KR20160147151A - Estimation for welding joint of ultra high input welding - Google Patents
Estimation for welding joint of ultra high input welding Download PDFInfo
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- KR20160147151A KR20160147151A KR1020150083240A KR20150083240A KR20160147151A KR 20160147151 A KR20160147151 A KR 20160147151A KR 1020150083240 A KR1020150083240 A KR 1020150083240A KR 20150083240 A KR20150083240 A KR 20150083240A KR 20160147151 A KR20160147151 A KR 20160147151A
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- welded joint
- boron
- point
- steel plate
- comparison
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2255—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident ion beams, e.g. proton beams
- G01N23/2258—Measuring secondary ion emission, e.g. secondary ion mass spectrometry [SIMS]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/07—Investigating materials by wave or particle radiation secondary emission
- G01N2223/079—Investigating materials by wave or particle radiation secondary emission incident electron beam and measuring excited X-rays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/629—Specific applications or type of materials welds, bonds, sealing compounds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/631—Specific applications or type of materials large structures, walls
Abstract
Description
The present invention relates to a method of evaluating a superheated heat welded joint, and more particularly, to a method of evaluating a superheated heat welded joint to determine the suitability of a superheated heat welded joint by confirming the distribution of boron.
Structures in various fields such as ships, buildings, and offshore structures are generally constructed by joining steel materials by welding. From the viewpoint of ensuring safety, the steel materials used in such structures are not limited to steel strength, Good toughness is required.
In recent years, along with the enlargement of the size of the welded structure, from the viewpoint of improvement of the construction efficiency of the structure and reduction of the construction cost, improvement of the welding construction efficiency is required and the increase of the heat input of the welding is aimed. Particularly, it is developed and applied to improve the productivity, which is excellent in characteristics of super heat-affected heat affected by heat input of about 570 ~ 640kJ / cm on 80t basis.
Applying the ultra-strong Tantem Electro Gas Welding to the general TMPC Plate, the formation of coarse grain boundary structure and weak ferrite side plate and Upper Bainite structure, There arises a problem that the toughness at the temperature is significantly lowered. In order to solve the problem of deterioration of the base plate material by Tantemoelectro-gas welding, related steel manufacturers have actively studied the microstructure control of the heat affected part by the welding heat welding.
In order to develop new types of new steels, vacuum melting, rolling, welding part simulation evaluation and test analysis of many conditions of pilot stage are carried out prior to utilization of on-site mass production facilities.
However, in the welding part simulation evaluation stage, it is required that the target heat amount is determined according to the thickness of the steel sheet to be 80t in the characteristic of the electro arc welding. This is because the ingot size of the vacuum melting material is limited. Conventionally, the impact test is performed by predicting the structure by the heat affected portion simulation test, but it is often different from the actual impact test result after the welding.
In addition, the pilot rolling mill was not able to evaluate the weldability of the superheated Tandem EGW of 600 kJ / cm due to the small size, the lack of thickness and the flatness problem, and indirectly, the heat input test by Gleeve, MTCS, Has been utilized. However, the impact test results of the simulated heat affected zone are different from those of the actual welded parts, and the changes in the structure and toughness due to the diffusion phenomenon of the welded material are neglected.
The present invention provides a standard for judging the suitability of a super heat welded joint, so that a quick and effective evaluation method for research and development of a steel sheet after being made of a pilot rolling material will be continuously applied. And to provide a method for evaluating an ultra heat welded joint which enables effective development.
According to another aspect of the present invention, there is provided a method of evaluating a welded joint of an ultra heat welded joint according to the present invention, comprising the steps of: forming a welded joint between a steel strip and a welded joint between the welded joint and the welded joint; Welded joint portion,
And evaluating the weldability of the welded joint with a boron distribution of the welded joint at a distance apart from a boundary portion between the welded joint and the welded steel plate.
A method for evaluating a superheated heat welded joint according to the present invention is characterized in that a reference point spaced apart from a boundary portion between the rear steel plate and the welded joint is set to a rear steel plate, And a plurality of comparison points spaced apart from a boundary portion between the steel strip and the welded joint are designated to the welded joint and a boron distribution is confirmed in a region around the comparison point Comparison boron distribution identification process; And comparing the reference boron distribution with the comparative boron distribution to determine the suitability of the welded joint.
