JPWO2013069573A1 - Curved overlay welding method and lance manufacturing method using the same - Google Patents

Curved overlay welding method and lance manufacturing method using the same Download PDF

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JPWO2013069573A1
JPWO2013069573A1 JP2012078496A JP2013542960A JPWO2013069573A1 JP WO2013069573 A1 JPWO2013069573 A1 JP WO2013069573A1 JP 2012078496 A JP2012078496 A JP 2012078496A JP 2013542960 A JP2013542960 A JP 2013542960A JP WO2013069573 A1 JPWO2013069573 A1 JP WO2013069573A1
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curved
overlay welding
lance
steel
pipe
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JP5951631B2 (en
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雅英 山下
雅英 山下
純 平田
純 平田
真悟 塚本
真悟 塚本
浩文 榎戸
浩文 榎戸
池上 博文
博文 池上
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株式会社フジコー
品川リフラクトリーズ株式会社
Jfeスチール株式会社
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Priority to PCT/JP2012/078496 priority patent/WO2013069573A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/04Welding for other purposes than joining, e.g. built-up welding
    • B23K9/044Built-up welding on three-dimensional surfaces
    • B23K9/046Built-up welding on three-dimensional surfaces on surfaces of revolution
    • B23K9/048Built-up welding on three-dimensional surfaces on surfaces of revolution on cylindrical surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001Interlayers, transition pieces for metallurgical bonding of workpieces
    • B23K35/004Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of a metal of the iron group
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/308Fe as the principal constituent with Cr as next major constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/32Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/327Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment

Abstract

一部又は全部が曲面からなるランス(10)の内管(14)の内部で屈曲部分(16)の半径方向外側に形成される被溶接領域に、鉄製又はステンレス製の網材(29−31)を仮止めする第1工程と、網材(29−31)の上から耐熱耐摩耗性を有する金属の肉盛溶接を行い、被溶接領域に肉盛部(19−21)を形成する第2工程とを有する。これによって、曲面を有する鋼構造物(例えば、ベント部を有する管)の内側表面に円滑に耐熱耐摩耗性を有する金属の肉盛溶接を行うことができる。An iron or stainless steel mesh material (29-31) is formed in a welded area formed on the radially outer side of the bent portion (16) inside the inner tube (14) of the lance (10) partially or entirely curved. ) To temporarily fix), and overlay welding of a metal having heat resistance and wear resistance is performed from above the mesh material (29-31), and the overlay portion (19-21) is formed in the welded region. 2 steps. Thereby, overlay welding of a metal having heat resistance and wear resistance can be smoothly performed on the inner surface of a steel structure having a curved surface (for example, a pipe having a vent portion).

Description

本発明は、例えば、製鉄所で使用するランス(詳細には、「インジェクションランス」という)等の曲面を有する鋼構造物の一部に耐摩耗性を向上するために行う肉盛溶接の方法及びそれを用いたランスの製造方法に関する。 The present invention is, for example, a method of overlay welding performed to improve wear resistance on a part of a steel structure having a curved surface such as a lance used in a steel mill (specifically, an “injection lance”) and the like. The present invention relates to a lance manufacturing method using the same.
特許文献1に示すように、例えば、高炉から排出された溶銑をトピードカー等で溶銑予備処理を行う場合には、先側が折れ曲がったランスが使用され、通常はこの折れ曲がった部分に曲がり管(ベント管)が使用され、前後の直管に溶接されている。そして、特許文献1においては、曲がり部分の内面に曲がり管の内径の1/20〜1/2の高さを有する金属性の突片を設け、この突片の隙間部分に積極的に処理剤を溜めて、この部分の耐摩耗性を高めている。 As shown in Patent Document 1, for example, when hot metal discharged from a blast furnace is subjected to hot metal pretreatment with a topped car or the like, a lance with a bent front side is used, and a bent pipe (vent pipe) is usually used at the bent portion. ) And is welded to the front and back straight pipes. And in patent document 1, the metallic protrusion which has the height of 1 / 20-1 / 2 of the internal diameter of a bending pipe is provided in the inner surface of the bending part, and a processing agent is positively provided in the clearance gap part of this protruding piece. This increases the wear resistance of this part.
一方、特許文献2には、鋼管の内側に高炭素鋼よりなるクラッドメタルを肉盛溶接する方法が提案され、これにより鋼管の内側の耐摩耗性を確保している。
また、特許文献3に示すように、出願人は基材の表面にニッケル基合金やステンレス合金等を肉盛溶接して、基材の耐摩耗性を高めることを提案している。
On the other hand, Patent Document 2 proposes a method of overlay welding a clad metal made of high carbon steel on the inside of a steel pipe, thereby ensuring wear resistance on the inside of the steel pipe.
Moreover, as shown in Patent Document 3, the applicant has proposed that the base material is welded with a nickel-base alloy, a stainless alloy, or the like to increase the wear resistance of the base material.
特開2010−222592号公報JP 2010-222592 A 特開平10−8191号公報Japanese Patent Laid-Open No. 10-8191 特開2008−93732号公報JP 2008-93732 A
しかしながら、特許文献1記載の技術では、突片の隙間に溜まった処理剤が成長し、時間の経過と共に、ランスの有効径が小さくなり、場合によってはランスが閉塞するという問題があった。
そこで、本出願人はこのランスの内部に耐摩耗性金属を肉盛溶接して、処理剤の詰まりを防止することを鋭意研究した。
However, the technique described in Patent Document 1 has a problem in that the treatment agent accumulated in the gap between the projecting pieces grows, and the effective diameter of the lance becomes smaller with time, and the lance is sometimes blocked.
