JP2023179336A - Pit apparatus - Google Patents
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- JP2023179336A JP2023179336A JP2022104070A JP2022104070A JP2023179336A JP 2023179336 A JP2023179336 A JP 2023179336A JP 2022104070 A JP2022104070 A JP 2022104070A JP 2022104070 A JP2022104070 A JP 2022104070A JP 2023179336 A JP2023179336 A JP 2023179336A
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- 238000003466 welding Methods 0.000 claims abstract description 71
- 239000010935 stainless steel Substances 0.000 claims abstract description 46
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 46
- 229910001335 Galvanized steel Inorganic materials 0.000 claims abstract description 32
- 239000008397 galvanized steel Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 12
- 239000010962 carbon steel Substances 0.000 abstract description 12
- 239000010410 layer Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 238000000034 method Methods 0.000 description 13
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- 229910001566 austenite Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004021 metal welding Methods 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 238000005219 brazing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
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- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
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Abstract
Description
本発明は、ピット装置に関する。 TECHNICAL FIELD The present invention relates to a pit device.
室内等の床面に設けられる配線ケーブル用或いは給排水用のピットや、屋外の処理施設等に埋設される各種槽には、それらの開放上面（即ち設置面の開口部）を塞いで設置面と上面が略面一となる所謂「配管ピットの開口部の蓋装置」が付設される。 For pits for wiring cables or water supply and drainage installed on the floor of indoor rooms, etc., and various tanks buried in outdoor treatment facilities, etc., close their open tops (i.e., the openings on the installation surface) so that they do not overlap with the installation surface. A so-called "piping pit opening lid device" whose upper surface is substantially flush is attached.
この通称ピット蓋装置は、従来、必要な耐荷を確保するために蓋本体を鋼板より形成していた。蓋本体は、断面Ｌ型のステンレス製側枠アングルの間にＳＳ製底板を溶接して上部開放型のボックスを作成し、このボックス内における底板上にモルタルを敷きその上にタイルを貼設して歩行者等の重量を受けても耐えられる剛性にしてある。
従って前記従来のピット蓋装置は、側枠アングルや底板が厚いＳＳ製の重量体になり、しかもこれら部材間の全係合部に溶接棒を用いてアーク溶接しなければならない。
このように従来のピット蓋装置は、製作には多くの工程を要し且つ重筋作業を伴うもので必然的にコストが大幅に嵩むものであった。
これ等の現状から、本発明者等は、製作が極めて簡易であり、しかも軽量化を可能にしながら十分な強度を有し且つ大幅なコストダウンを可能にする蓋装置として、ステンレス鋼板と炭素鋼板との組み合わせで該軽量化と、十分な強度を有し安価に製作が簡易にできる研究を開始した。Conventionally, the lid body of this so-called pit lid device has been formed from a steel plate in order to ensure the necessary load capacity. The main body of the lid is made by welding an SS bottom plate between the stainless steel side frame angles with an L-shaped cross section to create an open-top box. Mortar is spread on the bottom plate inside this box, and tiles are pasted on top of it. It is designed to be rigid enough to withstand the weight of pedestrians and other objects.
Therefore, the conventional pit lid device is a heavy body made of SS with thick side frame angles and a bottom plate, and all the engagement parts between these members must be arc welded using a welding rod.
As described above, the production of conventional pit lid devices requires many steps and involves heavy manual labor, which inevitably results in a significant increase in cost.
Given these current circumstances, the inventors of the present invention have developed stainless steel plates and carbon steel plates as lid devices that are extremely simple to manufacture, have sufficient strength while being lightweight, and can significantly reduce costs. We have started research on how to reduce the weight, have sufficient strength, and make it inexpensive and easy to manufacture in combination with the following.
