CN101402159B - Device and method for testing weldability for rolled steel for vessel - Google Patents
Device and method for testing weldability for rolled steel for vessel Download PDFInfo
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- CN101402159B CN101402159B CN2008102350589A CN200810235058A CN101402159B CN 101402159 B CN101402159 B CN 101402159B CN 2008102350589 A CN2008102350589 A CN 2008102350589A CN 200810235058 A CN200810235058 A CN 200810235058A CN 101402159 B CN101402159 B CN 101402159B
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Abstract
The invention discloses a test device and a test method for the weldability of ship steel materials, which belong to the technical field of material joining. The test device consists of test plates and reinforcing ribs which are arranged along the width direction of the test plates and are vertically welded with the test plates. The test method comprises the following steps: materials are selected to manufacture the test device first; then the back side of each test plate is pasted with a ceramic backing; preset welding gaps of the test plates are welded according to preset welding variables; and after the welding, the test device is placed for 24 hours at normal temperature, and then a dye detection method is adopted to inspect test welds. The test plates of the test device have large dimensions which are closer to the actual situation than sizes of test plates commonly used by a weldability testing method. The reinforcing ribs stimulate a structure of a ship and have small spacing and large rigidity. The back sides of the test plates of the test device are pasted with the ceramic backings, and the welding gaps can be preset, so the test device can fully and truly simulate the actual situation of the welding of steel plates of the ship, and has the applicability as well as promotion and application value.
Description
Technical field
The invention belongs to metal material interconnection technique field.Relate to the test of steel weldability, more specifically relate to a kind of experimental rig and test method of weldability for rolled steel for vessel.
Background technology
The definition of metal solder is whether metal can adapt to welding processing and form completely, possesses the characteristic of the welding point of certain serviceability.This has the two-layer meaning, and the one, metal material the defective that crackle (cold crack, fire check), pore etc. influence metallic integrity can not occur through after the welding processing.This adopts weldability test to verify usually.The 2nd, metal material is after the process welding processing, and the performance in zones such as weld seam, heat affected area can not have tangible reduction, influence use from now on.This adopts the test of mechanical property to verify usually.
The kind of metal has a lot, and its performance difference is also very big, and the mechanism that produces defective is also different, so every kind of weldability test method all has its applicable scope.Up to now, Welder author both domestic and external is at different materials, and the occasion of different application and the specific weld defective that needs to test have been invented nearly hundred kinds of weldability test methods.Have as weldability test method commonly used: 1) oblique Y type groove welding crack test method; It mainly is applicable to carbon steel and the evaluation of low-alloy high-strength steel welding heat affected zone cold crack sensitiveness.2) implant test; Purposes is an evaluation steel welding heat affected zone cold crack sensitiveness, and this is a quantitative methods, and steel consumption is few, and result of the test is reliable and stable, also can be used for measuring reheat cracking susceptibility and lamellar tearing sensitiveness.3) pressing plate butt joint welding cracking test method (Fisco test); Purposes is an evaluation fire check sensitiveness (being proposed by the Switzerland welding engineer).4) varestraint test method; Purposes is an evaluation fire check sensitiveness (U.S. welding expert Savage1965 proposition).5) rigidly fix butt joint cracking test (the east of Sichuan test); Purposes is the sensitiveness (being proposed by Ukraine's the east of Sichuan institute of welding) of evaluation fire check and cold crack.And tensile restraint cracking test (TRC); Rigid restraint cracking test (RRC); Window shape is restrained cracking test or the like.