Therefore, the present applicant has intensively studied to prevent clogging of the processing agent by overlay welding a wear-resistant metal inside the lance.
ところが、ランスの内側に使用される管(芯金)は通常直径が100mm以下の小径管となって、直管の場合は、溶接トーチを下向きにして管を回転させれば、ある程度の肉盛溶接は可能であるが、途中で折れ曲がった部分を肉盛溶接する場合、溶接トーチを溶接場所の凹凸に対応させて行う以外はなく、この場合、溶接箇所が必ずしも平面又は近似平面とはならず、このため、肉盛部となる溶融金属が傾斜面を流れ、安定した溶接が行えないという問題があった。 However, the pipe (core metal) used inside the lance is usually a small diameter pipe having a diameter of 100 mm or less. In the case of a straight pipe, if the pipe is rotated with the welding torch facing downward, a certain amount of buildup is achieved. Welding is possible, but when overlay welding is performed on a bent part in the middle, there is no other way than to perform the welding torch corresponding to the unevenness of the welding location, and in this case, the welding location is not necessarily a plane or approximate plane. For this reason, there existed a problem that the molten metal used as a build-up part flowed on the inclined surface, and the stable welding could not be performed.
本発明は、かかる事情に鑑みてなされたもので、曲面を有する被溶接物(例えば、ベント部を有する鋼管)であって、その内側表面に円滑に耐摩耗性の肉盛溶接を行うことが可能な曲面の肉盛溶接方法及びそれを用いたランスの製造方法を提供することを目的とする。 This invention is made | formed in view of this situation, Comprising: It is a to-be-welded object (for example, steel pipe which has a vent part) which has a curved surface, Comprising: Wear-resistant overlay welding can be smoothly performed on the inner surface. An object of the present invention is to provide a method of overlay welding of a possible curved surface and a method of manufacturing a lance using the same.
前記目的に沿う第1の発明に係る曲面の肉盛溶接方法は、一部又は全部が曲面からなる鋼構造物の被溶接領域に、鉄製又はステンレス製の網材を仮止めする第1工程と、前記網材の上から肉盛溶接を行う第2工程とを有する。ここで、前記鋼構造物は、例えば鋼管(炭素鋼鋼管、ステンレス鋼鋼管のいずれも含む)であって、被溶接領域はその内側面であってもよい。 The curved surface overlay welding method according to the first invention that meets the above-mentioned object includes a first step of temporarily fixing an iron or stainless steel mesh material to a welded region of a steel structure that is partially or entirely curved. And a second step of performing overlay welding from above the mesh material. Here, the steel structure may be, for example, a steel pipe (including both a carbon steel pipe and a stainless steel pipe), and the welded area may be an inner surface thereof.
第1の発明に係る曲面の肉盛溶接方法において、前記網材は、鋼製のエキスパンドメタルであるのが好ましいが、肉盛する溶湯の流れを邪魔するのであれば、他の金網材であっても使用できる。 In the method for overlay welding of curved surfaces according to the first invention, the mesh material is preferably a steel expanded metal. However, if it interferes with the flow of the molten metal, it may be another wire mesh material. Can also be used.
第2の発明に係る曲面の肉盛溶接方法は、第1の発明に係る曲面の肉盛溶接方法において、前記鋼構造物は炭素鋼であって、前記肉盛溶接を行う溶材は、耐熱耐摩耗性を有する高クロム鋳鉄系のワイヤであるとしている。ここで、前記溶材は、高温で耐摩耗性を有する溶接可能な金属であれば、他の金属であってもよい。 The curved surface overlay welding method according to the second invention is the curved surface overlay welding method according to the first invention, wherein the steel structure is carbon steel, and the welding material for the overlay welding is heat resistant and resistant. It is said that it is a high chromium cast iron-based wire having wear characteristics. Here, the molten material may be another metal as long as it is a weldable metal having wear resistance at a high temperature.
また、第3の発明に係る曲面の肉盛溶接方法は、前記鋼構造物を鋼管とした第1、第2の発明に係る曲面の肉盛溶接方法において、前記鋼管は製鉄所で用いる溶融金属に添加材を吹き込むランスであって、前記被溶接領域は前記ランスの屈曲部分の半径方向外側領域である。この場合、前記被溶接領域は前記ランスの屈曲部分の半径方向外側稜線を中心にして180度以上の範囲(例えば、180〜280度)であるのがよい。 A curved surface overlay welding method according to a third aspect of the invention is the curved surface overlay welding method according to the first and second aspects of the invention, wherein the steel structure is a steel pipe, wherein the steel pipe is a molten metal used at a steel mill. The welded region is a radially outer region of the bent portion of the lance. In this case, the area to be welded is preferably in a range of 180 degrees or more (for example, 180 to 280 degrees) around the radially outer ridge line of the bent portion of the lance.
第3の発明に係る曲面の肉盛溶接方法において、前記ランスの屈曲部分は、曲がり管と該曲がり管の端部に溶接される第1、第2の直管の一部からなって、前記被溶接領域は、前記第1、第2の直管と前記曲がり管との溶接部を除く、前記曲がり管と前記第1、第2の直管の前記溶接部近傍の領域であるとするのが好ましい。 In the overlay welding method of the curved surface according to the third invention, the bent portion of the lance is composed of a bent pipe and a part of the first and second straight pipes welded to the end of the bent pipe, The welded area is an area in the vicinity of the welded portion of the bent pipe and the first and second straight pipes, excluding the welded part between the first and second straight pipes and the bent pipe. Is preferred.
