JP2005088062A - Brazing method for stainless steel component - Google Patents

Brazing method for stainless steel component Download PDF

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JP2005088062A
JP2005088062A JP2003326694A JP2003326694A JP2005088062A JP 2005088062 A JP2005088062 A JP 2005088062A JP 2003326694 A JP2003326694 A JP 2003326694A JP 2003326694 A JP2003326694 A JP 2003326694A JP 2005088062 A JP2005088062 A JP 2005088062A
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brazing
powder
brazing material
stainless steel
fillet
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Masahiko Nagashima
政彦 長島
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Marelli Corp
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Calsonic Kansei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazing method for stainless steel components, a method capable of sufficiently securing joining strength of a weld zone even in the presence of an embrittled part in the fillet. <P>SOLUTION: In a brazing method with which stainless steel components 1, 2 are brazed with each other using powder brazing filler metal 4, brazing is performed with Ni-P based or Ni-Cr-P-Si based powder brazing filler metal 4 in which Ni powder 3 is mixed, and then brazing is repeated using again Ni-P based or Ni-Cr-P-Si based powder brazing filler metal 4. In the initial brazing, joining strength of the weld zone can be secured. In the second brazing, a joint gap made in the initial brazing can be filled with the Ni-P based or Ni-Cr-P-Si based filler metal having a superior fluidity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、例えばステンレス部品同士を粉末ろう材によりろう付けするステンレス部品のろう付け方法に関し、詳細には、ろう付け接合部の接合強度を高める技術に関する。   The present invention relates to a method of brazing stainless steel parts, for example, brazing stainless steel parts with a powder brazing material, and more particularly to a technique for increasing the joint strength of a brazed joint.

例えば、ステンレス鋼からなる構成部品より形成される熱交換器（以下、ステンレス熱交換器という）は、チューブやフィンなどの構成部品をろう材によってろう付けすることにより形成されている。ステンレス熱交換器のろう付けには、Ｃｕ系（銅系）ろう材に比べて低融点でろう材の広がり性が良好であるなどの利点を有することから、Ｎｉ−Ｐ系（ニッケル−リン系）ろう材やＮｉ−Ｃｒ−Ｐ−Ｓｉ系（ニッケル−クロム−リン−シリカ系）ろう材が広く使用されている。   For example, a heat exchanger (hereinafter referred to as a “stainless steel heat exchanger”) formed of stainless steel components is formed by brazing components such as tubes and fins with a brazing material. The brazing of a stainless steel heat exchanger has advantages such as a low melting point and good spreadability of the brazing material compared to the Cu (copper) brazing material. ) Brazing material and Ni-Cr-P-Si (nickel-chromium-phosphorus-silica) brazing material are widely used.

ところで、Ｎｉ（ニッケル）中のＰ（リン）はろう材の融点を下げ、ろうの流れ性を向上させるため、Ｐを約６〜１１％含むろう材を使用してろう付けするのが一般的である（例えば、特許文献１など参照）。
特開２００１−１５０１２６号公報（第２頁および第３頁、第１図） By the way, P (phosphorus) in Ni (nickel) lowers the melting point of the brazing material and improves the flowability of the brazing material. Therefore, brazing using a brazing material containing about 6 to 11% of P is generally used. (See, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2001-150126 (2nd and 3rd pages, FIG. 1)

ところが、Ｐを６〜１１％含むろう材は、ろう付け後のフィレットにＰ濃度の高い脆化部を作りやすく、接合強度が低いという問題がある。図８（ａ）は、ろう材としてＪＩＳ規格に規定されているＢＮｉ６（Ｎｉ−１１％Ｐ）でチューブ１０１とフィン１０２をろう付けした部分を拡大して示す図である。この図からわかるように、ろう付け部であるフィレット１０３に、Ｐ濃度が高い脆化部１０４が形成されていることが判る。   However, a brazing material containing 6 to 11% of P has a problem that an embrittled portion having a high P concentration is easily formed in a fillet after brazing, and bonding strength is low. FIG. 8A is an enlarged view showing a portion where the tube 101 and the fin 102 are brazed with BNi6 (Ni-11% P) defined in the JIS standard as a brazing material. As can be seen from this figure, it can be seen that an embrittled portion 104 having a high P concentration is formed in the fillet 103 which is a brazed portion.

