CN105352964A - Method for measuring heat affected zone of welded joint - Google Patents
Method for measuring heat affected zone of welded joint Download PDFInfo
- Publication number
- CN105352964A CN105352964A CN201510900761.7A CN201510900761A CN105352964A CN 105352964 A CN105352964 A CN 105352964A CN 201510900761 A CN201510900761 A CN 201510900761A CN 105352964 A CN105352964 A CN 105352964A
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- affected zone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a method for measuring a heat affected zone of a welded joint. Sample preparation is conducted firstly; then the section of a sample is polished, metallographic analysis is conducted, and a first border line between the heat affected zone and the welded joint and a second border line between base metal and the heat affected zone are determined; a base line OA is determined with the point of interaction O of the center line of the thickness of the sample and the first border line as the base point; Vickers hardness is tested from the point of interaction O in sequence along the base line OA till Vickers hardness does not change, and the actual point of interaction of the base line and the second border line is determined; the linear distance of the base line is measured, and the maximum width of the heat affected zone is calculated. By the adoption of the method, the maximum width of the heat affected zone can be accurately measured after welding of an armored plate, and finally the effective protection area of the armored plate is obtained.
Description
Technical field
The invention belongs to physico-chemical examination technique field, relate to a kind of measuring method of welding joint heat-affected zone.
Background technology
When measuring the effective protected area of armour plate, need the area removing heat-affected zone, and GB/T2654-2008 " welding joint hardness test method ", it is a kind of method that butt joint carries out measuring hardness, specify that the hardness measurement method in the various scopes of butt junction, but the measurement of heat-affected zone (HAZ) width is but specified, due to the irregularity boundary of heat-affected zone, accurately cannot measure the breadth extreme of the HAZ of armour plate postwelding.
Summary of the invention
The object of the invention is the measuring method proposing a kind of welding joint heat-affected zone, solve the problem that weldment welding joint heat-affected zone width cannot be measured.
Technical scheme of the present invention is: a kind of measuring method of welding joint heat-affected zone, is characterized in that: specifically comprise the following steps:
Step one, sample preparation: cut sample perpendicular to welding joint, and liquid coolant is added to two cross sections of sample process;
Step 2, polishing is carried out to specimen cross section, and do metallographic examination, determine the second boundary line between the monophase field of the first boundary line between the coexistence region in heat-affected zone and the monophase field of weld seam and mother metal and the coexistence region in heat-affected zone respectively; Using the intersection point O of the center line of sample thickness and the first boundary line as basic point determination baseline OA, the centerlines of baseline OA and sample thickness is 90 ° of-α, and wherein, α is groove angle, and A is the intersection point of baseline and the second boundary line;
Step 3, from intersection point O, beat Vickers hardness successively along the direction of baseline OA, until stop when Vickers hardness no longer changes, now determine the actual intersection point that first A ' that Vickers hardness no longer changes is baseline and the second boundary line;
The air line distance of step 4, measurement OA ', the breadth extreme OB calculating heat-affected zone is: OA ' cos α value; The line place straight line of A ' B is the critical line of heat-affected zone and mother metal;
Step 5, effective zone of protection according to critical line determination armour plate.
Beneficial effect: the present invention accurately can measure the breadth extreme in the heat-affected zone after armor welding, finally obtains effective zone of protection of armour plate.
Accompanying drawing explanation
Fig. 1 is weld groove figure;
Fig. 2 is baseline division figure of the present invention.
Wherein: 1-mother metal, 2-heat-affected zone, 3-weld seam
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Mother metal 1, as armor weld time, stainless steel welding stick or welding rod is adopted to weld, welded seam area is the weakness zone of this armor, the transition tissue being organized as martensite-austenite of heat-affected zone 2, weld seam 3 be organized as single phase austenite tissue, armour plate body be organized as tempered martensite.
The measuring method in welding joint heat-affected zone of the present invention, specifically comprises the following steps:
Step one, sample preparation: according to the requirement of GB/T2654-2008 " welding joint hardness test method ", cut the sample of regulation perpendicular to welding joint, and liquid coolant is added to two cross sections of sample process, make processing rear surface roughness reach requirement, be at least Ra0.2, guarantee grinding tolerance;
Step 2, polishing is carried out to specimen cross section, and do metallographic examination, determine the second boundary line between the monophase field of the first boundary line between the coexistence region in heat-affected zone and the monophase field of weld seam and mother metal and the coexistence region in heat-affected zone respectively; It is 60 degree for weld groove α, using the intersection point O of the center line of sample thickness and the first boundary line as basic point determination baseline OA, centerlines 90 ° of-α of baseline OA and sample thickness, are 30 ° herein, A is the intersection point of baseline and the second boundary line, ensure that OA is nose section;
Step 3, from intersection point O, beat Vickers hardness (HV5) successively along the direction of baseline OA, Vickers hardness changes always, until Vickers hardness no longer changes, illustrate and arrive the monophase field of mother metal, now determine the actual intersection point that first A ' that Vickers hardness no longer changes is baseline and the second boundary line;
The air line distance of step 4, measurement OA ', the breadth extreme OB calculating heat-affected zone is: OA ' cos α value; The line place straight line of A ' B is the critical line of heat-affected zone and mother metal; OA ' and the angle of OB are the vertical A ' B of α, OB.