第4の発明に係るランスの製造方法は、以上の第1〜第3の発明に係る曲面の肉盛溶接方法を適用する。なお、ランスの内管の曲面(屈曲部分)以外の部分については、周知の方法を用いてランスを製造することが可能である。 The lance manufacturing method according to the fourth aspect of the present invention applies the curved surface overlay welding method according to the above first to third aspects of the invention. In addition, about parts other than the curved surface (bending part) of the inner tube | pipe of a lance, it is possible to manufacture a lance using a well-known method.
第4の発明に係るランスの製造方法において、前記肉盛溶接の表面を更に不定形耐火材で覆うこともできる。この場合、不定形耐火材は吹き付け又は溶射、場合によっては塗布によって行うことができる。不定形耐火材の厚みは1〜4mm程度が好ましい。 In the lance manufacturing method according to the fourth invention, the surface of the overlay welding can be further covered with an irregular refractory material. In this case, the amorphous refractory material can be applied by spraying or spraying, and in some cases by application. The thickness of the amorphous refractory material is preferably about 1 to 4 mm.
本発明に係る曲面の肉盛溶接方法は、一部又は全部が曲面となる鋼構造物の被溶接領域に、鉄製又はステンレス製の網材を仮止めした後、肉盛溶接を行うので、溶湯が網材によって堰止められて、肉盛溶接位置に残る。従って、耐摩耗性金属の肉盛溶接が支障なく行える。 The curved surface overlay welding method according to the present invention performs overlay welding after temporarily fixing an iron or stainless steel mesh material to a welded region of a steel structure in which a part or all of the curved surface is curved. Is blocked by the mesh material and remains at the overlay welding position. Therefore, overlay welding of wear-resistant metal can be performed without hindrance.
特に、鋼構造物の被溶接領域が例えば、製鉄所で用いるランスの内管の屈曲部分の半径方向外側の内面である場合には、その部分に耐熱耐磨耗性の金属を肉盛溶接することによって、その部分の硬質化が図られ、通過する粉又は粒状物による摩耗の進行度が遅れ、長期の寿命を有するランスとなる。
肉盛溶接を行う溶材として、耐熱耐摩耗性を有する金属の一例である高クロム鋳鉄系のワイヤを使用することによって溶接がより簡単になり、更に硬質の肉盛面が形成される。
In particular, when the welded region of the steel structure is, for example, the radially inner surface of the bent portion of the inner tube of a lance used in a steel mill, the heat-resistant and wear-resistant metal is overlay welded to that portion. As a result, the portion is hardened, the progress of wear due to the passing powder or particulate matter is delayed, and the lance has a long life.
By using a high chromium cast iron-based wire, which is an example of a metal having heat resistance and wear resistance, as a molten material for overlay welding, welding becomes easier and a hard overlay surface is formed.
更に、網材として鋼製のエキスパンドメタルを用いることによって、材料入手が容易となり、溶接も容易となる。なお、このエキスパンドメタルが溶けて、肉盛金属の成分を希釈することになるが、母材も鋼であることもあって、鋼製のエキスパンドメタルを使用しても特に支障はない。 Furthermore, the use of steel expanded metal as the netting material makes it easy to obtain materials and facilitate welding. In addition, although this expanded metal melt | dissolves and the component of overlay metal is diluted, since a base material may also be steel, even if it uses steel expanded metal, there will be no trouble in particular.
更に、本発明に係る曲面の肉盛溶接方法を適用したランスの製造方法においては、ランス内面の屈曲部分に施工の容易な方法によって肉盛溶接がなされているので、溶接作業が安定し、肉盛溶接部の信頼性も向上する。
また、その肉盛金属の表面を不定形耐火材で覆うと、更にランスの寿命が延びる。
Further, in the lance manufacturing method to which the curved surface overlay welding method according to the present invention is applied, overlay welding is performed on the bent portion of the lance inner surface by an easy construction method, so that the welding operation is stable, and the The reliability of the welded area is also improved.
Moreover, if the surface of the overlay metal is covered with an irregular refractory material, the life of the lance is further extended.
(A)は本発明の第1の実施例に係る曲面の肉盛溶接方法を適用するランス(内管)の説明図、(B)は同図(A)のP−P’断面図である。(A) is explanatory drawing of the lance (inner tube) to which the overlay welding method of the curved surface which concerns on 1st Example of this invention is applied, (B) is PP 'sectional drawing of the same figure (A). . (A)〜(C)はそれぞれ同曲面の肉盛溶接方法に用いるエキスパンドメタルの平面図である。(A)-(C) are top views of the expanded metal used for the overlay welding method of the same curved surface, respectively. ランスの側面図である。It is a side view of a lance. 摩耗試験の試験装置の概略説明図である。It is a schematic explanatory drawing of the test apparatus of an abrasion test. 摩耗試験の結果を示すグラフである。It is a graph which shows the result of an abrasion test. 本発明の第2の実施例に係る曲面の肉盛溶接方法を適用するランスの説明図である。It is explanatory drawing of the lance which applies the overlay welding method of the curved surface which concerns on the 2nd Example of this invention. (A)は図6における矢視Q−Q’及びR−R’断面図で、(B)は図6における矢視S−S’断面図である(但し、外側の耐火物は省略している)。(A) is an arrow QQ 'and RR' sectional view in FIG. 6, (B) is an arrow SS 'sectional view in FIG. 6 (however, the outer refractory is omitted) ) (A)〜(C)はそれぞれ本発明の第2の実施例に係る曲面の肉盛溶接方法に用いるエキスパンドメタルの平面図である。(A)-(C) are each a top view of the expanded metal used for the overlay welding method of the curved surface which concerns on the 2nd Example of this invention.
