WO2013038686A1 - 溶接構造体 - Google Patents

溶接構造体 Download PDF

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Publication number
WO2013038686A1
WO2013038686A1 PCT/JP2012/005858 JP2012005858W WO2013038686A1 WO 2013038686 A1 WO2013038686 A1 WO 2013038686A1 JP 2012005858 W JP2012005858 W JP 2012005858W WO 2013038686 A1 WO2013038686 A1 WO 2013038686A1
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WO
WIPO (PCT)
Prior art keywords
fillet
joined
welded
plate thickness
flange
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PCT/JP2012/005858
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English (en)
French (fr)
Japanese (ja)
Inventor
恒久 半田
聡 伊木
遠藤　茂
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020147007615A priority Critical patent/KR101427706B1/ko
Priority to BR112014005461-4A priority patent/BR112014005461B1/pt
Priority to JP2013527414A priority patent/JP5365761B2/ja
Priority to CN201280043942.7A priority patent/CN103796786B/zh
Publication of WO2013038686A1 publication Critical patent/WO2013038686A1/ja

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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
    • B23K9/00—Arc welding or cutting
    • B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • B23K9/0256—Seam welding; Backing means; Inserts for rectilinear seams for welding ribs on plates
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode

Definitions

  • the present invention relates to a welded steel structure welded using a thick steel plate, such as a large container ship or a bulk carrier, and more particularly, the propagation of a brittle crack generated from a thick steel plate base material or a welded joint.
  • the present invention relates to a welded structure excellent in brittle crack propagation stopping characteristics, which can be stopped before reaching a large-scale fracture of an object.
  • Container ships and bulk carriers for example, have a structure that has few partition walls in the hold and a large opening at the top of the ship, for example, unlike tankers, in order to improve loading capacity and cargo handling efficiency. . Therefore, in container ships and bulk carriers, it is necessary to increase the strength or thickness of the hull skin, in particular. In recent years, container ships have increased in size, and large ships of 6,000 to 20,000 TEU have been built. TEU (Twenty feet Equivalent Unit) represents the number of containers converted into a 20-foot container and represents an indicator of the loading capacity of container ships. Along with such an increase in size of a ship, a steel plate having a plate thickness of 50 mm or more and a yield strength of 390 N / mm grade 2 or more tends to be used for the hull outer plate.
  • TEU wenty feet Equivalent Unit
  • a steel plate to be a hull outer plate is often butt-welded by high heat input welding such as electrogas arc welding from the viewpoint of shortening the construction period.
  • high heat input welding such as electrogas arc welding
  • Such large heat input welding is likely to lead to a significant decrease in toughness at the weld heat affected zone, and has been one cause of the occurrence of brittle cracks at the weld joint.
  • Non-Patent Document 1 reports the results of an experimental study on the brittle crack propagation behavior of welds in steel plates for shipbuilding with a thickness of less than 50 mm.
  • the propagation path and propagation behavior of a brittle crack forcibly generated in a welded part are experimentally investigated.
  • a plurality of examples in which a brittle crack propagated along the line have been confirmed. This suggests that it cannot be said that there is no possibility that brittle fracture propagates straight along the weld.
  • Non-Patent Document 2 a thick steel plate having special brittle crack propagation stop characteristics is required in order to stop the propagation of the generated brittle cracks.
  • Patent Document 1 in a welded structure that is preferably a hull outer plate having a thickness of 50 mm or more, an aggregate is arranged so as to intersect the butt weld, and this aggregate is used. A welded structure joined by fillet welding is described. In the technique described in Patent Document 1, this aggregate has a mean circle equivalent particle diameter of 0.5 to 5 ⁇ m over a thickness of 3 mm or more in the surface layer portion and the back layer portion, and is parallel to the plate thickness surface ( 100) A steel sheet having a microstructure in which the X-ray plane intensity ratio of crystal planes is 1.5 or more is used.
  • Patent Document 2 includes a fillet welded joint obtained by fillet welding a joining member (hereinafter also referred to as a web) to a member to be joined (hereinafter also referred to as a flange), and has excellent brittle crack propagation stop characteristics.
  • a welded structure is described.
  • an unwelded portion is left on the butt surface of the web in the fillet welded joint cross section with the flange.
  • X is a special relational expression with the brittle crack propagation stop toughness Kca of the member to be joined (flange)
  • the width of the unwelded part is adjusted so as to satisfy the above.
  • Japan Shipbuilding Research Association No. 147 Research Group "Study on brittle fracture strength evaluation of high heat input high-strength steel joints for ship hulls", No. 87 (February 1978), p.35-53, Japan Shipbuilding Research Association. Yuki Yamaguchi et al .: “Development of super-large container ship-practical use of new high strength extra heavy steel plate", Journal of Japan Society of Marine Science and Technology, No. 3 (2005), p.70-76, November 2005.
  • the aggregate as a reinforcing material used in the technique described in Patent Document 1 requires a complicated process in order to obtain a steel sheet having a desired structure. For this reason, there has been a problem that productivity is lowered and it is difficult to stably secure a steel sheet having a desired structure.