ろう材中のＰ濃度を下げれば、図８（ｂ）に示すように、ろう付け後のフィレット１０３中の脆化部１０４の量（面積）は減少させることはできる。しかしながら、脆化部１０４は、最終凝固層であるため、フィレット１０３中に僅かに残る。このフィレット１０３中に残った脆化部１０４は、フィレット１０３を横断する形で存在するため、チューブ１０１とフィン１０２との接合部の接合強度を低下させる。   If the P concentration in the brazing material is lowered, the amount (area) of the embrittled portion 104 in the fillet 103 after brazing can be reduced as shown in FIG. However, since the embrittled portion 104 is the final solidified layer, it slightly remains in the fillet 103. Since the embrittled portion 104 remaining in the fillet 103 exists so as to cross the fillet 103, the joint strength of the joint portion between the tube 101 and the fin 102 is reduced.

つまり、前記したろう材を使用した場合、脆化部１０４がフィレット１０３を横断して形成されていることから、脆化部１０４にひびが入ると、フィレット１０３全体に亘ってひびが進行する。このため、チューブ１０１とフィン１０２の接合部では、充分な接合強度を確保することができない。   That is, when the brazing material described above is used, since the embrittled portion 104 is formed across the fillet 103, when the embrittled portion 104 is cracked, the crack progresses over the entire fillet 103. For this reason, sufficient joint strength cannot be ensured at the joint between the tube 101 and the fin 102.

そこで、本発明は、前記した課題を解決すべくなされたものであり、フィレットに脆化部が存在しても接合部の接合強度を充分に確保することのできるステンレス部品のろう付け方法を提供することを目的とする。   Accordingly, the present invention has been made to solve the above-described problem, and provides a brazing method for a stainless steel part that can sufficiently secure the bonding strength of the bonded portion even when the brittle portion is present in the fillet. The purpose is to do.

請求項１に記載の発明は、ステンレス部品同士を粉末ろう材によりろう付けするステンレス部品のろう付け方法において、Ｎｉ粉末を混合したＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材でろう付けした後、さらにＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材でろう付けすることを特徴とする。   The invention according to claim 1 is a brazing method for stainless steel parts in which stainless steel parts are brazed to each other with a powder brazing material, and a Ni-P based or Ni-Cr-P-Si based powder brazing material mixed with Ni powder. After brazing, it is further characterized by brazing with a Ni-P-based or Ni-Cr-P-Si-based powder brazing material.

請求項２に記載の発明は、請求項１に記載のステンレス部品のろう付け方法であって、前記Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材に、前記Ｎｉ粉末を５〜６０重量％混合させたことを特徴とする。   A second aspect of the present invention is the method of brazing a stainless steel part according to the first aspect, wherein the Ni powder is added to the Ni-P-based or Ni-Cr-P-Si-based powder brazing material. It is characterized by mixing ˜60% by weight.

請求項３に記載の発明は、請求項１または請求項２に記載のステンレス部品のろう付け方法であって、前記ステンレス部品の接合面に対するろう材の塗布量を、前記接合面における全体積の３０〜８０％としたことを特徴とする。   The invention according to claim 3 is the method of brazing a stainless steel part according to claim 1 or 2, wherein the amount of the brazing material applied to the joining surface of the stainless steel part is determined by the total volume of the joining surface. It is characterized by being 30 to 80%.

請求項１記載の発明によれば、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材にＮｉ粉末を混合した粉末ろう材を使用してステンレス部品同士をろう付けすると、脆化部が形成されたＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材からなるフィレットの両脇に、Ｎｉ濃度が高く接合強度の高いフィレットが形成されるので、仮に脆化部よりひびが入ったとしてもその両側の接合強度の高いフィレットによってひび割れの進行が防止され、当該接合部の機械的強度を充分に確保することができる。   According to the first aspect of the present invention, when stainless steel parts are brazed to each other by using a powder brazing material in which Ni powder is mixed with Ni-P or Ni-Cr-P-Si based powder brazing material, embrittlement occurs. Since fillets with high Ni concentration and high bonding strength are formed on both sides of a fillet made of Ni-P-based or Ni-Cr-P-Si-based powder brazing material with the portion formed, Even if there is a crack, the progress of cracks is prevented by the fillets having high joint strength on both sides, and the mechanical strength of the joint can be sufficiently secured.

