JP5940311B2 - Joining method and joining structure - Google Patents

Joining method and joining structure Download PDF

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JP5940311B2
JP5940311B2 JP2012012446A JP2012012446A JP5940311B2 JP 5940311 B2 JP5940311 B2 JP 5940311B2 JP 2012012446 A JP2012012446 A JP 2012012446A JP 2012012446 A JP2012012446 A JP 2012012446A JP 5940311 B2 JP5940311 B2 JP 5940311B2
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dissimilar metal
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宣隆 中島
宣隆 中島
泰助 伊東
泰助 伊東
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Mitsubishi Heavy Industries Ltd
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Description

本発明は、低合金鋼の母材に対して異材金属を溶接接合するための接合方法、および当該接合方法により接合された接合構造に関するものである。   The present invention relates to a joining method for welding a dissimilar metal to a base material of a low alloy steel, and a joining structure joined by the joining method.

従来、例えば、特許文献１に記載されているように、低合金鋼（２.２５Ｃｒ−１Ｍｏ鋼）の溶接施工において、予熱温度を高めることが一般的に行われている。予熱温度を高めることは、溶接部の発生残留応力を低減できると共に延性を高めるのに効果がある。   Conventionally, for example, as described in Patent Document 1, in pre-welding of low alloy steel (2.25Cr-1Mo steel), it is generally performed to increase the preheating temperature. Increasing the preheating temperature is effective in reducing the residual stress generated in the weld and increasing the ductility.

特開平１０−２０４５４４号公報JP-A-10-204544

ところで、例えば、原子力設備に適用される蒸気発生器を製造する場合、円筒状の胴部の真円度を維持するために、当該胴部の内周面に補強金物を仮設している。胴部は低合金鋼が用いられ、補強金物は比較的安価な炭素鋼が用いられる。そして、上述したように、低合金鋼の溶接においては、予熱をする必要があり、補強金物を胴部に溶接する場合、胴部および補強金物の予熱（例えば、１５０℃）を伴うことになる。このように、胴部の囲まれた空間内において胴部および補強金物の予熱を行う作業は、作業環境および作業性が悪く作業者の負担が大きい。よって、作業性を向上することが望まれている。   By the way, for example, when manufacturing the steam generator applied to a nuclear facility, in order to maintain the roundness of a cylindrical trunk | drum, the reinforcement metal object is temporarily installed in the internal peripheral surface of the said trunk | drum. Low-alloy steel is used for the body, and relatively inexpensive carbon steel is used for the reinforcement hardware. As described above, in the welding of the low alloy steel, it is necessary to preheat, and when the reinforcing hardware is welded to the body, the body and the reinforcing hardware are preheated (for example, 150 ° C.). . Thus, the work of preheating the body part and the reinforcing hardware in the space surrounded by the body part is poor in work environment and workability, and the burden on the operator is large. Therefore, it is desired to improve workability.

本発明は、上述した課題を解決するものであり、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することのできる接合方法および接合構造を提供することを目的とする。   This invention solves the subject mentioned above, and it aims at providing the joining method and joining structure which can improve the workability | operativity which welds the joining metal of a dissimilar metal to low alloy steel.

上述の目的を達成するために、本発明の接合方法は、低合金鋼の母材に対して材料の異なる異材金属の接合金物を溶接接合する接合方法において、前記母材側の接合面に低合金鋼の肉盛溶接を行う工程と、次に、前記低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う工程と、次に、前記異材金属の肉盛溶接に対して異材金属の溶加材により前記接合金物を溶接接合する工程と、を含み、前記接合金物を溶接接合する工程では、前記異材金属の肉盛溶接に対して異材金属の溶加材により異材金属の位置決め部材を溶接接合し、当該位置決め部材に対して異材金属の溶加材により前記接合金物を溶接接合することを特徴とする。 In order to achieve the above-described object, the joining method of the present invention is a joining method of welding a dissimilar metal joint metal made of different materials to a base material of low alloy steel. For the build-up welding of the alloy steel, and then for the build-up welding of the dissimilar metal on the build-up welding surface of the low alloy steel, and then for the build-up welding of the dissimilar metal It is seen containing a step of welding the joint hardware by dissimilar metal filler, and in the step of welding the bonding hardware, dissimilar metal by filler of the dissimilar metals with respect to overlay welding of the dissimilar metal The positioning member is welded and joined to the positioning member with a filler metal of a dissimilar metal .

この接合方法によれば、母材側の接合面に低合金鋼の肉盛溶接を行う工程、および低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う工程は、予熱が必要であるが、異材金属の肉盛溶接に対して接合金物を溶接接合する工程では、予熱が不要となる。この結果、接合金物自体を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することができる。   According to this joining method, preheating is performed in the process of overlay welding of low alloy steel on the joint surface on the base metal side and the process of overlay welding of dissimilar metal on the overlay weld surface of low alloy steel. Although it is necessary, preheating is not required in the process of welding and joining the joint metal to the overlay welding of the dissimilar metal. As a result, since the joining hardware itself is not preheated, the workability of welding the joining material of the dissimilar metal to the low alloy steel can be improved.

この接合方法によれば、異材金属の肉盛溶接に対して位置決め部材を溶接接合する際、および位置決め部材に接合金物を溶接接合する際には、予熱が不要となる。この結果、位置決め部材や接合金物を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することができる。しかも、位置決め部材により接合金物の接合位置の位置決めを行うことができる。さらに、接合金物を母材から取り外す場合、異材金属の肉盛溶接に対する位置決め部材の溶接箇所である溶加材部分を削除することで、接合金物を母材から容易に取り外すことができる。   According to this joining method, preheating is not required when the positioning member is welded and joined to the overlay welding of the dissimilar metal, and when the joining hardware is welded and joined to the positioning member. As a result, since the positioning member and the joint metal are not preheated, the workability of welding and joining the dissimilar metal joint metal to the low alloy steel can be improved. In addition, the bonding position of the bonding hardware can be determined by the positioning member. Furthermore, when removing the joining hardware from the base material, the joining hardware can be easily detached from the base material by deleting the filler material portion that is the welding location of the positioning member for the overlay welding of the dissimilar metal.

