flow turning wheel |
| CN103808438A (en) * | 2014-01-16 | 2014-05-21 | 浙江工业大学 | Method for measuring sheet welding residual stress |
| CN104296901A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Welding residual stress small hole measuring method |
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2015
- 2015-06-16 CN CN201510332110.2A patent/CN104897320A/en active Pending
Patent Citations (5)
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| JPS57175233A (en) * | 1981-04-21 | 1982-10-28 | Toshiba Corp | Measuring method of residual stress |
| CN101900615A (en) * | 2009-05-27 | 2010-12-01 | 中国石油天然气集团公司 | Blind hole measurement method for value and distribution of residual stress of thick-wall and large-diameter welded steel pipe |
| CN102853952A (en) * | 2012-09-18 | 2013-01-02 | 哈尔滨电机厂有限责任公司 | Method for testing welding residual stress of mixed-flow turning wheel |
| CN103808438A (en) * | 2014-01-16 | 2014-05-21 | 浙江工业大学 | Method for measuring sheet welding residual stress |
| CN104296901A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Welding residual stress small hole measuring method |
Non-Patent Citations (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203625A (en) * | 2015-09-11 | 2015-12-30 | 中国特种设备检测研究院 | Magnetic evaluation method for residual stress relieving effect in postweld heat treatment |
| CN105203625B (en) * | 2015-09-11 | 2018-12-04 | 中国特种设备检测研究院 | The magnetic evaluation method of post weld heat treatment elimination residual stress effect |
| CN107009041A (en) * | 2017-03-22 | 2017-08-04 | 山西汾西重工有限责任公司 | The flat welding process of extra super duralumin alloy circular cylindrical shell and rust-preventing aluminum alloy circular cylindrical shell |
| CN107991457A (en) * | 2018-01-24 | 2018-05-04 | 天津职业技术师范大学 | A kind of method predicted based on structural transformation welding residual stress and control device |
| CN109307568A (en) * | 2018-11-16 | 2019-02-05 | 北京理工大学 | The lossless detection method of welding residual stress and the probe for using this method |
| CN110625211A (en) * | 2019-08-13 | 2019-12-31 | 桂林电子科技大学 | System and method for measuring cooling stress of welding spot after reflow soldering |
| CN110625211B (en) * | 2019-08-13 | 2021-09-10 | 桂林电子科技大学 | System and method for measuring cooling stress of welding spot after reflow soldering |
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Application publication date: 20150909 |
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