Along with the continuous development of shipbuilding technology, the tonnage of shipbuilding also from the sixties in last century maximum ten thousand tons of wheels develop into 500,000 tons of oil tankers of today.The length of its steamer is from tens meters nearly 400 meters of developing into today.This has just brought new problem, and Pacific wave wavelength about 200 meters, is understood jolting of dipping and heaving less than 200 meters ships usually in stormy waves, also have the danger of shipwreck sometimes.When the length of boats and ships during greater than 200 meters jolting of dipping and heaving can alleviate manyly, the security of navigating by water in stormy waves is also higher.But at this moment the build guality to boats and ships has proposed new requirement; because the length of boats and ships is greater than the length of wave; so often having two waves acts on the hull simultaneously; this is exactly typical three-point bending on mechanics; if on stressed maximum point, weld defect is arranged; so just be easy to produce and destroy, cause great accident.The example report that 17.5 ten thousand tons ship one disconnected two halves have been arranged in recent years.The steel that large ship is used, better usually as the weldability of DH32, DH36, adopt the weldability test method of above-mentioned existing routine almost can not test weld defect.But shipyard is found longitudinal crack in the backing weld seam of being everlasting in cut deal structure welding process, also can find transversal crack in the individual very big structure that makes yourself at home, and the position of cracking is fixing, has the crackle on surface that crackle at the following 3-4mm in surface is also arranged.The reason that causes this problem is existing weldability test method, does not have the actual conditions of real simulated shipbuilding.When welding as shipbuilding, ceramic substrate is posted at the back side of steel plate, and reaching the purpose of one side welding with back formation, and all now weldability test methods are not all pasted ceramic substrate.In addition, the welded gaps of all now weldability test methods all is 2～3mm.And the regulation of shipyard is exactly 6mm, and the job site often reaches 10mm, have in addition reach 18mm.The welding current of existing weldability test method is usually at 180～220A, and in fact shipyard is often brought up to 250A to welding current in order to drive plan, even 280A.
Above situation explanation, actual conditions when existing weldability test method can not reflect shipbuilding really, adopt no problem welding material and ship plate behind the existing weldability test method test, when actual shipbuilding still defective can appear, this brings a large amount of reclamation works to manufacturer, and also the safe navigation to boats and ships brings great hidden danger.So the actual conditions that need produce at shipyard again, in conjunction with the custom in the shipyard production, formulate a weldability test method and a soldering test device that meets shipyard production actual conditions, structure, stress, the welded condition of real reflection actual production are for shipbuilding provides a safe and reliable acceptance criteria.
Summary of the invention
Technical problem: the objective of the invention is in order to overcome the problem and shortage that prior art exists, solution can be simulated the technical problem of test of the weldability of ship steel truly, and a kind of experimental rig and test method of weldability for rolled steel for vessel is provided.
Technical scheme: in order to realize above-mentioned purpose, the technical scheme that the present invention solves its technical problem is:
A kind of experimental rig of weldability for rolled steel for vessel is formed by test plate (panel) with along the test plate (panel) width and with the perpendicular reinforcement that is welded to connect of this test plate (panel), and wherein said test plate (panel) is 2; Described reinforcement is 4; The opposite edges of adjacent test plate (panel) are processed with a gradient respectively, leave welded gaps and form 45 between adjacent two test plate (panel)s
± 5oV-arrangement shape recess; The one side of the corresponding V-arrangement shape of described reinforcement recess position offers a breach; Also be pasted with ceramic substrate on the one side of the breach of the corresponding reinforcement of described adjacent two test plate (panel)s.
The dimensions of the test plate (panel) of the above is long 700～1000mm, wide 260～300mm; The gradient that the opposite edges of adjacent test plate (panel) are processed with respectively is 22.5
± 2.5o
The dimensions of the reinforcement of the above is long 520～600mm, wide 70～200mm, thick 8～20mm; Described breach is a rectangle, and dimensions is long 40～60mm, dark 10～20mm.
Two adjacent spacings of the reinforcement of the above are 200～300mm; Foot welding height is 0.7 times of reinforcement thickness of slab.
Another technical scheme that the present invention solves its technical problem is:
A kind of test method of weldability for rolled steel for vessel comprises the steps:
(1) select the steel plate consistent with actual production to carry out cutting stock, it is 22.5 that test plate (panel) and reinforcement are processed the gradient respectively
± 2.5oGroove and long 40～60mm, the rectangle breach of dark 10～20mm;
(2) 2 test plate (panel) groups are right, as reserve to set welded gaps, simultaneously with 4 reinforcement spacings in uniform way welding by both sides be connected on the back side of test plate (panel), foot welding height is 0.7 times of reinforcement thickness of slab;
(3) paste ceramic substrate at the back side of test plate (panel);
(4) welded gaps of test plate (panel) being set by the welding variables of setting is welded;
(5) postwelding normal temperature was placed 24 hours down, adopted the dye penetrant inspection method that pilot seam is checked.
Wherein, described being welded as of above-mentioned steps (4) adopted pure CO
2Gas shielded arc welding welds, and welding material is a flux-cored wire of selecting diameter 1.2mm for use.