The reference boron distribution checking process according to the present invention may set a point within 0.1 mm to 0.7 mm between the rear steel plate and the welded joint as a reference point on the rear steel plate.
The reference point according to the present invention may be 0.5 mm at the boundary between the steel plate and the welded joint.
In the comparative boron distribution checking process according to the present invention, a plurality of comparison points within a range of 0.1 mm to 5 mm between the rear steel plate and the welded joint can be designated to the welded joint.
The comparative boron distribution checking process according to the present invention sets the first comparison point at 0.1 mm or more and 0.3 mm or less at the boundary portion, sets the second comparison point at 0.3 mm or more and 0.7 mm or less, Hereinafter, the third comparison point can be set.
The first comparison point according to the present invention is a point 0.1 mm apart from the boundary portion, the second comparison point is a point 0.5 mm apart from the boundary portion, and the third comparison point is 3 mm apart from the boundary portion Lt; / RTI >
The reference boron distribution checking process and the comparison boron distribution checking process according to the present invention can be confirmed using SIMS (Secondary Ion Mass Spectrometry).
The analysis conditions of SIMS in the reference boron distribution checking process and the comparison boron distribution checking process according to the present invention are O2: 10 to 15 kV, sample voltage: -3 kV to -6 kV, primary ion beam current: 180 nA to 220 nA, : 11 B 16 O 2 , area range: 50 to 150 μm in dia.
If the amount of boron in the region of the first comparison point is 80 to 100% with respect to the boron amount in the region of the reference point, the weld joint may be judged to be good.
If the amount of boron in the region of the second comparison point is 60 to 80% of the boron amount in the region of the reference point, the quality evaluation process according to the present invention can determine that the welded joint is good.
In the present invention, if the amount of boron in the region of the third comparison point is greater than 0 to 20% of the boron amount in the region of the reference point, the weld joint may be determined to be good.
The present invention has the effect of providing a quick and effective evaluation method for research and development of a steel plate after being made of a pilot rolling material by providing a criterion for judging the suitability of the super heat welded joint.
The present invention has the effect of enabling the effective development of a functional steel material such as a superalloy heat-resistant steel material to be continuously expanded.
FIG. 1 is a view showing an example in which a post-steel plate is subjected to electrostatic welding with a superstructure heat strengthening tantam as a post-steel plate using a pilot rolling material
2 is a block diagram showing a method for evaluating a super heat welded joint according to the present invention
FIG. 3 is an enlarged view of a weld joint formed through an electrogas welding installation of a post-steel plate
Fig. 4 is an enlarged view showing the distribution of boron using SIMS at points A to H in Fig. 3
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the detailed description of the present invention, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.
A method for evaluating a superheated heat welded joint according to the present invention is characterized by comprising the steps of: forming a welded joint through a post welded steel plate superstructure heat shielding electrostatic welding process between a steel sheet and evaluating the suitability of the welded joint; to be.
The method for evaluating a superheated welded joint according to the present invention evaluates the weldability of the welded joint with a boron distribution of the welded joint at a distance apart from a boundary portion between the welded joint and the welded joint.
FIG. 1 is a view showing an example in which a steel sheet is subjected to a retrofitting of a steel sheet by a superstructure of a steel sheet, and as shown in FIG. 1, , The steel plate and the welded joint can be evaluated by the evaluation method of the superheated welded joint according to the present invention.
A method of constructing a steel plate by using a pilot laver and a steel plate, the method comprising: forming a steel plate by pressing and milling a piled-up rolled steel sheet;
A step of forming a backing steel sheet by integrally welding the steel sheets after the step of forming the backing steel sheet;
And a step of arranging the base material for welding test and the general TMPC material so as to be spaced apart from each other and then working under one-pass super heat welding conditions.
In the step of forming the rear steel plate, two rear steel plates of 40t are formed. In the step of forming the base metal for welding test, two steel plates are stacked to form 80t after 40t.
In addition, the general TMPC material having the same thickness as that of the base material for welding test, that is, 80t is used.
In the step of forming the base material for welding test, the rear steel sheet is formed by laying 80t, temporarily fixed with a toggle clamp or the like, and then proceeding in a 20-40mm stitch method in which tag welding is possible in consideration of contact cracks. ~ 10 ° Bead Improvement By combining two processed materials, it is secured with end taps and strong bags in a state of being open at a root gap of 6 ~ 10mm and made solid.