上述の目的を達成するために、本発明の接合構造は、低合金鋼の母材と、前記母材側の接合面に接合した低合金綱層と、低合金鋼に対して材料の異なる異材金属からなり前記低合金鋼層の上に接合した異材金属層と、前記異種金属層に対して異材金属の溶加材により接合した異材金属の位置決め部材と、当該位置決め部材に対して異材金属の溶加材により接合して前記位置決め部材と前記異材金属層と前記低合金綱層とを介して前記母材に接合した異材金属の接合金物と、を備えることを特徴とする。 In order to achieve the above-described object, the joining structure of the present invention includes a base material of low alloy steel , a low alloy steel layer joined to the joining surface on the base material side, and a dissimilar material having a material different from that of the low alloy steel. a dissimilar metal layer bonded onto said low alloy steel layer made of a metal, a positioning member of the dissimilar metal joined by filler of the dissimilar metal to the different metal layer, the dissimilar metal with respect to the positioning member And a dissimilar metal joint hardware joined to the base material via the positioning member, the dissimilar metal layer, and the low alloy steel layer .

この接合構造によれば、母材側の接合面への低合金鋼層の肉盛溶接や、低合金鋼層への異材金属層の肉盛溶接について、予熱が必要であるが、異材金属層への接合金物の溶接接合については、予熱が不要となる。この結果、接合金物自体を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することができる。   According to this joining structure, preheating is necessary for overlay welding of a low alloy steel layer to the joint surface on the base metal side and overlay welding of a dissimilar metal layer to the low alloy steel layer. No preheating is required for the welded joint of the metal fitting to the joint. As a result, since the joining hardware itself is not preheated, the workability of welding the joining material of the dissimilar metal to the low alloy steel can be improved.

この接合構造によれば、異材金属層への位置決め部材の溶接接合や、位置決め部材への接合金物の溶接接合について、予熱が不要となる。この結果、位置決め部材や接合金物を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することができる。しかも、位置決め部材により接合金物の接合位置の位置決めをすることができる。さらに、接合金物を母材から取り外す場合、異材金属層に対する位置決め部材の溶接箇所である溶加材部分を削除することで、接合金物を母材から容易に取り外すことができる。   According to this joining structure, preheating is not required for welding joining of the positioning member to the dissimilar metal layer and welding joining of the joint metal to the positioning member. As a result, since the positioning member and the joint metal are not preheated, the workability of welding and joining the dissimilar metal joint metal to the low alloy steel can be improved. In addition, the bonding position of the bonding hardware can be determined by the positioning member. Furthermore, when removing the joining hardware from the base material, the joining hardware can be easily detached from the base material by deleting the filler material portion that is the welded portion of the positioning member to the dissimilar metal layer.

本発明によれば、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することができる。   ADVANTAGE OF THE INVENTION According to this invention, the workability | operativity which weld-joins the metal joint of dissimilar metal to low alloy steel can be improved.

図１は、本発明の実施の形態に係る接合構造の断面図である。FIG. 1 is a cross-sectional view of a joint structure according to an embodiment of the present invention. 図２は、本発明の実施の形態に係る接合構造の正面図である。FIG. 2 is a front view of the joint structure according to the embodiment of the present invention. 図３は、本発明の実施の形態に係る他の接合構造の断面図である。FIG. 3 is a cross-sectional view of another joint structure according to the embodiment of the present invention. 図４は、本発明の実施の形態に係る接合方法の工程図である。FIG. 4 is a process diagram of the bonding method according to the embodiment of the present invention. 図５は、本発明の実施の形態に係る接合方法の工程図である。FIG. 5 is a process diagram of the bonding method according to the embodiment of the present invention. 図６は、本発明の実施の形態に係る接合方法の工程図である。FIG. 6 is a process diagram of the bonding method according to the embodiment of the present invention. 図７は、本発明の実施の形態に係る接合構造が適用される蒸気発生器の構成を示す説明図である。FIG. 7 is an explanatory diagram showing a configuration of a steam generator to which the joining structure according to the embodiment of the present invention is applied. 図８は、本発明の実施の形態に係る接合構造を適用した蒸気発生器の製造時の側面図である。FIG. 8 is a side view at the time of manufacturing the steam generator to which the joining structure according to the embodiment of the present invention is applied. 図９は、本発明の実施の形態に係る接合構造を適用した蒸気発生器の製造時の正面図である。FIG. 9 is a front view at the time of manufacture of the steam generator to which the joining structure according to the embodiment of the present invention is applied.

以下に、本発明に係る実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。また、下記実施の形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

図７は、本実施の形態に係る接合構造が適用される蒸気発生器の構成を示す説明図である。蒸気発生器１０１は、例えば、加圧水型原子炉（ＰＷＲ：Pressurized Water Reactor）に用いられる。加圧水型原子炉は、原子炉冷却材および中性子減速材として軽水を使用している。加圧水型原子炉は、軽水を炉心全体にわたって沸騰しない高温高圧水としての一次冷却水を蒸気発生器１０１に送る。蒸気発生器１０１では、高温高圧の一次冷却水の熱を二次冷却水に伝え、二次冷却水に水蒸気を発生させる。そして、この水蒸気によりタービン発電機が回されて発電する。   FIG. 7 is an explanatory diagram showing a configuration of a steam generator to which the joining structure according to the present embodiment is applied. The steam generator 101 is used, for example, in a pressurized water reactor (PWR: Pressurized Water Reactor). The pressurized water reactor uses light water as a reactor coolant and neutron moderator. The pressurized water reactor sends primary cooling water to the steam generator 101 as high-temperature high-pressure water that does not boil light water over the entire core. In the steam generator 101, the heat of the high-temperature and high-pressure primary cooling water is transmitted to the secondary cooling water, and water vapor is generated in the secondary cooling water. Then, the steam generator is rotated by this steam to generate electricity.