  • the technique described in Patent Document 2 is a combination of the discontinuity of the structure and the brittle crack propagation stop characteristic of the joined member (flange), in the propagation of the brittle crack generated in the joining member (web). It is a technology that tries to prevent it.
  • Patent Document 2 In order to stop the propagation of brittle cracks generated in the members to be joined (flange) in the joining member (web), the technique described in Patent Document 2 is used to stop the propagation of brittle cracks in the joining member (web). Since the characteristics and the like are insufficient, it cannot be said that the technique is sufficient.
  • Patent Document 2 no consideration is given to the brittle crack propagation stop characteristic of the joining member (web). That is, the technique described in Patent Document 2 occurs on the strong deck (corresponding to a flange) of a large container ship, which is assumed in the “Brittle Crack Arrest Design Guidelines” (established in September 2009) of the NK class, for example. It cannot be said that it has sufficient crack propagation stop characteristics for the case where the brittle cracks propagated to the hatch side combing (corresponding to the web).
  • the present invention solves the problems of the prior art, and is brittle, capable of stopping (blocking) the propagation of brittle cracks occurring in a member to be joined (flange) to the joining member (web) before reaching a large-scale fracture.
  • An object of the present invention is to provide a welded structure having excellent crack propagation stopping characteristics.
  • the welded structure which this invention makes object is a welded structure provided with the fillet weld joint formed by abutting the end surface of a joining member (web) on the surface of a to-be-joined material (flange), and joining by fillet welding It is.
  • the present inventors diligently studied various factors affecting the brittle crack propagation stop characteristics in fillet welded joints.
  • a discontinuous portion is secured on the abutting surface between the member to be joined (flange) and the joining member (web), and brittleness occurs.
  • an unwelded portion that is, a discontinuous portion is secured on the surface where the surface of the member to be joined, the joining member, and the end face are abutted, and the joining member has a brittle crack propagation of 2500 N / mm 3/2 or more.
  • the joining member has stop toughness Kca, the leg length or weld width of the fillet weld is 16 mm or less, and the fillet weld toughness is high enough to satisfy a predetermined relationship with the plate thickness of the joined member.
  • an ultra-large structural model test body shown in FIG. 3B was produced, and a brittle crack propagation stop test was performed.
  • the ultra-large-sized structural model test body welded the steel plate of the same board thickness as the to-be-joined member (flange) 2 by the tack welding 8 below the to-be-joined member (flange) 2 of the large-scale fillet welded joint 9. Note that the ultra-large structural model specimen shown in FIG.
  • the mechanical notch 7 was hit to generate a brittle crack, and whether or not the propagation of the brittle crack stopped at the fillet weld was investigated. All tests were performed under the conditions of a stress of 257 N / mm 2 and a temperature of ⁇ 10 ° C.
  • the stress of 257 N / mm 2 is a value corresponding to the maximum allowable stress of the yield strength 390 N / mm grade 2 steel plate applied to the hull.
  • the temperature –10 ° C is the design temperature of the ship.
  • the unwelded portion ratio Y is 95% or more
  • the brittle crack propagation stop toughness Kca of the joining member (web) is about 6000 N / mm 3/2 or more (5500 to 6700 N / mm 3 / 2 ) If the relationship between the toughness of the fillet weld and the plate thickness t f of the member to be joined (flange) satisfies a specific relationship, even if the service stress is 257 N / mm 2 or more, It can be seen that the propagation of the brittle crack generated in the member to be joined (flange) to the joining member (web) can be prevented (stopped).
  • unwelded part ratio Y the ratio of the fillet weld width B and the joining member of the unwelded part in the joint cross-section (web) thickness t w, the value defined by (B / t w) ⁇ 100 (%)
  • Y the ratio of the fillet weld width B and the joining member of the unwelded part in the joint cross-section (web) thickness t w
  • t w the value defined by (B / t w) ⁇ 100 (%)
  • 4A and 4B show the case where the service stress is 257 N / mm 2 , but the average value of the stress that constantly acts on the hull is about 100 N / mm 2 .
  • Kca required to prevent (stop) the propagation of the brittle crack generated in the member to be joined (flange) to the joining member (web) is 6000 N / mm 3/2 ⁇ 100/257 ( ⁇ 2334 N / mm 3/2 ), if Kca is 2500 N / mm 3/2 or more, crack propagation is surely prevented against stress (about 100 N / mm 2 ) that constantly acts on the hull. Stop).
  • brittle crack is less likely to stop.
  • a welded structure (fillet welded joint) having a discontinuous portion with an unwelded portion ratio Y of 95% or more is used, the energy release rate at the brittle crack tip that has propagated decreases, and brittleness occurs. It has been found that the propagation of cracks tends to stop.
  • the joining member (web) has a brittle crack propagation stopping characteristic that exceeds a predetermined level. It has been found that if it is composed of a steel plate having it, it can be blocked in the joining member (web).
  • the present invention has been completed on the basis of such findings and further studies. That is, the gist of the present invention is as follows. 1. The end face of the joining member is abutted against the surface of the member to be joined having a plate thickness of 50 mm or more, and at least one of the welding leg length or welding width formed by joining the joining member and the member to be joined by fillet welding is a corner having a length of 16 mm or less.