また、本発明によれば、Ｎｉ粉末を混合するとろう材の流動性が低下してフィレットはポーラス（孔）になり易くなるが、さらにＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材でろう付けすることによって、一度目のろう付けで出来た隙間（孔）をこの粉末ろう材で埋めることができる。これにより、ステンレス部品同士を強固にろう付けすることができる。   In addition, according to the present invention, when Ni powder is mixed, the fluidity of the brazing material is lowered and the fillet is likely to become porous (holes), but the Ni-P-based or Ni-Cr-P-Si-based powder is also provided. By brazing with the brazing material, the gap (hole) formed by the first brazing can be filled with the powder brazing material. Thereby, stainless steel parts can be firmly brazed.

請求項２記載の発明によれば、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材に、Ｎｉ粉末を５〜６０重量％混合させているので、Ｎｉ粉末を混合しない粉末ろう材に比べて大幅に接合強度を高めることができる。   According to the invention described in claim 2, since Ni powder is mixed with Ni-P or Ni-Cr-P-Si powder brazing material in an amount of 5 to 60% by weight, powder brazing without mixing Ni powder. Compared to the material, the bonding strength can be greatly increased.

請求項３記載の発明によれば、ステンレス部品の接合面に対するろう材の塗布量を、該接合面における全体積の３０〜８０％としたことにより、一度目のろう付けで出来た隙間を、２度目のろう材によって充分に充填させることができる。   According to the invention of claim 3, by setting the amount of brazing material applied to the joining surface of the stainless steel part to 30 to 80% of the total volume of the joining surface, the gap formed by the first brazing, It can be sufficiently filled with the second brazing filler metal.

以下、本発明を適用した具体的な実施の形態について図面を参照しながら詳細に説明する。   Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

［ステンレス部品のろう付け方法］
図１は、Ｎｉ粉末を混合したＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材で、ステンレス部品同士をろう付けしたときの工程図である。先ず、図１（ａ）に示すように、ステンレス鋼からなるステンレス部品１、２の接合面１ａ、２ａに、Ｎｉ粉末３を混合した粉末ろう材４を塗布する。 [Method of brazing stainless steel parts]
FIG. 1 is a process diagram when stainless steel parts are brazed to each other with a Ni—P or Ni—Cr—P—Si based powder brazing material mixed with Ni powder. First, as shown in FIG. 1A, a powder brazing material 4 in which Ni powder 3 is mixed is applied to the joining surfaces 1a and 2a of stainless steel parts 1 and 2 made of stainless steel.

粉末ろう材４としては、例えばＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系のろう材を用いる。この実施の形態では、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材４に対して、Ｎｉ粉末３を重量比で５〜６０重量％混合する。   As the powder brazing material 4, for example, a Ni-P or Ni-Cr-P-Si brazing material is used. In this embodiment, the Ni powder 3 is mixed with the Ni-P-based or Ni-Cr-P-Si-based powder brazing material 4 in a weight ratio of 5 to 60% by weight.

次に、このステンレス部品１、２を炉内に入れて加熱する。Ｎｉ粉末３の融点は、およそ１４００℃であり、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材４の融点よりも高い。このため、炉内の温度が粉末ろう材４の融点に達すると、図１（ｂ）に示すように、粉末ろう材４のみ溶融する。   Next, the stainless parts 1 and 2 are placed in a furnace and heated. The melting point of the Ni powder 3 is approximately 1400 ° C., which is higher than the melting point of the Ni—P-based or Ni—Cr—P—Si-based powder brazing material 4. For this reason, when the temperature in the furnace reaches the melting point of the powder brazing material 4, only the powder brazing material 4 is melted, as shown in FIG.

さらに、加熱を続けると、図１（ｃ）に示すように、Ｎｉ粉末３も溶融した粉末ろう材４に溶け込む。そして、ろう付け後に、これらステンレス部品１、２を冷却すると、図１（ｄ）に示すようなフィレット５が形成される。フィレット５は、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の第１フィレット５ａと、この第１フィレット５ａを挟んでその両側に形成される第２フィレット５ｂとからなる。   Further, when the heating is continued, the Ni powder 3 also melts into the melted powder brazing material 4 as shown in FIG. And after brazing, when these stainless steel parts 1 and 2 are cooled, the fillet 5 as shown in FIG.1 (d) is formed. The fillet 5 includes a first fillet 5a made of Ni-P or Ni-Cr-P-Si, and second fillets 5b formed on both sides of the first fillet 5a.