蒸気発生器１０１は、胴部１０２を有している。胴部１０２は、上下方向に延在され、かつ密閉された中空円筒形状をなし、上半部に対して下半部が若干小径とされている。胴部１０２は、その下半部内に、当該胴部１０２の内壁面と所定間隔をもって配置された円筒形状をなす管群外筒１０３が設けられている。この管群外筒１０３は、その下端部が、胴部１０２の下半部内の下方に配置された管板１０４近傍まで延設されている。管群外筒１０３内には、伝熱管群１０５Ａが設けられている。伝熱管群１０５Ａは、逆Ｕ字形状をなす複数の伝熱管１０５からなる。伝熱管群１０５Ａは、その上端部に、伝熱管１０５の上述した逆Ｕ字形状の円弧部が配置されている。伝熱管１０５は、中央から外側に向けて円弧部の径が大きなものを配列した伝熱管層を構成し、この伝熱管層を、重ねつつ径を変えることで、伝熱管群１０５Ａの上端部を半球形状に形成している。この伝熱管群１０５Ａの半球形状部分は、各伝熱管層の円弧部の間に、一次冷却水が各伝熱管１０５内を通過する際に発生し得る流体励起振動を抑制するための振止部材１０５ａが設けられている。そして、各伝熱管１０５は、Ｕ字形状の円弧部を上方に向け、下端部が管板１０４の管穴１０４ａに挿通支持されていると共に、中間部が複数の管支持板１０６を介して管群外筒１０３に支持されている。管支持板１０６は、多数の管穴１０６ａが形成されており、この管穴１０６ａに各伝熱管１０５が挿通されることで各伝熱管１０５を支持する。   The steam generator 101 has a trunk portion 102. The trunk portion 102 has a hollow cylindrical shape that extends in the vertical direction and is hermetically sealed. The lower half portion has a slightly smaller diameter than the upper half portion. The trunk portion 102 is provided with a tube group outer cylinder 103 having a cylindrical shape disposed at a predetermined distance from the inner wall surface of the trunk portion 102 in the lower half portion thereof. The lower end portion of the tube group outer tube 103 extends to the vicinity of the tube plate 104 disposed below in the lower half of the body portion 102. A heat transfer tube group 105 </ b> A is provided in the tube group outer tube 103. The heat transfer tube group 105A includes a plurality of heat transfer tubes 105 having an inverted U shape. In the heat transfer tube group 105A, the above-described inverted U-shaped arc portion of the heat transfer tube 105 is arranged at the upper end portion thereof. The heat transfer tube 105 constitutes a heat transfer tube layer in which the arc portions having large diameters are arranged from the center toward the outside, and the upper end portion of the heat transfer tube group 105A is changed by changing the diameter while overlapping the heat transfer tube layers. It has a hemispherical shape. The hemispherical portion of the heat transfer tube group 105A is a bracing member for suppressing fluid excitation vibration that may occur when the primary cooling water passes through the heat transfer tubes 105 between the arc portions of the heat transfer tube layers. 105a is provided. Each heat transfer tube 105 has a U-shaped arc portion facing upward, a lower end portion is inserted and supported in the tube hole 104a of the tube plate 104, and an intermediate portion is connected to the tube via a plurality of tube support plates 106. It is supported by the group outer cylinder 103. The tube support plate 106 is formed with a large number of tube holes 106a, and the heat transfer tubes 105 are inserted into the tube holes 106a to support the heat transfer tubes 105.

胴部１０２は、その下端部に水室１０７が設けられている。水室１０７は、内部が隔壁１０８により入室１０７Ａと出室１０７Ｂとに区画されている。入室１０７Ａは、各伝熱管１０５の一端部が連通され、出室１０７Ｂは、各伝熱管１０５の他端部が連通されている。また、入室１０７Ａは、胴部１０２の外部に通じる入口ノズル１０７Ａａが形成され、出室１０７Ｂは、胴部１０２の外部に通じる出口ノズル１０７Ｂａが形成されている。そして、入口ノズル１０７Ａａは、加圧水型原子炉から一次冷却水が送られる冷却水配管（図示せず）が連結され、出口ノズル１０７Ｂａは、熱交換された後の一次冷却水を加圧水型原子炉に送る冷却水配管（図示せず）が連結される。   The body 102 is provided with a water chamber 107 at its lower end. The water chamber 107 is divided into an entrance chamber 107A and an exit chamber 107B by a partition wall 108. One end of each heat transfer tube 105 communicates with the entrance chamber 107A, and the other end of each heat transfer tube 105 communicates with the exit chamber 107B. The entrance chamber 107A is formed with an inlet nozzle 107Aa that communicates with the outside of the body portion 102, and the exit chamber 107B is formed with an exit nozzle 107Ba that communicates with the outside of the body portion 102. The inlet nozzle 107Aa is connected to a cooling water pipe (not shown) through which primary cooling water is sent from the pressurized water reactor, and the outlet nozzle 107Ba sends the primary cooling water after heat exchange to the pressurized water reactor. The cooling water piping (not shown) to send is connected.