  • a welded structure with a meat weld joint Said corner said with the end face of the joining member in the weld joint surface with abutted the surface of the bonded member, unwelded portion of 95% or more of the fillet weld joint thickness t w of the bonding member in cross-section
  • the Charpy impact test fracture surface transition temperature vTrs (° C.) of the fillet weld metal and the plate thickness t f of the joined member (flange) are expressed by the following formula (1) and / or Charpy impact test absorbed energy vE ⁇ 20 (J) at ⁇ 20 ° C.
  • the joining member is composed of a steel plate having a brittle crack propagation stopping toughness Kca of 2500 N / mm 3/2 or more at the service temperature of the welded structure.
  • Kca brittle crack propagation stopping toughness
  • VTrs ⁇ -1.5t f +90 (1) vE ⁇ 20 (J) ⁇ 5.75 (however, 50 ⁇ t f (mm) ⁇ 53), vE -20 (J) ⁇ 2.75t f (mm) -140 (however, t f (mm)> 53) (2)
  • vTrs Charpy impact test fracture surface transition temperature (° C) of fillet weld metal
  • vE -20 Test temperature: Charpy impact test absorbed energy (J) at -20 ° C
  • t f Plate thickness of the member to be joined (mm) 2.
  • the welded structure according to item 1 wherein the member to be joined having a thickness of 50 mm or more has a butt weld joint so as to intersect the joining member. 3.
  • the welded structure according to item 1 or 2 wherein the joining member is made of a steel plate having a brittle crack propagation stop toughness Kca of 6000 N / mm 3/2 or more at the service temperature of the welded structure.
  • (A) is a case where the member to be joined (flange) 2 is made only of a steel plate base material
  • (b) is a case where the member to be joined (flange) 2 has a butt weld joint. It is a graph which shows the influence of the relationship between the toughness of a fillet weld metal, and the flange plate thickness on the propagation stop of a brittle crack.
  • the end face of the joining member (web) 1 is abutted against the surface of the joined member (flange) 2 having a plate thickness of 50 mm or more, and the joining member (web) 1 and the joined member (flange) 2 are joined.
  • a welded structure formed by joining fillet welds includes a fillet weld joint having a fillet weld metal 5 having a weld leg length 3 or a weld width 12 of 16 mm or less.
  • FIG. 1A shows a case where the joining member (web) 1 is attached upright with respect to the joined member (flange) 2, but the present invention is not limited to this.
  • the joining member (web) 1 may be attached to the joined member (flange) 2 at an angle ⁇ .
  • the joining member (web) plate thickness tw used when determining the ratio Y (%) of the unwelded portion is the length of the intersection between the joining member (web) and the member to be joined (flange), (tw ) / Cos (90 ° - ⁇ ).
  • 3 is a weld leg length
  • 4 is an unwelded portion
  • 5 is a fillet weld metal
  • 12 is a weld width.
  • the welded structure according to the present invention is a non-welded portion in which the structure is discontinuous at the abutting surface between the joining member (web) 1 and the joined member (flange) 2 in the fillet welded joint. 4.
  • the butt surface between the joining member (web) 1 and the member to be joined (flange) 2 becomes a propagation surface of a brittle crack. Therefore, in the present invention, the unwelded portion 4 is present on the butt surface. .
  • the energy release rate (crack propagation driving force) at the tip of the brittle crack that has propagated through the member to be joined (flange) 2 is reduced, and the brittle crack tends to stop at the butt surface. Even if a brittle crack propagates to the joining member (web) 1 side, in the present invention, a fillet welded portion (fillet welded metal 5, heat affected zone (not shown in FIG. 1 is omitted) that retains toughness of a predetermined level or more.
  • the joining member is made of a steel plate having a brittle crack propagation stopping performance greater than or equal to a predetermined level, the brittle crack is caused by a fillet weld (fillet weld metal 5, heat affected zone (not shown in FIG. 1)). ) Or the base material of the joining member (web) 1.
  • the member to be joined (flange) 2 is a steel plate joined by the butt weld joint 11, and the joining member (web) intersects the welded portion (butt weld joint portion) 11 of the butt weld joint.
  • a fillet welded joint that is fillet welded is shown. Even in such a fillet welded joint, in order to prevent the propagation of the brittle crack generated from the butt weld joint part 11 to the joining member (web) 1, it is important to have a discontinuity in the structure.
  • FIG. 2A shows the appearance of the fillet weld joint
  • FIG. 2B shows the cross-sectional shape of the butt weld joint portion 11.
  • the dimensions of the unwelded part 4 in the fillet weld joint cross section since propagation suppression of brittle cracks, and more than 95% of the web thickness t w.
  • the dimensions of the unwelded part 4 can inhibit the propagation of brittle cracks, it is limited to 95% or more of the bonding member (web) thickness t w.
  • they are 96% or more and 100% or less.
  • the weld leg length or weld width of fillet welded joints shall be 16 mm or less.
  • the weld leg length or weld width of fillet welded joints is limited to 16 mm or less, which is easy to deform high tough fillet weld metal.
  • it is 15 mm or less.
  • the fillet weld metal in the fillet weld joint is toughness that satisfies the following formula (1) and / or the following formula (2) in relation to the plate thickness t f of the member to be joined (flange). Adjust to ensure vTrs ⁇ -1.5t f +90 (1) vE ⁇ 20 ⁇ 5.75 (however, 50 ⁇ t f (mm) ⁇ 53), vE -20 ⁇ 2.75t f (mm)-140 (however, t f (mm)> 53) (2) (Where vTrs: Charpy impact test fracture surface transition temperature of fillet weld metal (° C), vE -20 : Test temperature: Charpy impact test absorbed energy (J) at -20 ° C, t f : Member to be joined ( (Flange) thickness (mm))) When the toughness of the fillet weld metal satisfies the above-described formula (1) and / or (2) in relation to the plate thickness