続いて、添付した図面を参照しながら、本発明の第1の実施例に係る曲面の肉盛溶接方法及びランスの製造方法について説明する。
図3に、製鉄所で使用するトピードカー等で溶鋼(溶融金属)中に燃料ガスや添加材(例えば、酸化鉄粉や石灰粉)を吹き込むのに使用するランス10を示すが、ランス10は直管領域11と先部の折れ曲がり領域12を有して、各直線領域11及び折れ曲がり領域12は、外側が耐火物13で覆われ、内部は内管14(一部又は全部が曲面からなる鋼構造物である鋼管の一例)と外管15の二重管構造となっている。
Next, a curved surface overlay welding method and a lance manufacturing method according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 3 shows a lance 10 used for blowing fuel gas and additives (for example, iron oxide powder and lime powder) into molten steel (molten metal) with a topped car used at a steel mill. It has a tube region 11 and a bent region 12 at the tip, and each straight region 11 and the bent region 12 are covered with a refractory 13 on the outside, and an inner tube 14 (a part or all of which is a curved steel structure) An example of a steel pipe which is an object) and a double pipe structure of the outer pipe 15.
内管14及び外管15の間には少しの隙間が形成され、この隙間にはプロパンガスが流れ、内管14の内部に添加材が、例えば、空気、酸素ガス、窒素ガス、アルゴンガス又はこれらの混合ガスを用いて、気流搬送される構造となっている。
図1(A)、(B)に示すように、内管14の屈曲部分16の内側面18の半径方向外側領域(被溶接領域となる)には、高クロム鋳鉄による肉盛部19〜21が形成されている。以下、この肉盛部19〜21について詳細に説明する。
A small gap is formed between the inner pipe 14 and the outer pipe 15, and propane gas flows through this gap, and an additive is added to the inside of the inner pipe 14, for example, air, oxygen gas, nitrogen gas, argon gas or Using these mixed gases, the structure is such that the air current is conveyed.
As shown in FIGS. 1 (A) and 1 (B), in the radially outer region (becomes a welded region) of the inner side surface 18 of the bent portion 16 of the inner tube 14, there is a built-up portion 19 to 21 made of high chromium cast iron. Is formed. Hereinafter, the built-up portions 19 to 21 will be described in detail.
内管14には、この実施例では、外径が60.5mmの炭素鋼鋼管(STPG)が使用されて、第1の直管23と短尺の第2の直管24がエルボ(115度の曲がり管、ベント)25を介して溶接にて連結されている。26、27はこれらの溶接部を示す。肉盛部19〜21は溶接部26、27を除く溶接部26、27近傍の領域に形成されている。外管15は内管14の外側にスペーサ等を介して少しの隙間(例えば5〜10mm)を有して設けられているが、構造は周知であるので省略する。なお、屈曲部分16は、エルボ25とエルボ25の端部に溶接される第1、第2の直管23、24の一部からなる。 In this embodiment, a carbon steel pipe (STPG) having an outer diameter of 60.5 mm is used as the inner pipe 14, and the first straight pipe 23 and the short second straight pipe 24 are elbows (115 degrees). It is connected by welding via a bent pipe (bent) 25. Reference numerals 26 and 27 denote these welds. The built-up portions 19 to 21 are formed in regions near the welded portions 26 and 27 excluding the welded portions 26 and 27. The outer tube 15 is provided outside the inner tube 14 with a small gap (for example, 5 to 10 mm) via a spacer or the like, but the structure is well known and will be omitted. The bent portion 16 includes an elbow 25 and a part of the first and second straight pipes 23 and 24 welded to the end portions of the elbow 25.
図2(A)、(C)に示すように、第1、第2の直管23、24及びエルボ24が溶接接合されていない状態で、第1、第2の直管23、24の管端から5〜15mmの位置に幅8〜15mmの網材の一例である鋼製のエキスパンドメタル29、30を180度円弧状に曲げた状態で配置し、溶接にて仮止めする。エキスパンドメタル29、30としては、メッシュ寸法が12〜25mm、板厚が1.2〜1.6mmのもの(例えば、JISG3351、XS31又はXS41)を使用する。 As shown in FIGS. 2A and 2C, the first and second straight pipes 23 and 24 are in a state where the first and second straight pipes 23 and 24 and the elbow 24 are not welded. Steel expanded metals 29 and 30 which are examples of a mesh material having a width of 8 to 15 mm are arranged in a state bent to a circular arc of 180 degrees at a position of 5 to 15 mm from the end, and temporarily fixed by welding. As the expanded metals 29 and 30, those having a mesh size of 12 to 25 mm and a plate thickness of 1.2 to 1.6 mm (for example, JISG3351, XS31 or XS41) are used.