胴部１０２は、その上半部内に、給水を蒸気と熱水とに分離する気水分離器１０９、および分離された蒸気の湿分を除去して乾き蒸気に近い状態とする湿分分離器１１０が設けられている。気水分離器１０９と伝熱管群１０５Ａとの間には、外部から胴部１０２内に二次冷却水の給水を行う給水管１１１が挿入されている。さらに、胴部１０２は、その上端部に、蒸気排出口１１２が形成されている。また、胴部１０２は、その下半部内に、給水管１１１からこの胴部１０２内に給水された二次冷却水を、胴部１０２と管群外筒１０３との間を流下させて管板１０４にて折り返させ、伝熱管群１０５Ａに沿って上昇させる給水路１１３が形成されている。なお、蒸気排出口１１２は、タービンに蒸気を送る冷却水配管（図示せず）が連結され、給水管１１１は、タービンで使用された蒸気が復水器（図示せず）で冷却された二次冷却水を供給するための冷却水配管（図示せず）が連結される。   In the upper half of the body portion 102, a steam separator 109 that separates the feed water into steam and hot water, and a moisture separator that removes the moisture from the separated steam and makes it close to dry steam. 110 is provided. Between the steam separator 109 and the heat transfer tube group 105A, a water supply pipe 111 for supplying secondary cooling water from the outside into the body portion 102 is inserted. Further, the body 102 has a steam discharge port 112 formed at the upper end thereof. In addition, the body portion 102 has a pipe plate in which the secondary cooling water supplied from the water supply pipe 111 into the body portion 102 flows between the body portion 102 and the tube group outer cylinder 103 in the lower half portion thereof. A water supply passage 113 is formed that is folded back at 104 and raised along the heat transfer tube group 105A. The steam outlet 112 is connected to a cooling water pipe (not shown) for sending steam to the turbine, and the water supply pipe 111 is a two-way steam that has been cooled by a condenser (not shown). A cooling water pipe (not shown) for supplying the next cooling water is connected.

このような蒸気発生器１０１では、加圧水型原子炉で加熱された一次冷却水は、入室１０７Ａに送られ、多数の伝熱管１０５内を通って循環して出室１０７Ｂに至る。一方、復水器で冷却された二次冷却水は、給水管１１１に送られ、胴部１０２内の給水路１１３を通って伝熱管群１０５Ａに沿って上昇する。このとき、胴部１０２内で、高圧高温の一次冷却水と二次冷却水との間で熱交換が行われる。そして、冷やされた一次冷却水は出室１０７Ｂから加圧水型原子炉に戻される。一方、高圧高温の一次冷却水と熱交換を行った二次冷却水は、胴部１０２内を上昇し、気水分離器１０９で蒸気と熱水とに分離される。そして、分離された蒸気は、湿分分離器１１０で湿分が除去されてからタービンに送られる。   In such a steam generator 101, the primary cooling water heated in the pressurized water reactor is sent to the entrance chamber 107A, circulates through the numerous heat transfer tubes 105, and reaches the exit chamber 107B. On the other hand, the secondary cooling water cooled by the condenser is sent to the water supply pipe 111 and rises along the heat transfer pipe group 105 </ b> A through the water supply path 113 in the trunk portion 102. At this time, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water in the body portion 102. Then, the cooled primary cooling water is returned to the pressurized water reactor from the exit chamber 107B. On the other hand, the secondary cooling water that has exchanged heat with the high-pressure and high-temperature primary cooling water rises in the body portion 102 and is separated into steam and hot water by the steam separator 109. The separated steam is sent to the turbine after moisture is removed by the moisture separator 110.

図８は、本実施の形態に係る接合構造を適用した蒸気発生器の製造時の説明図であり、図９は、本実施の形態に係る接合構造を適用した蒸気発生器の製造時の正面図である。   FIG. 8 is an explanatory diagram at the time of manufacturing the steam generator to which the joining structure according to the present embodiment is applied, and FIG. 9 is a front view at the time of manufacturing the steam generator to which the joining structure according to the present embodiment is applied. FIG.