The general TMPC material is processed so as to have an angle of 7 to 10 degrees on one side, and the one side having a slope of 7 to 10 degrees in the welding test base material and the one having a slope of 7 to 10 degrees in the general TMPC material A step of operating under one-pass super heat welding conditions is performed in a state in which one side faces each other.
A method for evaluating a welded joint of a welded joint according to the present invention is characterized by evaluating the weldability of the welded joint with a boron distribution of the welded joint at a distance apart from a boundary portion between the welded joint and the welded joint, A reference boron distribution checking step (S100) of setting a reference point spaced apart from a boundary portion of the welded joint to a trailing steel sheet and confirming a boron distribution of the trailing steel sheet within a region around the reference point;
A comparison boron distribution confirmation step (S200) of assigning a plurality of comparison points spaced apart from a boundary portion between the steel plate and the welded joint to the welded joint and confirming a boron distribution in a region around the comparison point; And
And comparing the reference boron distribution with the comparative boron distribution to determine the suitability of the welded joint (S300).
The reference boron distribution checking step S100 sets a point within 0.1 mm to 0.7 mm of the boundary between the rear steel plate and the welded joint as a reference point on the rear steel plate, And is preferably 0.5 mm at the boundary portion of the joint.
In the comparative boron distribution confirmation step (S200), a plurality of comparison points within a range of 0.1 mm to 5 mm at the boundary between the steel strip and the welded joint are designated to the welded joint, and at least 0.1 mm A first comparison point is set at 0.3 mm or less, a second comparison point is set at 0.3 mm or more and 0.7 mm or less, and a third comparison point is set at 2.5 mm or more and 3.5 mm or less.
It is preferable that the first comparison point is a point spaced 0.1 mm from the boundary portion, the second comparison point is a point spaced 0.5 mm from the boundary portion, and the third comparison point is 3 mm apart from the boundary portion Do.
The reference boron distribution checking step (S100) and the comparison boron distribution checking step (S200) are preferably confirmed using SIMS (Secondary Ion Mass Spectrometry).
FIG. 2 is an enlarged photograph showing a weld joint formed through the electroplated welding process of the ultra-pure titanium steel strip in the rear steel plate, and an enlarged photograph showing the distribution of boron using SIMS at points A to H in FIG.
The analysis conditions of the SIMS in the reference boron distribution checking step S100 and the comparison boron distribution checking step S200 are O2: 10 to 15 kV, sample voltage: -3 kV to -6 kV, primary ion beam current: 180 nA to 220 nA, The detection ion: 11 B 16 O 2 , and the region range: 50 to 150 μm in dia.
The point A in FIG. 2 is a point spaced 0.5 mm from the boundary portion to the rear steel plate side, the point B is 0.1 mm away from the boundary portion to the rear steel plate side, and the point A is the reference point.
The point C in FIG. 2 is a point spaced 0.1 mm from the boundary portion toward the welded joint portion, and a point D is a point spaced 0.3 mm from the boundary portion toward the welded joint portion, Is the first comparison point.
2 is a second comparison point at a point spaced 0.5 mm from the boundary portion to the welded joint side, F is a point at 1.5 mm from the boundary portion to the welded joint side, and FIG. 2 The G point is a point spaced 2.0 mm from the boundary portion to the weld joint side, and the H point in Fig. 2 is a point 3 mm apart from the boundary portion to the weld joint side, which is a third comparison point.
If the amount of boron in the region of the first comparison point is 80 to 100% of the boron amount in the region of the reference point, the quality evaluation process (S300) determines that the welded joint is good.
If the amount of boron in the region of the second comparison point is 60 to 80% of the boron amount in the region of the reference point, the quality evaluation process (S300) determines that the welded joint is good.
If the amount of boron in the region of the third comparison point is greater than 0 to 20% of the boron amount in the region of the reference point, the quality evaluation process (S300) determines that the welded joint is good.
The present invention provides a quick and effective evaluation method for research and development of a steel plate made of a pilot rolling material by providing a criterion for judging the suitability of a super heat welded joint.
The present invention enables the effective development of functional steels such as steels for super heat welding which will be continuously expanded.
As described above, an optimal embodiment has been disclosed in the drawings and specification. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention, The scope should be determined by the technical idea of the appended claims.