  • a welded structure in which the plate thickness of the member to be joined (flange) is 50 mm or more can be made into a welded structure that ensures a certain degree of brittle crack propagation prevention characteristics. If the toughness of the fillet weld metal does not satisfy either of the above formulas (1) and (2), the fillet weld metal has insufficient toughness and has been generated and propagated in the joined member (flange). Brittle cracks cannot be prevented from propagating at fillet welds.
  • the length of the welded structure (flange) generated by the steel plate constituting the joining member (web) may be long.
  • the propagation of brittle cracks cannot be prevented by the joining member (web). Therefore, in the present invention, it is preferable to select the brittle crack propagation stop toughness that the steel sheet to be applied to the joining member (web) should have in accordance with the stress acting on the structure.
  • the joining member (web) of the welded structure that satisfies the above-described conditions has, for example, arrest performance (Kca ⁇ 2500 N / mm 3/2 ) equivalent to that of ordinary shipbuilding class E steel.
  • arrest performance Kca ⁇ 2500 N / mm 3/2
  • stress conditions of about 100 N / mm 2
  • propagation of a long brittle crack is prevented under a stress condition equivalent to the maximum allowable stress that occurs rarely (stress condition of about 257 to 283 N / mm 2 ) due to a storm or the like. It becomes difficult.
  • the service temperature is applied to the joining member (web).
  • the present inventors have confirmed that it is necessary to apply a steel plate having a brittle crack propagation stop toughness Kca of 6000 N / mm 3/2 or more. This makes it possible to prevent the propagation of long brittle cracks even under stress conditions equivalent to the maximum allowable stress (stress conditions of about 257 to 283 N / mm 2 ).
  • composition and manufacturing method of a steel sheet having a brittle crack propagation stop toughness Kca of 6000 N / mm 3/2 or more at a service temperature for example, a hull design temperature of ⁇ 10 ° C.
  • a service temperature for example, a hull design temperature of ⁇ 10 ° C.
  • the welded structure of the present invention is provided with the above-described fillet welded joint.
  • a hull structure with a ship hull outer plate as a flange and a bulkhead as a web, or a deck as a flange, and a hatch as a web can be applied to the hull structure.
  • Thick steel plates with the plate thickness and brittle crack propagation stoppage characteristics (Kca at -10 ° C) shown in Table 1 are used as joining members (webs), and thick steel plates with the thicknesses shown in Table 1 are used as joined members (flanges).
  • fillet welding was performed to produce a large fillet welded joint having an actual structure size as shown in FIGS. 3 (a) and 3 (b).
  • the width B of the part / the thickness (tw) of the joining member (web) was varied.
  • the to-be-joined member (flange) was a thick steel plate (base material only) (FIG. 3A) and a thick steel plate having a butt weld joint (FIG. 3B).
  • Butt welded joints were made by one-pass high heat input electrogas arc welding (SEGARC and two-electrode SEGARC) or multilayer CO 2 welding.
  • the fillet welded joint is a fillet welded joint having fillet weld metal with various toughness, various weld leg lengths and welding widths by changing welding conditions such as welding material, welding heat input, shield gas, etc. .
  • the toughness of fillet weld metal Charpy impact test specimens (10 mm thick) were taken from fillet weld metal, and the absorbed energy vE ⁇ 20 at a test temperature of ⁇ 20 ° C. in accordance with the provisions of JIS Z 2242. J) and the fracture surface transition temperature vTrs (° C.).
  • an ultra-large structural model test body shown in FIG. 3 was prepared, and a brittle crack propagation stop test was performed.
  • the ultra-large-sized structural model test body welded the steel plate of the same board thickness as the to-be-joined member (flange) 2 by the tack welding 8 below the to-be-joined member (flange) 2 of the large-scale fillet welded joint 9.
  • the butt weld joint 11 of the member to be joined (flange) is produced so as to be orthogonal to the joint member (web), and the tip of the mechanical notch 7 is butt-joined. It processed so that it might become the BOND part of the welded joint part 11, or the weld metal WM.
  • the stress 100 N / mm 2 is an average value of stress that constantly acts on the hull.
  • the stress 257 N / mm 2 is a value corresponding to the maximum allowable stress of the yield strength 390 N / mm grade 2 steel plate applied to the hull.
  • the stress 283 N / mm 2 is a value corresponding to the maximum allowable stress of the yield strength 460 N / mm 2 grade steel plate applied to the hull.
  • the temperature –10 ° C is the design temperature of the ship.
  • the brittle crack propagated from the fillet weld metal from the member to be joined (flange) of the fillet weld, and entered the joint member (web) and stopped.
  • the brittle crack propagated without stopping at the fillet weld and the joining member (web), and the propagation of the brittle crack could not be prevented.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
PCT/JP2012/005858 2011-09-13 2012-09-13 溶接構造体 WO2013038686A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020147007615A KR101427706B1 (ko) 2011-09-13 2012-09-13 용접 구조체
BR112014005461-4A BR112014005461B1 (pt) 2011-09-13 2012-09-13 estrutura soldada
JP2013527414A JP5365761B2 (ja) 2011-09-13 2012-09-13 溶接構造体
CN201280043942.7A CN103796786B (zh) 2011-09-13 2012-09-13 焊接结构体