上述した蒸気発生器１０１を製造するにあたり、胴部１０２は、図７に示すように、管群外筒１０３、伝熱管１０５、および管支持板１０６が収容される下半部胴１０２Ａと、気水分離器１０９、湿分分離器１１０、および給水管１１１が収容される上半部胴１０２Ｂとに分けて製造される。そして、下半部胴１０２Ａは、図８に示すように、管板１０４側から下部胴１０２ａ、中間胴１０２ｂ、および円錐胴１０２ｃに分割されて形成され、これらが管板１０４を含め一体に形成される。この一体に形成する際、下半部胴１０２Ａを母材１とし、図８および図９に示すように、下部胴１０２ａの管板１０４寄りの内周面、および中間胴１０２ｂの下部胴１０２ａ寄りの内周面に対し、下部胴１０２ａや中間胴１０２ｂの真円を維持するように周方向に複数（本実施の形態では４つ）の扇形補強板（接合金物）２が接合される。なお、図には明示しないが、上半部胴１０２Ｂは、気水分離器１０９、湿分分離器１１０、および給水管１１１が収容される上部胴と、蒸気排出口１１２が形成される上部蓋とを一体に形成する際、上半部胴１０２Ｂを母材１とし、下部胴の上部蓋寄りの内周面に対し、上部胴の真円を維持するように周方向に複数の扇形補強板である接合金物２が一時的に接合される。母材１は、胴部１０２の強度を十分に維持するために低合金鋼で形成され、接合金物２は製造時の一時的な接合であるために比較的安価な炭素鋼やステンレス鋼で形成されている。そして、接合金物２の母材１への接合は、図９に示すように、１つの接合金物２の複数箇所（本実施の形態では４箇所）において接合部３により接合される。   In manufacturing the steam generator 101 described above, as shown in FIG. 7, the barrel portion 102 includes a lower half barrel 102 </ b> A in which the tube group outer tube 103, the heat transfer tube 105, and the tube support plate 106 are accommodated. The water separator 109, the moisture separator 110, and the upper half barrel 102B in which the water supply pipe 111 is accommodated are manufactured. As shown in FIG. 8, the lower half cylinder 102A is divided into a lower cylinder 102a, an intermediate cylinder 102b, and a cone cylinder 102c from the tube plate 104 side, and these are integrally formed including the tube plate 104. Is done. When this is integrally formed, the lower half barrel 102A is used as the base material 1, and as shown in FIGS. 8 and 9, the inner circumferential surface of the lower barrel 102a near the tube plate 104 and the lower barrel 102a of the intermediate barrel 102b. A plurality of (four in the present embodiment) fan-shaped reinforcing plates (joint fittings) 2 are joined in the circumferential direction so as to maintain the perfect circles of the lower barrel 102a and the intermediate barrel 102b. Although not clearly shown in the drawing, the upper half barrel 102B includes an upper barrel in which the steam separator 109, the moisture separator 110, and the water supply pipe 111 are accommodated, and an upper lid in which the steam discharge port 112 is formed. Are formed as a base material 1, and a plurality of fan-shaped reinforcing plates are provided in the circumferential direction so as to maintain a perfect circle of the upper body with respect to the inner peripheral surface near the upper lid of the lower body. The joint hardware 2 is temporarily joined. The base material 1 is formed of low alloy steel in order to sufficiently maintain the strength of the body portion 102, and the joint hardware 2 is formed of relatively inexpensive carbon steel or stainless steel because it is a temporary joint at the time of manufacture. Has been. And as shown in FIG. 9, joining to the base material 1 of the metal fitting 2 is joined by the junction part 3 in the multiple places (4 places in this Embodiment) of the one metal fitting 2. As shown in FIG.

図１は、本実施の形態に係る接合構造の断面図であり、図２は、本実施の形態に係る接合構造の正面図である。また、図３は、本実施の形態に係る他の接合構造の断面図である。   FIG. 1 is a cross-sectional view of the joint structure according to the present embodiment, and FIG. 2 is a front view of the joint structure according to the present embodiment. FIG. 3 is a cross-sectional view of another joint structure according to the present embodiment.

図１および図２に示すように、本実施の形態の接合構造は、上述した接合部３の構造である。接合部３は、低合金鋼層３ａと、異材金属層３ｂとを含み構成されている。低合金鋼層３ａは、母材１側の接合面１ａに対して低合金鋼が溶加材として肉盛溶接されたものである。また、異材金属層３ｂは、低合金鋼層３ａの上に対して異材金属である炭素鋼またはステンレス鋼が溶加材として肉盛溶接されたものである。そして、異材金属層３ｂに対し、接合金物２が異材金属である炭素鋼またはステンレス鋼の溶加材３ｃ，３ｄにより溶接接合されている。なお、低合金鋼層３ａは、母材１である上半部胴１０２Ｂの内周面が周方向に円弧状に形成されているが、この円弧状を平坦状にするように上面が平坦に形成されている。また、本実施の形態の接合構造は、低合金鋼の母材１に異材金属を溶接接合するため、母材１の接合面１ａに低合金鋼層３ａを設けることで、母材１自体の溶融部分に異材金属が混入することを防ぐことになる。   As shown in FIGS. 1 and 2, the joint structure of the present embodiment is the structure of the joint portion 3 described above. The joint 3 includes a low alloy steel layer 3a and a dissimilar metal layer 3b. The low alloy steel layer 3a is obtained by overlay welding a low alloy steel as a filler metal to the joint surface 1a on the base material 1 side. In addition, the dissimilar metal layer 3b is obtained by overlay welding carbon steel or stainless steel, which is a dissimilar metal, on the low alloy steel layer 3a as a filler material. The metal joint 2 is welded and joined to the dissimilar metal layer 3b with carbon steel or stainless steel filler metals 3c and 3d which are dissimilar metals. In the low alloy steel layer 3a, the inner peripheral surface of the upper half barrel 102B which is the base material 1 is formed in an arc shape in the circumferential direction, but the upper surface is flat so as to make the arc shape flat. Is formed. Moreover, since the joining structure of this Embodiment welds and joins a dissimilar metal to the base material 1 of the low alloy steel, the low alloy steel layer 3a is provided on the joining surface 1a of the base material 1, thereby the base material 1 itself. This prevents the foreign metal from being mixed into the molten portion.

図１および図２において、接合金物２は、位置決め部材４を介して異材金属層３ｂに溶接接合されている。位置決め部材４は、異材金属である炭素鋼またはステンレス鋼により形成されたもので、異材金属層３ｂに対して溶加材３ｃにより溶接接合されている。そして、この位置決め部材４により母材１の所定位置に位置決めされるように、接合金物２が位置決め部材４に対して溶加材３ｄにより溶接接合されている。   In FIG. 1 and FIG. 2, the metal joint 2 is welded and joined to the dissimilar metal layer 3 b via the positioning member 4. The positioning member 4 is made of carbon steel or stainless steel, which is a dissimilar metal, and is welded and joined to the dissimilar metal layer 3b by a filler material 3c. The metal joint 2 is welded and joined to the positioning member 4 by a filler material 3d so that the positioning member 4 is positioned at a predetermined position of the base material 1.

また、図３において、接合金物２は、異材金属層３ｂに対して溶加材３ｃにより溶接接合されている。   In FIG. 3, the metal joint 2 is welded to the dissimilar metal layer 3b with a filler material 3c.