Beneficial effect: the experimental rig of a kind of weldability for rolled steel for vessel of the present invention and beneficial effect and the advantage that test method had are mainly reflected in:
The one, the gap of the test plate (panel) bevel for welding of experimental rig can be set, so can evaluate the difference of weldability under the different gap;
The 2nd, paste ceramic substrate at the test plate (panel) back side of experimental rig, fully the truth of real simulated boats and ships steel plate welding;
The 3rd, the test plate (panel) size of experimental rig is big, and the spacing of reinforcement is little, so whole constraint (restraint) degree is big.The welding material and the technology that under existing conventional weldability test method condition, do not crack, and in this experimental rig and test method, can both crack, and its rule conforms to fully with actual conditions, can simulate the weldability of ship steel in the actual production truly.
Description of drawings
Fig. 1 is a front view of the present invention,
Fig. 2 is a side view of the present invention,
Among the figure: 1. test piece for welding, 2. reinforcement, 3. ceramic substrate.
The specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Illustrated in figures 1 and 2, the experimental rig of the weldability of a kind of ship steel of the present invention is made up of two test plate (panel)s 1 and the reinforcement 2 that is welded on the test plate (panel), and the edge of every test plate (panel) 1 is processed with 22.5
± 2.5oThe gradient, two test plate (panel)s 1 form have a welded gaps and become 45
± 5oV-arrangement shape recess 4.It is dark that the middle part of reinforcement 2 has a 10～20mm; The rectangle breach 5 that 40～60mm is wide, the position of the corresponding reinforcement breach 5 in the back side of test plate (panel) is pasted with ceramic substrate 3, and reinforcement is welded in the back side of test plate (panel) and fixes for two-sided welding; Arrange 4 reinforcements 2 at the length direction of whole weldability test device, spacing is 200～300mm, the direction of the vertical and weld seam of reinforcement 2 directions, and foot welding height is 0.7 times of reinforcement thickness of slab.
The test procedure of the weldability of a kind of ship steel of the present invention is:
(1) select the thickness of slab consistent with actual production, test plate (panel) is by length 700～1000mm; Width 260～300mm cutting stock, reinforcement is by long 520～600mm, wide 70～200mm, thick 8～20mm cutting stock; And test plate (panel) and reinforcement are processed the gradient respectively is 22.5
± 2.5oGroove and long 40～60mm, the rectangle breach of dark 10～20mm;
(2) 1 group of two test plate (panel) of blanking are right, the setting welded gaps is 3～18mm, and 4 reinforcements 2 are welded on the back side of test plate (panel) 1, and spacing is 200～300mm.Foot welding height is 0.7 times of reinforcement 2 thickness of slab, adopts two-sided welding;
(3) paste ceramic substrate at the back side of test plate (panel) 1;
(4) adopt CO
2Gas shielded arc welding welds the welded gaps of organizing right test plate (panel), and welding material is selected flux-cored wire or the copper-plated solid welding wire of diameter 1.2mm for use; Wherein, welding variables is respectively: welding current 250A, and weldingvoltage 27V, speed of welding 8～25mm/min, when welded gaps was 3mm, speed of welding was 25mm/min; When welded gaps was 18mm, speed of welding was 8mm/min, and the welded gaps of other gap correspondences can interpolation be selected for use.The welding gimmick can be selected the method for swing for use according to the size of welded gaps, guarantees that all there is good fusion on the both sides of bevel for welding, and the root of groove assurance through welding, reaches one side welding with back formation;
(5) no matter the thickness of sheet material is tested a welding bead welding weldering together.Postwelding normal temperature was placed 24 hours, and pilot seam is checked.Check and adopt the dye penetrant inspection method to carry out.
Below be application example of the present invention:
Application example of the present invention has adopted the DH36 low-alloy high-strength steel as the test steel grade, experiment has adopted 6 groups of specifications to be all the steel plate of 700mm * 260mm * 26mm altogether, wlding is selected day flux-cored wire of the TWE-711 that safe wlding (Kunshan) Co., Ltd produces, the CO that welding machine adopts the Tangshan PANASONIC to produce for use
2Welding machine uses identical welding equipment to implement welding under different welding parameters and gap condition by same welder in the experiment, obtains a series of data and sees Table 1, the photo of postwelding flaw detection.