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JP2011-199230 2011-09-13
JP2011199230 2011-09-13

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WO (1) WO2013038686A1 (pt)

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WO2016143354A1 (ja) * 2015-03-12 2016-09-15 Ｊｆｅスチール株式会社 溶接構造体
JP6615215B2 (ja) 2016-06-16 2019-12-04 Ｊｆｅスチール株式会社 脆性亀裂伝播停止特性に優れる溶接構造体
CN109311126B (zh) * 2016-06-16 2021-03-26 杰富意钢铁株式会社 脆性裂纹传播停止特性优异的焊接结构体
KR102119175B1 (ko) 2018-05-18 2020-06-04 닛폰세이테츠 가부시키가이샤 용접 구조체
KR102506231B1 (ko) 2018-12-26 2023-03-06 닛폰세이테츠 가부시키가이샤 용접 구조체
KR102105614B1 (ko) 2018-12-26 2020-04-28 닛폰세이테츠 가부시키가이샤 용접 구조체
CN117241907A (zh) 2021-06-15 2023-12-15 杰富意钢铁株式会社 焊接结构体
KR20230162021A (ko) 2021-07-26 2023-11-28 닛폰세이테츠 가부시키가이샤 용접 구조체, 그리고 그 설계 방법 및 시공 방법

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KR20140044406A (ko) 2014-04-14
CN103796786B (zh) 2015-04-22
BR112014005461A2 (pt) 2017-03-21
JP5365761B2 (ja) 2013-12-11
JPWO2013038686A1 (ja) 2015-03-23
BR112014005461B1 (pt) 2018-12-04
CN103796786A (zh) 2014-05-14

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