なお、接合金物２、異材金属層３ｂ、溶加材３ｃ，３ｄ、および位置決め部材４は、全てが異材金属である炭素鋼であっても、全てが異材金属であるステンレス鋼であってもよい。製造コストを低減するには、全てを安価である炭素鋼を適用することが好ましい。   Note that the metal joint 2, the dissimilar metal layer 3b, the filler metal 3c, 3d, and the positioning member 4 may be all carbon steel that is a dissimilar metal or stainless steel that is all a dissimilar metal. . In order to reduce the manufacturing cost, it is preferable to apply carbon steel which is inexpensive at all.

図４〜図６は、本実施の形態に係る接合方法の工程図である。まず、図４に示すように、母材１側の接合面１ａに対して低合金鋼の肉盛溶接を行う。すなわち、母材１の接合面１ａに低合金鋼層３ａが肉盛溶接される。この際、低合金鋼同士の溶接となるため、母材１の予熱を行う。   4 to 6 are process diagrams of the bonding method according to the present embodiment. First, as shown in FIG. 4, overlay welding of low alloy steel is performed on the joint surface 1 a on the base material 1 side. That is, the low alloy steel layer 3 a is overlay welded to the joint surface 1 a of the base material 1. At this time, since the low alloy steel is welded, the base material 1 is preheated.

次に、図５に示すように、低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う。すなわち、低合金鋼層３ａに対して異材金属層３ｂの肉盛溶接を行う。この際、低合金鋼を含む溶接となるため、低合金鋼層３ａの予熱を行う。   Next, as shown in FIG. 5, build-up welding of a dissimilar metal is performed on the build-up welding surface of the low alloy steel. That is, build-up welding of the dissimilar metal layer 3b is performed on the low alloy steel layer 3a. At this time, since the welding includes low alloy steel, the low alloy steel layer 3a is preheated.

次に、異材金属の肉盛溶接に対して接合金物２を溶接接合する。すなわち、異材金属層３ｂに対して接合金物２の溶接接合を行う。ここで、図１および図２に示す接合構造とする場合、図６に示すように、異材金属の肉盛溶接に対して異材金属の溶加材３ｃにより異材金属の位置決め部材４を溶接接合し、図１に示すように位置決め部材４に対して異材金属の溶加材３ｄにより接合金物２を溶接接合する。すなわち、図６に示すように、異材金属層３ｂに対して異材金属の溶加材３ｃにより位置決め部材４の溶接接合を行い、図１に示すように、位置決め部材４に対して異材金属の溶加材３ｄにより接合金物２の溶接接合を行う。異材金属層３ｂに対して異材金属の溶加材３ｃにより位置決め部材４を溶接接合する際、全てが異材金属同士であるため、予熱は必要ない。また、位置決め部材４に対して異材金属の溶加材３ｄにより接合金物２を溶接接合する際も、全てが異材金属同士であるため、予熱は必要ない。   Next, the metal joint 2 is welded to the overlay welding of the dissimilar metal. That is, the weld metal 2 is welded to the dissimilar metal layer 3b. When the joining structure shown in FIGS. 1 and 2 is adopted, as shown in FIG. 6, the dissimilar metal positioning member 4 is welded and joined to the dissimilar metal overlay welding by the dissimilar metal filler material 3c. As shown in FIG. 1, the metal joint 2 is welded to the positioning member 4 with a filler metal 3 d of a dissimilar metal. That is, as shown in FIG. 6, the positioning member 4 is welded to the dissimilar metal layer 3b with the dissimilar metal filler material 3c, and the dissimilar metal melt is bonded to the positioning member 4 as shown in FIG. The weld metal 2 is welded and joined by the additive 3d. When the positioning member 4 is welded to the dissimilar metal layer 3b with the filler metal 3c of dissimilar metal, since all are dissimilar metals, preheating is not necessary. In addition, when welding the metal joint 2 to the positioning member 4 with the filler metal 3d made of a different material, since all are made of different materials, preheating is not necessary.

なお、図３に示す接合構造とする場合、図３に示すように、異材金属の肉盛溶接に対して異材金属の溶加材３ｃにより接合金物２を溶接接合する。すなわち、異材金属層３ｂに対して異材金属の溶加材３ｃにより接合金物２の溶接接合を行う。異材金属層３ｂに対して異材金属の溶加材３ｃにより接合金物２を溶接接合する際、全てが異材金属同士であるため、予熱は必要ない。   In addition, when it is set as the joining structure shown in FIG. 3, as shown in FIG. 3, the joining metal object 2 is weld-joined with the filler material 3c of a dissimilar metal with respect to overlay welding of a dissimilar metal. That is, the joint metal 2 is welded to the dissimilar metal layer 3b with the filler metal 3c of the dissimilar metal. When welding the joining hardware 2 to the dissimilar metal layer 3b with the dissimilar metal filler material 3c, since all are dissimilar metals, preheating is not required.

このように、本実施の形態の接合方法は、低合金鋼の母材１に対して材料の異なる異材金属の接合金物２を溶接接合する接合方法において、母材１側の接合面１ａに低合金鋼の肉盛溶接を行う工程と、次に、低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う工程と、次に、異材金属の肉盛溶接に対して異材金属の溶加材により接合金物２を溶接接合する工程とを含む。   As described above, the joining method of the present embodiment is low in the joining surface 1a on the base material 1 side in the joining method of welding the dissimilar metal joining hardware 2 of different materials to the base material 1 of the low alloy steel. The process of overlay welding of alloy steel, then the process of overlay welding of dissimilar metal on the overlay welding surface of low alloy steel, and then dissimilar metal for overlay welding of dissimilar metal And a step of welding and joining the metal joint 2 with the filler material.