また、図2(B)に示すように、エルボ25の内側面で曲がり半径が大きい部分(即ち、半径方向外側領域)に、両端部から5〜15mmの隙間を設けて、エルボ25の内側面半分に合わせて成形したエキスパンドメタル31を配置し、溶接にて仮止めする。このエキスパンドメタル31は第1、第2の直管23、24に使用したものと同一のものを使用する。
この状態で、エキスパンドメタル29〜31の上から耐熱耐摩耗性を有する金属の一例である高クロム鋳鉄系金属の肉盛溶接を行う。なお、図1(B)において角度αは被溶接領域の角度を示し、半径方向外側の稜線fを中心に円周方向にそれぞれ90度以上(即ち合計で180度以上)の領域を肉盛溶接している。
この場合、円周方向全領域を肉盛溶接することも可能であるが、半径方向内側は添加材が衝突しないので、積極的には必要ではない。半径方向内側に非肉盛溶接部を設けることによって、ガスの通過断面積が大きくなるという利点がある(以下の実施例においても同じ)。
Further, as shown in FIG. 2 (B), the inner surface of the elbow 25 is provided with a gap of 5 to 15 mm from both ends in a portion having a large bending radius (that is, a radially outer region) on the inner surface of the elbow 25. The expanded metal 31 formed according to the half is placed and temporarily fixed by welding. The expanded metal 31 is the same as that used for the first and second straight pipes 23 and 24.
In this state, build-up welding of a high chromium cast iron metal, which is an example of a metal having heat resistance and wear resistance, is performed on the expanded metals 29 to 31. In FIG. 1 (B), the angle α indicates the angle of the welded area, and the areas of 90 degrees or more (that is, 180 degrees or more in total) are circumferentially welded around the ridge line f on the outer side in the radial direction. doing.
In this case, it is possible to build-up the entire circumferential region, but it is not necessary actively because the additive does not collide on the radially inner side. Providing the non-build-up weld on the radially inner side has the advantage that the gas cross-sectional area increases (the same applies to the following examples).
高クロム鋳鉄系金属の溶材としては高クロム鋳鉄系のフラックス入りワイヤを用い、炭酸ガスアーク溶接法で肉盛溶接を行う。これによって、内管14の内側表面が溶融し、エキスパンドメタル29〜31も部分的に溶融するが、エキスパンドメタル29〜31の各線材が堰を形成し、溶融金属の流れを制止する。勿論、エキスパンドメタル29〜31の一部が溶けて高クロム鋳鉄系金属が希釈される。また、エキスパンドメタル29〜31の一部は未溶融の状態で残ることがあるが、耐摩耗性には影響はない。 As a high chromium cast iron metal melt, high chromium cast iron flux cored wire is used, and overlay welding is performed by a carbon dioxide arc welding method. As a result, the inner surface of the inner pipe 14 is melted and the expanded metals 29 to 31 are also partially melted. However, each wire of the expanded metals 29 to 31 forms a weir and restricts the flow of the molten metal. Of course, a part of the expanded metals 29 to 31 is melted to dilute the high chromium cast iron metal. Further, some of the expanded metals 29 to 31 may remain in an unmelted state, but the wear resistance is not affected.
ここで、必要がある場合、高クロム鋳鉄系の金属を2層又は多層盛りしてもよい。盛り数が多くなる程希釈率は高くなるが、手間もかかり厚みも厚くなるので、これらを考慮して行う必要がある。なお、肉盛金属の厚みは例えば3〜5mm程度である。 Here, if necessary, two or more layers of high chromium cast iron metal may be stacked. The dilution rate increases as the number of plates increases. However, it takes time and effort, and it is necessary to take these into consideration. The thickness of the overlay metal is, for example, about 3 to 5 mm.
この後、第1、第2の直管23、24の角度方向を合わせて、エルボ25の両端に仮付けした後、溶接する。この場合の溶接に使用する溶材は通常、鋼板を溶接するワイヤを使用する。これによって、溶接部26、27が形成される。内管14の内周面の溶接部26、27には幅約20mm程度の溝が形成されていることになるが、この溝内にはこのランス10を通過する添加材が堆積し、結果としてこの詰まった添加材が半径方向外側に配置される溶接部26、27の保護を行う。 Thereafter, the first and second straight pipes 23 and 24 are aligned with each other, temporarily attached to both ends of the elbow 25, and then welded. In this case, the melt used for welding usually uses a wire for welding a steel plate. As a result, welds 26 and 27 are formed. A groove having a width of about 20 mm is formed in the welded portions 26 and 27 on the inner peripheral surface of the inner pipe 14, and an additive passing through the lance 10 is deposited in the groove, and as a result. This clogged additive protects the welded portions 26 and 27 arranged on the radially outer side.
この肉盛部19〜21の特性について説明する。肉盛部19〜21の形成にあっては、溶接金属中に多量のクロム炭化物、及びNb、Mo、W、V等の炭化物を生成し、極めて高い硬度を示す。ロード10kgのビッカース硬さHVの最低硬さは882、最高硬さは960、平均硬さは921である。なお、HVは定数×試験力/くぼみの表面積(定数=0.102)で表される。 The characteristics of the built-up portions 19 to 21 will be described. In the formation of the built-up portions 19 to 21, a large amount of chromium carbide and carbides such as Nb, Mo, W, and V are generated in the weld metal, and extremely high hardness is exhibited. The minimum hardness of the Vickers hardness HV with a load of 10 kg is 882, the maximum hardness is 960, and the average hardness is 921. In addition, HV is represented by a constant x a test force / a surface area of a dent (constant = 0.102).