第１フィレット５ａは、その中央部に接合面方向に延びるＰ濃度の高い脆化部６と、その上下に接合強度が高いＮｉ濃度の高い部分を有したフィレットからなる。第２フィレット５ｂは、Ｎｉ濃度が高く接合強度の高いフィレットである。   The first fillet 5a is composed of a brittle portion 6 having a high P concentration extending in the direction of the joint surface at the center thereof, and a fillet having portions having a high Ni concentration and a high joint strength above and below the first fillet. The second fillet 5b is a fillet having a high Ni concentration and high bonding strength.

このように、本実施の形態では、第１フィレット５ａの脆化部６を挟むようにその両側にＮｉ濃度の高い第２フィレット５ｂが形成されるので、ステンレス部品１、２同士の接合強度を高めることができる。すなわち、Ｎｉ粉末３は、凝固時には接合強度が高い初晶となり、接合強度の弱い脆化部６をその両側から保護することで、仮に脆化部６にひびが入ったとしても接合強度の高い第２フィレット５ｂでこのひびの進行を防止することができる。   Thus, in this Embodiment, since the 2nd fillet 5b with high Ni density | concentration is formed in the both sides so that the embrittlement part 6 of the 1st fillet 5a may be pinched | interposed, the joining strength of stainless steel components 1 and 2 is made. Can be increased. That is, the Ni powder 3 becomes a primary crystal having a high bonding strength when solidified, and the brittle portion 6 having a low bonding strength is protected from both sides, so that the bonding strength is high even if the brittle portion 6 is cracked. The progress of this crack can be prevented by the second fillet 5b.

しかしながら、接合強度は確保できるものの粉末ろう材４にＮｉ粉末３を混合すると、ろう材の流動性が低下し、フィレット５はポーラスになり易くなる（孔が形成され易くなる）。このＮｉ粉末３を粉末ろう材４に混合させたろう材で熱交換器のろう付けを行うと、気密性の確保が難しい。   However, when Ni powder 3 is mixed with the powder brazing material 4 although the bonding strength can be ensured, the fluidity of the brazing material is lowered and the fillet 5 is likely to be porous (holes are easily formed). When the heat exchanger is brazed with a brazing material obtained by mixing the Ni powder 3 with the powder brazing material 4, it is difficult to ensure airtightness.

そこで、ステンレス熱交換器をろう付けする場合は、Ｎｉ粉末３を混合させないＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材４で再度ろう付けを行う。すなわち、Ｎｉ粉末３を混合した粉末ろう材４でステンレス部品１、２をろう付けした後、さらにＮｉ粉末３を混合しない粉末ろう材４（Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材）でこれらステンレス部品１、２をろう付けする。   Therefore, when brazing a stainless steel heat exchanger, brazing is again performed using a Ni-P-based or Ni-Cr-P-Si-based powder brazing material 4 in which the Ni powder 3 is not mixed. That is, after brazing stainless steel parts 1 and 2 with a powder brazing material 4 mixed with Ni powder 3, a powder brazing material 4 (Ni-P or Ni-Cr-P-Si based) without further mixing Ni powder 3 is used. These stainless steel parts 1 and 2 are brazed with a powder brazing material.

Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材４は、流れ性が良いので、一度目のろう付けで出来た隙間に入り込み、この隙間を充填させ気密性を確保する。このとき、隙間が少なすぎると（又は隙間が少なく密であると）、内部にまでろう材が充分に流れないため、Ｎｉ粉末３を混合させた粉末ろう材４の塗布量は、ろう付けを行う部分の全体積（ステンレス部品１、２の接合面１ａ、２ａ）に対し、３０〜８０％とする。こうすることで、フィレット５に形成された隙間を充填させて気密性を高めることができると共に、ステンレス部品１、２の接合強度を大幅に向上させることができる。   The Ni—P or Ni—Cr—P—Si based powder brazing material 4 has good flowability, so it enters the gap formed by the first brazing and fills this gap to ensure airtightness. At this time, if the gap is too small (or if the gap is small and dense), the brazing material does not flow sufficiently to the inside. Therefore, the amount of the powder brazing material 4 mixed with the Ni powder 3 is brazed. The total volume of the parts to be performed (joint surfaces 1a and 2a of the stainless parts 1 and 2) is 30 to 80%. By doing so, the gap formed in the fillet 5 can be filled to improve airtightness, and the joining strength of the stainless steel parts 1 and 2 can be greatly improved.