ここで、炭素鋼やステンレス鋼は、溶接時に予熱が不要であるが、低合金鋼は、応力割れを防ぐために予熱（例えば、１５０℃）が必要である。そして、炭素鋼やステンレス鋼の接合金物２を母材１に直接溶接するには、接合金物２および母材１を予熱する必要がある。また、母材１としての下半部胴１０２Ａは数千ｍｍの内径であり、この胴部１０２の内周面に接合されて胴部１０２を補強する接合金物２としての扇形補強板は、その重量が嵩むため、胴部１０２Ａの囲まれた空間内において予熱した扇型補強板を取り扱うことは、作業環境および作業性が悪く作業者の負担が大きい。この点、本実施の形態の接合方法によれば、母材１側の接合面１ａに低合金鋼の肉盛溶接を行う工程、および低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う工程は、予熱が必要であるが、異材金属の肉盛溶接に対して接合金物２を溶接接合する工程では、予熱が不要となる。この結果、接合金物２自体を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することが可能になる。   Here, carbon steel and stainless steel do not require preheating at the time of welding, but low alloy steel needs preheating (for example, 150 ° C.) to prevent stress cracking. And in order to weld the metal fitting 2 of carbon steel or stainless steel directly to the base material 1, it is necessary to preheat the joint metal 2 and the base material 1. Further, the lower half barrel 102A as the base material 1 has an inner diameter of several thousand mm, and the fan-shaped reinforcing plate as the joint hardware 2 joined to the inner peripheral surface of the barrel 102 to reinforce the barrel 102 is Since the weight is increased, handling the pre-heated fan-shaped reinforcing plate in the space surrounded by the trunk portion 102A is inferior in work environment and workability, and places a heavy burden on the operator. In this regard, according to the joining method of the present embodiment, the process of overlay welding of low alloy steel on the joint surface 1a on the base material 1 side, and the dissimilar metal on the overlay welding surface of the low alloy steel The step of performing the build-up welding requires preheating, but the step of welding and joining the metal joint 2 to the build-up welding of the dissimilar metal does not require preheating. As a result, since the joining hardware 2 itself is not preheated, it is possible to improve the workability of welding the joining material of the dissimilar metal to the low alloy steel.

また、本実施の形態の接合方法は、接合金物２を溶接接合する工程では、異材金属の肉盛溶接に対して異材金属の溶加材３ｃにより異材金属の位置決め部材４を溶接接合し、当該位置決め部材４に対して異材金属の溶加材３ｄにより接合金物２を溶接接合することが好ましい。   Further, in the joining method of the present embodiment, in the step of welding and joining the metal fitting 2, the dissimilar metal positioning member 4 is welded and joined to the overlay welding of the dissimilar metal with the filler metal 3 c of the dissimilar metal. It is preferable to weld-join the metal fitting 2 to the positioning member 4 with a filler metal 3d of a dissimilar metal.

この接合方法によれば、異材金属の肉盛溶接に対して位置決め部材４を溶接接合する際、および位置決め部材４に接合金物２を溶接接合する際には、予熱が不要となる。この結果、位置決め部材４や接合金物２を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することが可能になる。しかも、位置決め部材４により接合金物２の接合位置の位置決めを行うことが可能である。さらに、接合金物２を母材１から取り外す場合、異材金属の肉盛溶接に対する位置決め部材４の溶接箇所である溶加材３ｃ部分を削除することで、接合金物２を母材１から容易に取り外すことが可能である。   According to this joining method, preheating is not required when the positioning member 4 is welded and joined to the overlay welding of the dissimilar metal, and when the joining hardware 2 is welded and joined to the positioning member 4. As a result, since the positioning member 4 and the metal joint 2 are not preheated, it is possible to improve the workability of welding the metal alloy joint metal to the low alloy steel. In addition, it is possible to position the joining position of the joint hardware 2 by the positioning member 4. Furthermore, when removing the metal joint 2 from the base material 1, the metal joint 2 is easily removed from the base material 1 by deleting the filler material 3 c portion, which is the welded portion of the positioning member 4 for the overlay welding of the dissimilar metal. It is possible.

また、本実施の形態の接合構造は、低合金鋼の母材１に対して材料の異なる異材金属の接合金物２を溶接接合する接合構造において、母材１側の接合面１ａに肉盛溶接された低合金鋼層３ａと、低合金鋼層３ａの上に肉盛溶接された異材金属層３ｂと、を備え、異材金属層３ｂに対して異材金属の溶加材により接合金物２が溶接接合されている。   Moreover, the joining structure of this Embodiment is build-up welding to the joining surface 1a by the side of the base material 1 in the joining structure which welds and joins the dissimilar metal joint metal 2 with a different material with respect to the base material 1 of low alloy steel. A low alloy steel layer 3a and a dissimilar metal layer 3b welded on the low alloy steel layer 3a. The metal joint 2 is welded to the dissimilar metal layer 3b by a filler metal of the dissimilar metal. It is joined.

この接合構造によれば、母材１側の接合面１ａへの低合金鋼層３ａの肉盛溶接や、低合金鋼層３ａへの異材金属層３ｂの肉盛溶接について、予熱が必要であるが、異材金属層３ｂへの接合金物２の溶接接合については、予熱が不要となる。この結果、接合金物２自体を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することが可能になる。   According to this joining structure, preheating is necessary for overlay welding of the low alloy steel layer 3a to the joining surface 1a on the base material 1 side and overlay welding of the dissimilar metal layer 3b to the low alloy steel layer 3a. However, no preheating is required for the welded joint of the metal joint 2 to the dissimilar metal layer 3b. As a result, since the joining hardware 2 itself is not preheated, it is possible to improve the workability of welding the joining material of the dissimilar metal to the low alloy steel.