次に、図4に示すエンドレスエメリー試験装置32を用いて、肉盛部19〜21の摩耗試験結果を示す。なお、図4において、33はベルト(SiC、#40)、34は試験片、35はストッパー、36はホルダーを示す。結果は図5に示す通りであった。即ち、SS400の摩耗量を1とすると、肉盛部19〜21の摩耗量は0.012であった。なお、HCRは、この肉盛溶接に使用した高クロム鋳鉄系のフィラー入りワイヤを示す。表1には、種々のHCRを用いて溶接した肉盛部19〜21の溶着金属の成分を示す。 Next, the wear test results of the built-up portions 19 to 21 will be shown using the endless emery test device 32 shown in FIG. In FIG. 4, 33 is a belt (SiC, # 40), 34 is a test piece, 35 is a stopper, and 36 is a holder. The result was as shown in FIG. That is, assuming that the wear amount of SS400 is 1, the wear amount of the built-up portions 19 to 21 was 0.012. HCR represents a high-chromium cast iron filler-containing wire used for this overlay welding. Table 1 shows the components of the deposited metal of the built-up portions 19 to 21 welded using various HCRs.
この表1から、溶着金属はCが5〜6.5wt%、Siが1.9〜2.3wt%、Mnが0.3〜0.45wt%、Crが22〜26wt%、Moが0又は0を超え5wt%、Vが0又は0を超え1.2wt%、Nbが3〜7wt%、Wが0又は0を超え4.5wt%の範囲であればよいことが判る。 From Table 1, the weld metal is 5 to 6.5 wt% C, Si 1.9 to 2.3 wt%, Mn 0.3 to 0.45 wt%, Cr 22 to 26 wt%, Mo 0 or It can be seen that it may be in the range of more than 0 and 5 wt%, V of 0 or more than 0 and 1.2 wt%, Nb of 3 to 7 wt%, and W of 0 or more than 0 and 4.5 wt%.
次に、図6、図7(A)、(B)を参照しながら、本発明の第2の実施例に係る曲面の肉盛溶接方法について説明する。図1〜図5に示した第1の実施例と同一の構成要素については同一の番号を付して詳しい説明を省略する。
図6に示すように、ランス38は直管領域11と先部の折れ曲がり領域12を有して、各直線領域11及び折れ曲がり領域12は、外側が耐火物13で覆われ、内部は内管14(一部又は全部が曲面からなる鋼構造物である鋼管の一例)と外管15の二重管構造となっている。
Next, a curved surface overlay welding method according to a second embodiment of the present invention will be described with reference to FIGS. 6, 7 </ b> A, and 7 </ b> B. The same components as those in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals and detailed description thereof is omitted.
As shown in FIG. 6, the lance 38 has a straight tube region 11 and a bent region 12 at the tip, and each straight region 11 and the bent region 12 are covered with a refractory 13 on the outside, and the inner tube 14 is formed on the inside. A double pipe structure of an outer pipe 15 and an example of a steel pipe that is a steel structure partly or entirely made of a curved surface.
内管14及び外管15の間にプロパンガスが流れ、内管14の内部に添加材が気流搬送される構造となっていることは第1の実施例と同様である。
図7(A)、(B)に示すように、内管14の屈曲部分16の内側面18には、内側円筒部の稜線、即ち、屈曲部分16の半径方向外側稜線40を中心としてその円周方向両側に例えば、90〜135度(合計で180〜270度の被溶接領域となる)広がった高クロム鋳鉄による肉盛部41〜43が形成されている。この肉盛部41〜43の厚みは例えば3〜4mmとなっているが、本発明はこの数字には限定されない。
Similar to the first embodiment, propane gas flows between the inner tube 14 and the outer tube 15, and the additive material is air-conveyed inside the inner tube 14.
As shown in FIGS. 7A and 7B, the inner side surface 18 of the bent portion 16 of the inner tube 14 has a circle centered on the ridgeline of the inner cylindrical portion, that is, the radially outer ridgeline 40 of the bent portion 16. Overlaying portions 41 to 43 made of high chromium cast iron that are spread, for example, by 90 to 135 degrees (a total welded area of 180 to 270 degrees) are formed on both sides in the circumferential direction. Although the thickness of this built-up part 41-43 is 3-4 mm, for example, this invention is not limited to this figure.
この肉盛部41〜43の形成にあっては、図7(A)に示すように、第1、第2の直管23、24及びエルボ25が溶接接合されていない状態で、第1の直管(内管)23の管端から5〜15mmの内側位置に幅8〜15mmの網材の一例である鋼製のエキスパンドメタル45(図8(A)参照)を、例えば210〜220度の角度で円弧状に曲げた状態で配置し、溶接にて仮止めする。この状態で、エキスパンドメタル45の上からクロム鋳鉄系金属の肉盛溶接を行う。 In the formation of the built-up portions 41 to 43, as shown in FIG. 7A, the first and second straight pipes 23 and 24 and the elbow 25 are not joined by welding. A steel expanded metal 45 (see FIG. 8A), which is an example of a mesh material having a width of 8 to 15 mm, is placed at an inner position of 5 to 15 mm from the pipe end of the straight pipe (inner pipe) 23, for example, 210 to 220 degrees. It arrange | positions in the state bent in the circular arc shape at the angle of, and is temporarily fixed by welding. In this state, build-up welding of a chromium cast iron metal is performed from above the expanded metal 45.