［実験例］
次に、Ｎｉ粉末３の添加量（混合量）と引っ張り強度の関係を調べるべく以下のような実験を行った。 [Experimental example]
Next, the following experiment was conducted in order to investigate the relationship between the added amount (mixed amount) of Ni powder 3 and the tensile strength.

先ず、図２に示すように、長さ４０ｍｍ、幅２０ｍｍのステンレス鋼からなる平板の先端を、その折り曲げ高さが１０ｍｍとなるように直角に折り曲げてテストピース７を作成する。テストピース７は、２枚作成するものとする。次に、その先端を直角に折り曲げた接合部８の接合面８ａにろう材を塗布する。ろう材は、ＢＮｉ６ろう材に、Ｎｉ粉末を５〜６０％添加したろう材９を使用する。   First, as shown in FIG. 2, a test piece 7 is formed by bending the tip of a flat plate made of stainless steel having a length of 40 mm and a width of 20 mm at a right angle so that the bending height is 10 mm. Two test pieces 7 are prepared. Next, a brazing material is applied to the joint surface 8a of the joint 8 whose tip is bent at a right angle. As the brazing material, a brazing material 9 in which 5 to 60% of Ni powder is added to the BNi6 brazing material is used.

そして、図３に示すように、これらテストピース７の接合面８ａ同士を突き合わせた後、テストピース７を炉内に入れて加熱する。次に、ろう付け後のテストピース７を同図中矢印で示す方向に引っ張り、このテストピース７の接合部における引っ張り強度を測定した。   Then, as shown in FIG. 3, after the joining surfaces 8a of these test pieces 7 are brought into contact with each other, the test piece 7 is placed in a furnace and heated. Next, the test piece 7 after brazing was pulled in the direction indicated by the arrow in the figure, and the tensile strength at the joint of the test piece 7 was measured.

図４は、そのテストピース７のＮｉ粉末の添加量に対する引っ張り強度を示すグラフである。グラフ中の引っ張り強度は、試験結果をテストピース７の接合幅で割ったものである。   FIG. 4 is a graph showing the tensile strength with respect to the amount of Ni powder added to the test piece 7. The tensile strength in the graph is obtained by dividing the test result by the joining width of the test piece 7.

この図４から判るように、Ｎｉ粉末の添加量が無い（Ｎｉ添加量０％）には、引っ張り強度が１０Ｎ／ｍｍ以下で接合強度を確保することができない。しかしながら、Ｎｉ粉末の添加量を５〜６０重量％とした場合は、引っ張り強度が大幅に向上しているのが判る。なお、このテストピース７の接合部における断面を調べた結果、ボイドの多いフィレットであることが判った。   As can be seen from FIG. 4, without the addition amount of Ni powder (Ni addition amount 0%), the tensile strength is 10 N / mm or less, and the joining strength cannot be ensured. However, it can be seen that when the amount of Ni powder added is 5 to 60% by weight, the tensile strength is greatly improved. In addition, as a result of examining the cross section in the junction part of this test piece 7, it turned out that it is a fillet with many voids.

次に、ろう材塗布量と接合強度の関係を調べるべく以下の実験を行った。   Next, the following experiment was conducted in order to investigate the relationship between the brazing material coating amount and the bonding strength.

試料には、前記したテストピース７を使用し、その接合部８の接合面８ａに対するろう材９の塗布量を変化させたときの当該接合部の引っ張り強度を測定した。引っ張り強度の測定方法は、先の実験例と同じである。   The test piece 7 described above was used as a sample, and the tensile strength of the joint was measured when the amount of the brazing material 9 applied to the joint surface 8a of the joint 8 was changed. The method for measuring the tensile strength is the same as in the previous experimental example.

図５は、そのテストピース７のろう付け体積に対するろう材供給量と引っ張り強度の関係を示すグラフである。グラフ中、斜線で示す部分は、Ｎｉ粉末を混合していないＢＮｉ６ろう材の接合強度である。   FIG. 5 is a graph showing the relationship between the brazing material supply amount and the tensile strength with respect to the brazing volume of the test piece 7. In the graph, the hatched portion is the bonding strength of the BNi6 brazing material not mixed with Ni powder.