S100: Determination of standard boron distribution
S200: Comparison Boron Distribution Checking Process
S300: Conformity Assessment Process
Claims (12)
And evaluating the weldability of the welded joint by a boron distribution of the welded joint at a distance apart from a boundary portion between the welded joint and the welded joint.
A reference boron distribution checking step of setting a reference point spaced apart from a boundary portion between the rear steel plate and the welded joint to determine a boron distribution of the rear steel plate within a region around the reference point;
Designating a plurality of comparison points spaced apart from a boundary portion between the rear steel plate and the welded joint to identify the boron distribution within a region around the comparison point; And
And comparing the reference boron distribution with the comparative boron distribution to determine the suitability of the welded joint.
Wherein the reference boron distribution checking step sets a point within a range of 0.1 mm to 0.7 mm between the rear steel plate and the welded joint as a reference point on the rear steel plate.
Wherein the reference point is 0.5 mm at a boundary between the steel plate and the welded joint.
Wherein the comparative boron distribution checking step specifies a plurality of comparison points within the range of 0.1 mm to 5 mm at the boundary between the steel strip and the welded joint to the welded joint.
Wherein the comparative boron distribution checking step sets a first comparison point at a boundary portion of 0.1 mm or more and 0.3 mm or less, sets a second comparison point at 0.3 mm or more and 0.7 mm or less, And the comparison point is set.
The first comparison point is a point spaced 0.1 mm from the boundary part, the second comparison point is 0.5 mm apart from the boundary part, and the third comparison point is 3 mm apart from the boundary part Of the welded joints.
Wherein the reference boron distribution checking step and the comparison boron distribution checking step are confirmed by SIMS (Secondary Ion Mass Spectrometry).
SIMS analysis conditions were O2: 10 to 15 kV, sample voltage: -3 kV to -6 kV, primary ion beam current: 180 nA to 220 nA, detected ions: 11 B 16 O 2 , and the region range is 50 to 150 μm in dia.
Wherein the weld joint is judged to be good if the amount of boron in the region of the first comparison point is 80 to 100% with respect to the boron amount in the region of the reference point.
Wherein the weld joint is judged to be good when the amount of boron in the region of the second comparison point is 60 to 80% of the boron in the region of the reference point.
Wherein the weld joint is judged to be good if the amount of boron in the region of the third comparison point is greater than 0 to 20% of the boron amount in the region of the reference point.
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| KR1020150083240A KR101719136B1 (en) | 2015-06-12 | 2015-06-12 | Estimation for welding joint of ultra high input welding |
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| KR1020150083240A KR101719136B1 (en) | 2015-06-12 | 2015-06-12 | Estimation for welding joint of ultra high input welding |
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| KR20160147151A true KR20160147151A (en) | 2016-12-22 |
| KR101719136B1 KR101719136B1 (en) | 2017-03-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1177323A (en) * | 1997-09-11 | 1999-03-23 | Furukawa Electric Co Ltd:The | Quality monitoring device for resistance welding |
| JPH11287745A (en) * | 1998-03-31 | 1999-10-19 | Nisshin Steel Co Ltd | Method for evaluating junction state of welded part and method for determining weld condition |
| JP2000015474A (en) * | 1998-06-30 | 2000-01-18 | Hitachi Metals Ltd | Inspecting method of weld zone in welded tube |
| KR100591293B1 (en) * | 2005-01-15 | 2006-06-19 | 주식회사 한진중공업 | The method of inverse combined welding using electro gas welding and gas metal arc welding and copper shoe used therefor |
-
2015
- 2015-06-12 KR KR1020150083240A patent/KR101719136B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1177323A (en) * | 1997-09-11 | 1999-03-23 | Furukawa Electric Co Ltd:The | Quality monitoring device for resistance welding |
| JPH11287745A (en) * | 1998-03-31 | 1999-10-19 | Nisshin Steel Co Ltd | Method for evaluating junction state of welded part and method for determining weld condition |
| JP2000015474A (en) * | 1998-06-30 | 2000-01-18 | Hitachi Metals Ltd | Inspecting method of weld zone in welded tube |
| KR100591293B1 (en) * | 2005-01-15 | 2006-06-19 | 주식회사 한진중공업 | The method of inverse combined welding using electro gas welding and gas metal arc welding and copper shoe used therefor |
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| KR101719136B1 (en) | 2017-03-24 |
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