また、図7(A)に示すように、エルボ(内管)25の内側面18で曲がり半径が大きい部分(即ち、半径方向外側領域)に、両端部から5〜15mmの隙間を設けて、210〜220度位置に合わせて成形したエキスパンドメタル46(図8(B)参照)を配置し、溶接にて仮止めする。この状態で、エキスパンドメタル46の上からクロム鋳鉄系金属の肉盛溶接を行う。 Moreover, as shown to FIG. 7 (A), the clearance gap of 5-15 mm from both ends is provided in the part (namely, radial direction outer area | region) with a large bending radius in the inner surface 18 of the elbow (inner tube) 25, An expanded metal 46 (see FIG. 8 (B)) molded in accordance with the position of 210 to 220 degrees is placed and temporarily fixed by welding. In this state, build-up welding of a chrome cast iron metal is performed from above the expanded metal 46.
そして、肉盛部43の形成にあっては、図7(B)に示すように、第2の直管24の管端から5〜15mmの内側位置に幅8〜15mmの網材の一例である鋼製のエキスパンドメタル47(図8(C)参照)を、例えば260〜270度の角度で円弧状に曲げた状態で配置し、溶接にて仮止めする。この状態で、エキスパンドメタル47の上からクロム鋳鉄系金属の肉盛溶接を行う。なお、エキスパンドメタル45〜47は前記第1の実施例で説明したものと同一のものを使用する。 And in formation of the build-up part 43, as shown in FIG.7 (B), it is an example of the net | network material of width 8-15mm in the inner position 5-15mm from the pipe end of the 2nd straight pipe 24. A certain steel expanded metal 47 (see FIG. 8C) is arranged in a state of being bent in an arc shape at an angle of 260 to 270 degrees, for example, and temporarily fixed by welding. In this state, build-up welding of a chromium cast iron metal is performed from above the expanded metal 47. The expanded metals 45 to 47 are the same as those described in the first embodiment.
肉盛部43の領域が肉盛部41、42の領域より円周方向に広くなっているのは、この部分で添加材の流れが広がり、220度を超える非肉盛部の摩耗が激しくなるからである。高クロム鋳鉄系金属の溶材としては高クロム鋳鉄系のフラックス入りワイヤを用い、炭酸ガスアーク溶接法で肉盛溶接を行う。これによって、内管14の内側表面が溶融し、エキスパンドメタル45〜47も部分的に溶融するが、エキスパンドメタル45〜47の各線材が堰を形成し、溶融金属の流れを制止する。その他の溶接条件、作用については第1の実施例に係る曲面の肉盛溶接方法と同一である。 The reason why the area of the built-up part 43 is wider in the circumferential direction than the areas of the built-up parts 41 and 42 is that the flow of the additive material spreads in this part, and the wear of the non-build-up part exceeding 220 degrees becomes severe. Because. As a high chromium cast iron metal melt, high chromium cast iron flux cored wire is used, and overlay welding is performed by a carbon dioxide arc welding method. As a result, the inner surface of the inner tube 14 is melted, and the expanded metals 45 to 47 are partially melted. However, each wire of the expanded metals 45 to 47 forms a weir and restricts the flow of the molten metal. Other welding conditions and actions are the same as those of the curved surface overlay welding method according to the first embodiment.
この曲面の肉盛溶接方法を用いてランスを製造するが、屈曲部分に上記した方法による肉盛溶接を行う以外は、日本国特許公開2011−17529号公報、日本国特許公開2010−222592号公報等でも知られた周知方法であるので、詳しい説明を省略する。
また、肉盛部19〜21、41〜43の一部(例えば、肉盛部20、42)又は全部の表面に不定形耐火材を被覆することもでき、これによってランスの寿命の延長を図ることができる。この場合の不定形耐火材としては、周知のアルミナとシリカの粉体及び必要なバインダーを原料とするのが好ましい。
A lance is manufactured by using this curved surface overlay welding method, except for performing overlay welding by the above-described method on the bent portion, Japanese Patent Publication No. 2011-17529, Japanese Patent Publication No. 2010-222592. Since it is a well-known method also known in the art, detailed description is omitted.
In addition, it is possible to cover a part of the built-up portions 19 to 21 and 41 to 43 (for example, the built-up portions 20 and 42) or the entire surface with an amorphous refractory material, thereby extending the life of the lance. be able to. In this case, the amorphous refractory material is preferably made of known alumina and silica powder and a necessary binder.
本発明は前記した実施例に限定されるものではなく、例えば、肉盛部を形成する溶接金属は、耐熱耐摩耗性を有するものであれば、他の溶材を使用することもできる。また、前記実施例は数値を限定して説明したが、本発明は実施例に記載の数値に限定されるものではない。
更に、前記実施例では、ランスの内管に限定して説明したが、パイプ以外の曲面に肉盛をする場合にも本発明は適用できる。また、パイプの内面に肉盛した後で、肉盛表面や、肉盛した部分のパイプの外側又は内側に、耐熱性又は耐摩耗性を有する溶射皮膜を形成することもできる。
そして、前記実施例においては、網材として鋼製のエキスパンドメタルを用いたが、その他の金網、場合によってはステンレス製のエキスパンドメタル、あるいは鉄製又はステンレス製の金網を用いることもできる。
The present invention is not limited to the above-described embodiments. For example, as long as the weld metal forming the build-up portion has heat resistance and wear resistance, other melt materials can be used. Moreover, although the said Example restrict | limited and demonstrated the numerical value, this invention is not limited to the numerical value as described in an Example.