この図５から判るように、接合面８ａに対するろう材９の塗布量を、この接合面８ａにおける全体積の３０％以上とすると、Ｎｉ粉末を含まないろう材よりも引っ張り強度が高くなっていることが判る。しかしながら、表１に示すように、Ｎｉ粉末を添加したろう材９の量が接合面８ａにおける全体積の８０％までのテストピース７では、その後のろう付け（Ｎｉ粉末を含まないＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材でろう付け）で気密を確保することができるが、１００％以上ではポーラスな部分が少なすぎてろう材９が充分に流れ込まないために、気密性を確保することができない。

Figure 2005088062
As can be seen from FIG. 5, when the amount of the brazing material 9 applied to the joint surface 8a is 30% or more of the total volume of the joint surface 8a, the tensile strength is higher than that of the brazing material not containing Ni powder. I understand that. However, as shown in Table 1, in the test piece 7 in which the amount of the brazing material 9 added with Ni powder is up to 80% of the total volume on the joint surface 8a, the subsequent brazing (Ni-P system containing no Ni powder) Or brazing with a Ni—Cr—P—Si-based powder brazing material), but at 100% or more, there are too few porous parts and the brazing material 9 does not flow sufficiently. Sex cannot be secured.
Figure 2005088062

以上のように、ステンレス部品をろう付けするに際しては、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材にＮｉ粉末を混合させたろう材でろう付けした後、Ｎｉ粉末を含まないＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材で再ろう付けすれば、ポーラスが無く、気密で接合強度の高いろう付けを行うことができる。また、Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材にＮｉ粉末を５〜６０重量％混合させることによって、接合強度を充分に確保することができる。また、ろう付けを行う接合面に対するろう材の塗布量を、該接合面における全体積の３０〜８０％とすることで、気密性を高めることができる。   As described above, when brazing stainless steel parts, Ni powder is not included after brazing with a brazing material in which Ni powder is mixed with Ni-P or Ni-Cr-P-Si powder brazing material. By re-brazing with a Ni-P or Ni-Cr-P-Si-based powder brazing material, there is no porosity, and brazing with high airtightness and bonding strength can be performed. Further, by mixing 5 to 60% by weight of Ni powder with Ni—P or Ni—Cr—P—Si based powder brazing material, sufficient bonding strength can be ensured. Moreover, airtightness can be improved by making the application quantity of the brazing material with respect to the joint surface which brazes into 30 to 80% of the total volume in this joint surface.

［熱交換器のろう付け方法］
次に、気密性が求められる熱交換器をろう付けする方法について説明する。 [Brazing method of heat exchanger]
Next, a method for brazing a heat exchanger that requires airtightness will be described.

図６および図７は、本発明の方法により製造する熱交換器の一例である。この熱交換器１０は、プレート１１と、冷却フィン１２と、チューブ１３と、タンク１４と、パイプ１５とを備えており、所定間隔に配置した各プレート１１の間に冷却フィン１２とチューブ１３を設けて積層したコアの両端にタンク１４を取り付けた構造である。 6 and 7 show an example of a heat exchanger manufactured by the method of the present invention. The heat exchanger 10 includes a plate 11, a cooling fin 12, a tube 13, a tank 14, and a pipe 15. The cooling fin 12 and the tube 13 are placed between the plates 11 arranged at a predetermined interval. In this structure, tanks 14 are attached to both ends of the cores provided and stacked.

この構成の熱交換器１０を製造するには、プレート１１の上に冷却フィン１２およびチューブ１３を配列させた後、これら冷却フィン１２およびチューブ１３の上にプレート１１をさらに載せる。次に、このプレート１１の上に、下層の冷却フィン１２およびチューブ１３の配列向きに対して直交する向きに冷却フィン１２およびチューブ１３を配列する。これを繰り返してプレート１１、冷却フィン１２およびチューブ１３からなるコアを形成し、そのコアの両端にパイプ１５を取り付けたタンク１４を仮組する。   In order to manufacture the heat exchanger 10 having this configuration, the cooling fins 12 and the tubes 13 are arranged on the plates 11, and then the plates 11 are further placed on the cooling fins 12 and the tubes 13. Next, the cooling fins 12 and the tubes 13 are arranged on the plate 11 in a direction orthogonal to the arrangement direction of the lower-layer cooling fins 12 and the tubes 13. By repeating this, a core composed of the plate 11, the cooling fins 12, and the tubes 13 is formed, and a tank 14 having pipes 15 attached to both ends of the core is temporarily assembled.