The data that the different welding conditions of table 1 obtain
After comparing and analyze, the photo distribution characteristics of the data of table 1 and postwelding flaw detection draws: adopt weldability test method of the present invention, welding current 250A in actual production, under the weldingvoltage 27V condition, welded gaps is from 3mm～18mm, different welding parameters produces weld crack in various degree, and is the most obvious with the weld crack of 3mm; 6mm does not have weld crack, and this is the welded gaps of shipyard regulation just; The 9mm weld crack has begun to increase, and the 12mm crackle is more and long, and 15mm reduces again to some extent, and 18mm does not almost have crackle.The actual conditions that the welding of this rule and shipyard is produced are very identical, illustrate that this test method reproduced the actual state of shipyard welding really.So, adopt the experimental rig of a kind of weldability for rolled steel for vessel of the present invention and test method to carry out the weldability evaluation to ship plate and welding material.
Claims (7)
1. the experimental rig of a weldability for rolled steel for vessel, it is characterized in that: this experimental rig is formed by test plate (panel) (1) with along test plate (panel) (1) width and with the perpendicular reinforcement that is welded to connect of this test plate (panel) (2), wherein said test plate (panel) (1) is 2, and described reinforcement (2) is 4; The opposite edges of adjacent two test plate (panel)s (1) are processed with a gradient respectively, leave welded gaps between two test plate (panel)s and form 45 ± 5 V-arrangement shape recesses (4) of spending; The one side of described reinforcement (2) corresponding V-arrangement shape recess (4) position offers a breach (5); Also be pasted with ceramic substrate (3) on the one side of the breach (5) of the described two corresponding reinforcements of adjacent test plate (panel) (1) (2).
2. the experimental rig of a kind of weldability for rolled steel for vessel according to claim 1 is characterized in that described breach (5) is rectangle, and dimensions is long 40～60mm, dark 10～20mm.
3. the experimental rig of a kind of weldability for rolled steel for vessel according to claim 1 is characterized in that: the dimensions of described test plate (panel) (1) is long 700～1000mm, wide 260～300mm; The gradient that the opposite edges of adjacent test plate (panel) (1) are processed with respectively is 22.5 ± 2.5 °.
4. the experimental rig of a kind of weldability for rolled steel for vessel according to claim 1 is characterized in that: the dimensions of described reinforcement (2) is long 520～600mm, wide 70～200mm, and thick 8～20mm, two adjacent spacings are 200～300mm.
5. the experimental rig of a kind of weldability for rolled steel for vessel according to claim 2 is characterized in that: described test plate (panel) (1) is that with being welded to connect of reinforcement (2) welding by both sides, foot welding height are 0.7 times of reinforcement (2) thickness of slab.
6. the test method of the experimental rig of a kind of weldability for rolled steel for vessel according to claim 1, it is characterized in that: this test method comprises the steps:
(1) selecting the steel plate consistent with actual production to carry out cutting stock, is 22.5 to the test plate (panel) processing gradient
± 2.5° groove and reinforcement added section chief 40～60mm, the rectangle breach of dark 10～20mm;
(2) 2 test plate (panel) groups are right, as reserve to set welded gaps, simultaneously with 4 reinforcement spacings in uniform way welding by both sides be connected on the back side of test plate (panel), foot welding height is 0.7 times of reinforcement thickness of slab;
(3) paste ceramic substrate at the back side of test plate (panel);
(4) be welding current 250A by the welding variables of setting, weldingvoltage 27V, speed of welding 8～25mm/min, the welded gaps that test plate (panel) is set is that 3～18mm welds;
(5) postwelding normal temperature was placed 24 hours down, adopted the dye penetrant inspection method that pilot seam is checked.
7. the test method of the experimental rig of a kind of weldability for rolled steel for vessel according to claim 6 is characterized in that: the described pure CO of employing that is welded as of described step (4)
2Gas shielded arc welding, welding material are the flux-cored wire of selecting diameter 1.2mm for use.
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| CN2008102350589A CN101402159B (en) | 2008-11-07 | 2008-11-07 | Device and method for testing weldability for rolled steel for vessel |
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| CN2008102350589A CN101402159B (en) | 2008-11-07 | 2008-11-07 | Device and method for testing weldability for rolled steel for vessel |
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| CN101402159B true CN101402159B (en) | 2010-12-01 |
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