Furthermore, in the said Example, although limited and demonstrated to the inner pipe | tube of a lance, this invention is applicable also when building up on curved surfaces other than a pipe. In addition, after depositing on the inner surface of the pipe, a thermal spray coating having heat resistance or wear resistance can be formed on the cladding surface or on the outside or inside of the pipe of the overlay.
In the above embodiment, steel expanded metal is used as the mesh material. However, other metal meshes, and in some cases, stainless steel expanded metal, or iron or stainless steel wire mesh can also be used.
10:ランス、11:直管領域、12:折れ曲がり領域、13:耐火物、14:内管、15:外管、16:屈曲部分、18:内側面、19〜21:肉盛部、23:第1の直管、24:第2の直管、25:エルボ、26、27:溶接部、29〜31:エキスパンドメタル、32:エンドレスエメリー試験装置、33:ベルト、34:試験片、35:ストッパー、36:ホルダー、38:ランス、40:半径方向外側稜線、41〜43:肉盛部、45〜47:エキスパンドメタル 10: Lance, 11: Straight pipe region, 12: Bending region, 13: Refractory material, 14: Inner tube, 15: Outer tube, 16: Bent part, 18: Inner side surface, 19-21: Overlaying part, 23: First straight pipe, 24: second straight pipe, 25: elbow, 26, 27: welded part, 29-31: expanded metal, 32: endless emery test device, 33: belt, 34: test piece, 35: Stopper, 36: holder, 38: lance, 40: radially outer ridge line, 41-43: overlay, 45-47: expanded metal

Claims (9)

  1. 一部又は全部が曲面からなる鋼構造物の被溶接領域に、鉄製又はステンレス製の網材を仮止めする第1工程と、前記網材の上から肉盛溶接を行う第2工程とを有することを特徴とする曲面の肉盛溶接方法。 A first step of temporarily fixing an iron or stainless steel mesh material to a welded region of a steel structure partly or entirely of a curved surface; and a second step of performing overlay welding from above the mesh material. A method of overlay welding of curved surfaces characterized by the above.
  2. 請求項1記載の曲面の肉盛溶接方法において、前記網材は、鋼製のエキスパンドメタルであることを特徴とする曲面の肉盛溶接方法。 2. The curved surface overlay welding method according to claim 1, wherein the mesh material is a steel expanded metal.
  3. 請求項1又は2記載の曲面の肉盛溶接方法であって、前記鋼構造物は炭素鋼であって、前記肉盛溶接を行う溶材は、耐熱耐摩耗性を有する高クロム鋳鉄系のワイヤであることを特徴とする曲面の肉盛溶接方法。 3. The curved surface overlay welding method according to claim 1 or 2, wherein the steel structure is carbon steel, and the molten material for the overlay welding is a high chromium cast iron-based wire having heat resistance and wear resistance. A method of overlay welding of a curved surface, characterized in that there is.
  4. 請求項1〜3のいずれか1項に記載の曲面の肉盛溶接方法において、前記鋼構造物は鋼管であって、前記被溶接領域は該鋼管の内側面であることを特徴とする曲面の肉盛溶接方法。 The curved surface overlay welding method according to any one of claims 1 to 3, wherein the steel structure is a steel pipe, and the welded region is an inner surface of the steel pipe. Overlay welding method.
  5. 請求項4記載の曲面の肉盛溶接方法において、前記鋼管は製鉄所で用いる溶融金属に添加材を吹き込むランスであって、前記被溶接領域は前記ランスの屈曲部分の半径方向外側領域であることを特徴とする曲面の肉盛溶接方法。 5. The curved surface overlay welding method according to claim 4, wherein the steel pipe is a lance for blowing an additive into a molten metal used in an ironworks, and the welded region is a radially outer region of a bent portion of the lance. A curved surface overlay welding method characterized by
  6. 請求項5記載の曲面の肉盛溶接方法において、前記被溶接領域は前記ランスの屈曲部分の半径方向外側稜線を中心にして180度以上の範囲であることを特徴とする曲面の肉盛溶接方法。 6. The method of overlay welding of curved surface according to claim 5, wherein the welded region is in a range of 180 degrees or more around a radially outer ridge line of the bent portion of the lance. .
  7. 請求項5又は6記載の曲面の肉盛溶接方法において、前記ランスの屈曲部分は、曲がり管と該曲がり管の端部に溶接される第1、第2の直管の一部からなって、前記被溶接領域は、前記第1、第2の直管と前記曲がり管との溶接部を除く、前記曲がり管と前記第1、第2の直管の前記溶接部近傍の領域であることを特徴とする曲面の肉盛溶接方法。 The curved surface overlay welding method according to claim 5 or 6, wherein the bent portion of the lance is composed of a bent pipe and a part of the first and second straight pipes welded to the end of the bent pipe. The welded region is a region in the vicinity of the welded portion of the bent pipe and the first and second straight pipes, excluding a welded portion of the first and second straight pipes and the bent pipe. Characteristic curved surface overlay welding method.
  8. 請求項5〜7のいずれか1項に記載の曲面の肉盛溶接方法を適用したことを特徴とするランスの製造方法。 A method for manufacturing a lance, wherein the method for overlay welding of curved surfaces according to any one of claims 5 to 7 is applied.
  9. 請求項8記載のランスの製造方法において、前記肉盛溶接の表面を更に不定形耐火材で覆うことを特徴とするランスの製造方法。 9. The method of manufacturing a lance according to claim 8, wherein a surface of the overlay welding is further covered with an irregular refractory material.
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