そして、少なくともこれらプレート１１、冷却フィン１２、チューブ１３、タンク１４およびパイプ１５の接合部分にＮｉ粉末を混合させたＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材を塗布した後、この仮組した熱交換器１０を炉内に投入し加熱する。この結果、粉末ろう材が溶融し冷却フィン１２、チューブ１３、タンク１４およびパイプ１５の各構成部品の接合部分がろう付けされる。   After applying a Ni-P-based or Ni-Cr-P-Si-based powder brazing material in which Ni powder is mixed to at least the joining portion of the plate 11, the cooling fin 12, the tube 13, the tank 14 and the pipe 15. The temporarily assembled heat exchanger 10 is put into a furnace and heated. As a result, the powder brazing material is melted and the joint portions of the cooling fin 12, tube 13, tank 14 and pipe 15 components are brazed.

次に、このろう付けされた熱交換器１０に、Ｎｉ粉末を混合させないＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材を塗布する。そして、この熱交換器１０を再度、炉内に投入して加熱する。すると、最初のろう付けでフィレットに形成された隙間に、Ｎｉ粉末が混合されていないＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材が充填される。これにより、ポーラスが無く、気密で接合強度の高いろう付けがなされる。   Next, a Ni-P-based or Ni-Cr-P-Si-based powder brazing material not mixed with Ni powder is applied to the brazed heat exchanger 10. The heat exchanger 10 is again put into the furnace and heated. Then, the Ni-P-based or Ni-Cr-P-Si-based powder brazing material not mixed with Ni powder is filled in the gap formed in the fillet by the first brazing. As a result, there is no porosity, and airtight and high bonding strength brazing is performed.

［その他の実施の形態］
以上、本発明を適用した具体的な実施の形態について説明したが、本発明は、上述の実施の形態に制限されることなく種々の変更が可能である。 [Other embodiments]
Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

例えば、上述の実施の形態では、ステンレス部品のろう付けの一例として熱交換器を例に挙げて説明したが、気密性を必要とするステンレス部品から構成されるものであれば如何なるものにも本発明の方法を適用することができる。   For example, in the above-described embodiment, a heat exchanger has been described as an example of brazing of a stainless part, but the present invention can be applied to any one that includes a stainless part that requires airtightness. The method of the invention can be applied.

Ｎｉ粉末を混合したＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材で、ステンレス部品同士をろう付けしたときの工程図である。FIG. 5 is a process diagram when stainless steel parts are brazed with a Ni—P or Ni—Cr—P—Si powder brazing material mixed with Ni powder. Ｎｉ粉末の添加量と引っ張り強度の関係を調べる際に使用したテストピースの製造工程を示す図である。It is a figure which shows the manufacturing process of the test piece used when investigating the relationship between the addition amount of Ni powder, and tensile strength. ろう付けしたテストピースの引っ張り強度を測定する一例を示す図である。It is a figure which shows an example which measures the tensile strength of the test piece which brazed. テストピースのＮｉ粉末の添加量に対する引っ張り強度を示すグラフである。It is a graph which shows the tensile strength with respect to the addition amount of Ni powder of a test piece. テストピースのろう付け体積に対するろう材供給量と引っ張り強度の関係を示すグラフである。It is a graph which shows the relationship between the brazing material supply amount with respect to the brazing volume of a test piece, and tensile strength. 本発明の方法により製造する熱交換器の一例を示す斜視図である。It is a perspective view which shows an example of the heat exchanger manufactured with the method of this invention. 本発明の方法により製造する熱交換器の一例を示す断面図である。It is sectional drawing which shows an example of the heat exchanger manufactured by the method of this invention. ＢＮｉ６ろう材でろう付けした熱交換器のチューブと冷却フィンとの接合部の要部拡大図である。It is a principal part enlarged view of the junction part of the tube and cooling fin of the heat exchanger brazed with the BNi6 brazing material.