Step 5, effective zone of protection of armour plate can be determined according to critical line.
The present invention can measure the heat-affected zone of welding joint effectively accurately, makes effective calculating to the size of armour plate zone of protection.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. the measuring method in welding joint heat-affected zone, is characterized in that: specifically comprise the following steps:
Step one, sample preparation: cut sample perpendicular to welding joint, and liquid coolant is added to two cross sections of sample process;
Step 2, polishing is carried out to specimen cross section, and do metallographic examination, determine the second boundary line between the monophase field of the first boundary line between the coexistence region in heat-affected zone and the monophase field of weld seam and mother metal and the coexistence region in heat-affected zone respectively; Using the intersection point O of the center line of sample thickness and the first boundary line as basic point determination baseline OA, the centerlines of baseline OA and sample thickness is 90 ° of-α, and wherein, α is groove angle, and A is the intersection point of baseline and the second boundary line;
Step 3, from intersection point O, beat Vickers hardness successively along the direction of baseline OA, until stop when Vickers hardness no longer changes, now determine the actual intersection point that first A ' that Vickers hardness no longer changes is baseline and the second boundary line;
The air line distance of step 4, measurement OA ', the breadth extreme OB calculating heat-affected zone is: OA ' cos α value; The line place straight line of A ' B is the critical line of heat-affected zone and mother metal;
Step 5, effective zone of protection according to critical line determination armour plate.
2. the measuring method in a kind of welding joint heat-affected zone according to claim 1, is characterized in that: in step one, and the surfaceness after sample processing is at least Ra0.2, guarantees grinding tolerance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510900761.7A CN105352964B (en) | 2015-12-08 | 2015-12-08 | A kind of measuring method in welding point heat-affected zone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510900761.7A CN105352964B (en) | 2015-12-08 | 2015-12-08 | A kind of measuring method in welding point heat-affected zone |
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| Publication Number | Publication Date |
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| CN105352964A true CN105352964A (en) | 2016-02-24 |
| CN105352964B CN105352964B (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510900761.7A Active CN105352964B (en) | 2015-12-08 | 2015-12-08 | A kind of measuring method in welding point heat-affected zone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162078A (en) * | 2020-09-23 | 2021-01-01 | 西安热工研究院有限公司 | On-site detection method for repair welding area of outer surface of high-temperature and high-pressure pipe fitting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095654A (en) * | 2010-11-04 | 2011-06-15 | 西北工业大学 | Method for measuring distribution of microhardness of welded pipe |
| CN102419290A (en) * | 2011-12-12 | 2012-04-18 | 敦化市拜特科技有限公司 | Method for judging laser welding strength of heat-treatment-improved martensitic aged steel belt |
| CN103870679A (en) * | 2014-02-24 | 2014-06-18 | 苏州热工研究院有限公司 | Judgment method for minimum inserting section size in Charpy impact test sample recombination technology |
| EP2883643A1 (en) * | 2012-08-09 | 2015-06-17 | JFE Steel Corporation | Submerged arc welding method, weld joint formed by the welding method, and steel pipe or tube having the weld joint |
| CN104849144A (en) * | 2015-05-26 | 2015-08-19 | 山东大学 | Method for detecting strain strengthening non-homogeneous deformation of stainless steel welded joint |
| CN105382437A (en) * | 2014-08-21 | 2016-03-09 | Posco公司 | Welded joint with excellent impact toughness and manufacturing method thereof |
-
2015
- 2015-12-08 CN CN201510900761.7A patent/CN105352964B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095654A (en) * | 2010-11-04 | 2011-06-15 | 西北工业大学 | Method for measuring distribution of microhardness of welded pipe |
| CN102419290A (en) * | 2011-12-12 | 2012-04-18 | 敦化市拜特科技有限公司 | Method for judging laser welding strength of heat-treatment-improved martensitic aged steel belt |
| EP2883643A1 (en) * | 2012-08-09 | 2015-06-17 | JFE Steel Corporation | Submerged arc welding method, weld joint formed by the welding method, and steel pipe or tube having the weld joint |
| CN103870679A (en) * | 2014-02-24 | 2014-06-18 | 苏州热工研究院有限公司 | Judgment method for minimum inserting section size in Charpy impact test sample recombination technology |
| CN105382437A (en) * | 2014-08-21 | 2016-03-09 | Posco公司 | Welded joint with excellent impact toughness and manufacturing method thereof |
| CN104849144A (en) * | 2015-05-26 | 2015-08-19 | 山东大学 | Method for detecting strain strengthening non-homogeneous deformation of stainless steel welded joint |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162078A (en) * | 2020-09-23 | 2021-01-01 | 西安热工研究院有限公司 | On-site detection method for repair welding area of outer surface of high-temperature and high-pressure pipe fitting |
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| CN105352964B (en) | 2018-05-08 |
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