また、本実施の形態の接合構造は、異材金属層３ｂに対して異材金属の溶加材３ｃにより異材金属の位置決め部材４が溶接接合され、当該位置決め部材４に対して異材金属の溶加材３ｄにより接合金物２が溶接接合されていることが好ましい。   Further, in the joining structure of the present embodiment, the dissimilar metal positioning member 4 is welded to the dissimilar metal layer 3b by the dissimilar metal filler material 3c, and the dissimilar metal filler material is joined to the positioning member 4. The metal joint 2 is preferably welded and joined by 3d.

この接合構造によれば、異材金属層３ｂへの位置決め部材４の溶接接合や、位置決め部材４への接合金物２の溶接接合について、予熱が不要となる。この結果、位置決め部材４や接合金物２を予熱することがないため、低合金鋼に異材金属の接合金物を溶接接合する作業性を向上することが可能になる。しかも、位置決め部材４により接合金物２の接合位置の位置決めをすることが可能である。さらに、接合金物２を母材１から取り外す場合、異材金属層３ｂに対する位置決め部材４の溶接箇所である溶加材３ｃ部分を削除することで、接合金物２を母材１から容易に取り外すことが可能である。   According to this joining structure, preheating is not required for welding joining of the positioning member 4 to the dissimilar metal layer 3b and welding joining of the metal fitting 2 to the positioning member 4. As a result, since the positioning member 4 and the metal joint 2 are not preheated, it is possible to improve the workability of welding the metal alloy joint metal to the low alloy steel. In addition, it is possible to position the joint position of the joint hardware 2 by the positioning member 4. Furthermore, when removing the metal joint 2 from the base material 1, it is possible to easily remove the metal joint 2 from the base material 1 by deleting the portion of the filler material 3 c that is the welded portion of the positioning member 4 to the dissimilar metal layer 3 b. Is possible.

なお、上述した、接合方法および接合構造は、蒸気発生器１０１の胴部１０２を製造する場合において、母材１である下半部胴１０２Ａに、接合金物２である扇状補強板を溶接接合することに適用されているが、低合金鋼の母材１に対して材料の異なる異材金属の接合金物２を溶接接合するものであれば、母材１や接合金物２について限定されるものではなく、蒸気発生器１０１の胴部１０２の製造について限定されるものでもない。   Note that, in the above-described joining method and joining structure, when manufacturing the barrel 102 of the steam generator 101, the fan-shaped reinforcing plate, which is the joint hardware 2, is welded to the lower half barrel 102A, which is the base material 1, by welding. In particular, it is not limited to the base material 1 and the joint metal 2 as long as the joint metal 2 made of different materials of different materials is welded to the base material 1 of the low alloy steel. The production of the body 102 of the steam generator 101 is not limited.

１ 母材
１ａ 接合面
２ 接合金物
３ 接合部
３ａ 低合金鋼層
３ｂ 異材金属層
３ｃ，３ｄ 溶加材
４ 位置決め部材 DESCRIPTION OF SYMBOLS 1 Base material 1a Joining surface 2 Joined metal 3 Joining part 3a Low alloy steel layer 3b Dissimilar metal layer 3c, 3d Filler material 4 Positioning member

Claims (2)

低合金鋼の母材に対して材料の異なる異材金属の接合金物を溶接接合する接合方法において、
前記母材側の接合面に低合金鋼の肉盛溶接を行う工程と、
次に、前記低合金鋼の肉盛溶接面の上に異材金属の肉盛溶接を行う工程と、
次に、前記異材金属の肉盛溶接に対して異材金属の溶加材により前記接合金物を溶接接合する工程と、
を含み、
前記接合金物を溶接接合する工程では、前記異材金属の肉盛溶接に対して異材金属の溶加材により異材金属の位置決め部材を溶接接合し、当該位置決め部材に対して異材金属の溶加材により前記接合金物を溶接接合することを特徴とする接合方法。 In the joining method of welding joints of dissimilar metals of different materials to the base material of low alloy steel,
Performing overlay welding of low alloy steel on the joint surface on the base material side;
Next, a process of overlay welding of a dissimilar metal on the overlay welding surface of the low alloy steel,
Next, the step of welding and joining the joint metal with the filler metal of the dissimilar metal for the overlay welding of the dissimilar metal,
Including
In the step of welding and joining the metal fittings, the dissimilar metal positioning member is welded and joined to the dissimilar metal overlay welding with the dissimilar metal filler material, and the dissimilar metal filler material is welded to the positioning member. junction how to characterized by welding the joining hardware. 低合金鋼の母材と、
前記母材側の接合面に接合した低合金綱層と、
低合金鋼に対して材料の異なる異材金属からなり前記低合金鋼層の上に接合した異材金属層と、
前記異種金属層に対して異材金属の溶加材により接合した異材金属の位置決め部材と、
当該位置決め部材に対して異材金属の溶加材により接合して前記位置決め部材と前記異材金属層と前記低合金綱層とを介して前記母材に接合した異材金属の接合金物と、
を備えることを特徴とする接合構造。 Low alloy steel base material,
A low alloy rope layer bonded to the bonding surface on the base material side;
A dissimilar metal layer composed of dissimilar metals of different materials with respect to the low alloy steel and joined on the low alloy steel layer;
A dissimilar metal positioning member joined to the dissimilar metal layer with a dissimilar metal filler material ;
A metal joint made of a dissimilar metal joined to the base material via the positioning member, the dissimilar metal layer, and the low alloy steel layer by joining the positioning member with a filler metal of a dissimilar metal ,
Junction structure, characterized in that it comprises a.
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