符号の説明Explanation of symbols

１、２…ステンレス部品
１ａ、２ａ…接合面
３…Ｎｉ粉末
４…粉末ろう材
５…フィレット
６…脆化部
７…テストピース DESCRIPTION OF SYMBOLS 1, 2 ... Stainless steel part 1a, 2a ... Joining surface 3 ... Ni powder 4 ... Powder brazing material 5 ... Fillet 6 ... Brittle part 7 ... Test piece

Claims (3)

ステンレス部品（１、２）同士を粉末ろう材（４）によりろう付けするステンレス部品のろう付け方法において、
Ｎｉ粉末（３）を混合したＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材（４）でろう付けした後、さらにＮｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材（４）でろう付けする
ことを特徴とするステンレス部品のろう付け方法。 In the brazing method for stainless steel parts in which the stainless steel parts (1, 2) are brazed together with the powder brazing material (4),
After brazing with a Ni-P-based or Ni-Cr-P-Si-based powder brazing material (4) mixed with Ni powder (3), Ni-P-based or Ni-Cr-P-Si-based powder A brazing method for stainless steel parts characterized by brazing with a brazing material (4). 請求項１に記載のステンレス部品のろう付け方法であって、
前記Ｎｉ−Ｐ系またはＮｉ−Ｃｒ−Ｐ−Ｓｉ系の粉末ろう材（４）に、前記Ｎｉ粉末（３）を５〜６０重量％混合させた
ことを特徴とするステンレス部品のろう付け方法。 A method for brazing stainless steel parts according to claim 1,
A brazing method for stainless steel parts, characterized in that the Ni powder (3) is mixed in an amount of 5 to 60 wt% with the Ni-P or Ni-Cr-P-Si powder brazing material (4). 請求項１または請求項２に記載のステンレス部品のろう付け方法であって、
前記ステンレス部品（１、２）の接合面（１ａ、２ａ）に対するろう材の塗布量を、前記接合面（１ａ、２ａ）における全体積の３０〜８０％とした
ことを特徴とするステンレス部品のろう付け方法。
A method of brazing a stainless steel part according to claim 1 or 2,
The amount of brazing material applied to the joining surfaces (1a, 2a) of the stainless steel parts (1, 2) is 30 to 80% of the total volume of the joining surfaces (1a, 2a). Brazing method.
JP2003326694A 2003-09-18 2003-09-18 Brazing method for stainless steel component Pending JP2005088062A (en)

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CN103512800A (en) * 2012-06-25 2014-01-15 波音公司 System and method for testing a fillet bond
CN103537821A (en) * 2013-11-05 2014-01-29 中国航空工业集团公司北京航空材料研究院 Fe-Ni based brazing filler metal for high-temperature brazing
EP2853332A1 (en) * 2013-09-26 2015-04-01 Alfa Laval Corporate AB A novel brazing concept
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Publication number Priority date Publication date Assignee Title
CN103512800A (en) * 2012-06-25 2014-01-15 波音公司 System and method for testing a fillet bond
JP2014006252A (en) * 2012-06-25 2014-01-16 Boeing Co System and method for testing fillet bond
KR101880019B1 (en) * 2013-09-26 2018-07-18 알파 라발 코포레이트 에이비 A novel brazing concept
US10180292B2 (en) 2013-09-26 2019-01-15 Alfa Laval Corporate Ab Plate heat exchanger
WO2015043977A1 (en) * 2013-09-26 2015-04-02 Alfa Laval Corporate Ab A novel brazing concept
CN105555452A (en) * 2013-09-26 2016-05-04 阿尔法拉瓦尔股份有限公司 Method for joining metal parts
CN105658365A (en) * 2013-09-26 2016-06-08 阿尔法拉瓦尔股份有限公司 A novel brazing concept
US20160175990A1 (en) * 2013-09-26 2016-06-23 Alfa Laval Corporate Ab A novel brazing concept
CN113145958B (en) * 2013-09-26 2023-08-22 阿尔法拉瓦尔股份有限公司 Novel brazing concept
EP2853332A1 (en) * 2013-09-26 2015-04-01 Alfa Laval Corporate AB A novel brazing concept
US10323890B2 (en) 2013-09-26 2019-06-18 Alfa Laval Corporate Ab Method for joining metal parts
CN113145958A (en) * 2013-09-26 2021-07-23 阿尔法拉瓦尔股份有限公司 Novel brazing concept
US10576587B2 (en) 2013-09-26 2020-03-03 Alfa Laval Corporate Ab Brazing concept
CN103537821A (en) * 2013-11-05 2014-01-29 中国航空工业集团公司北京航空材料研究院 Fe-Ni based brazing filler metal for high-temperature brazing
JP2019195835A (en) * 2018-05-10 2019-11-14 日本特殊陶業株式会社 Joint body
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