そこで、一般に金属の溶接方法は「融接」「固相溶接」および「ろう接」の３つに分類される。融接（ゆうせつ）は溶接界面が液相と液相の接触による溶接（Ｗｅｌｄｉｎｇ）被溶接金属の溶接部を加熱し、溶融させて溶接する方法であり、代表的なものとして電気・ガス・レーザ溶接がある。固相溶接（こそうせつごう）は溶接界面が固相と固相の接触による溶接（ＳｏｌｉｄＳｔａｔｅＢｏｎｄｉｎｇ）で被溶接金属に機械的圧力を加え、溶接界面に局部的な塑性変形を生じさせ、溶接する方法であり、拡散溶接や超音波金属溶接が挙げられる。ろう接（ろうせつ）は溶接界面が液相と固相の接触による溶接（Ｂｒａｚｉｎｇ：ブレージング）で被溶接金属よりも融点の低いロウ材を溶接界面に流し、溶接する方法であり、各種ロウ付けがこれに当たる。 Therefore, metal welding methods are generally classified into three types: "fusion welding," "solid phase welding," and "brazing." Fusion welding is a method of welding by heating and melting the welding part of the metal to be welded, where the welding interface is caused by contact between liquid phases. Typical examples include electricity, gas, There is laser welding. Solid state bonding is a welding process in which the welding interface is in contact with a solid phase.Mechanical pressure is applied to the metal to be welded, causing local plastic deformation at the welding interface, and welding is performed. These methods include diffusion welding and ultrasonic metal welding. Brazing is a method of welding in which the welding interface is caused by contact between a liquid phase and a solid phase, and a brazing material with a melting point lower than that of the metal to be welded is poured onto the welding interface. corresponds to this.
そしてこのような金属溶接の選択は、材質、形状の他に表面状態や表面処理によって最適な溶接工法を選択することが必要である。
而してステンレス鋼板と炭素鋼板の溶接は即ち、異種金属溶接方法は材質によって融点・硬度・電気抵抗値等の違いがあり、材質によってはその特性を把握できていないと、非常に困難である。必要なのは、材質の特性の把握を行い、適切な溶接方法の選択が必要である。
更に、溶接の信頼性、コスト等による工法の選択についても重要な要素となる。When selecting such metal welding, it is necessary to select the optimal welding method based on the material, shape, surface condition, and surface treatment.
Therefore, welding stainless steel plates and carbon steel plates, that is, dissimilar metal welding methods, differs depending on the material in terms of melting point, hardness, electrical resistance, etc., and it is extremely difficult to weld the material depending on the material, unless the characteristics of the material are understood. . What is necessary is to understand the characteristics of the material and select an appropriate welding method.
Furthermore, the selection of the welding method based on welding reliability, cost, etc. is also an important factor.
本発明は前述しように「ステンレス鋼と亜鉛鍍金炭素鋼板との面溶接構造」であるがステンレス鋼と炭素鋼板との溶接自体に従来からいろいろな問題点が指摘されおり単純にはいかない。
即ち、溶接材料の選定を誤ると、溶接により炭素鋼板の希釈を受けるので、溶接金ステンレス中のＮｉ、Ｃｒ含有量が減少し、脆く割れやすい組織になる。そこで、一般的にはＮｉ、Ｃｒ含有量の多い３０９系溶材を限定的に使用していた。
例えば３０９系溶接材料を用いて炭素鋼による希釈（溶接条件）をコントロールすればステンレス鋼板とほぼ同等の成分となるため、高温割れの生じない安定した溶接金属を得ることが出来ると言われている。As mentioned above, the present invention is a "surface welded structure of stainless steel and galvanized carbon steel plates," but various problems have been pointed out in the past in welding stainless steel and carbon steel plates, and it is not simple.
That is, if the welding material is incorrectly selected, the carbon steel plate will be diluted by welding, and the Ni and Cr contents in the weld stainless steel will decrease, resulting in a brittle and easily cracked structure. Therefore, in general, 309 series welding materials with high Ni and Cr contents have been used in a limited manner.
For example, if a 309 series welding material is used and the dilution with carbon steel (welding conditions) is controlled, the composition will be almost the same as that of a stainless steel sheet, so it is said that it is possible to obtain a stable weld metal without high-temperature cracking. .
ステンレス鋼ステンレス３０４（１８Ｃｒ－８Ｎｉ）と軟鋼（ＳＳ４１）の異材溶接をＤ３０９溶接棒を用いて継手溶接を行った場合、図６にあるシェフラーの状態図により、溶接金属の組成を推定することができる。ステンレス３０４（１８Ｃｒ－８Ｎｉ）と軟鋼（ＳＳ４１）のＮｉ当量（％Ｎｉ＋３０×％Ｃ＋０．５×％Ｍｎ）とＣｒ当量（％Ｃｒ＋％Ｍｏ＋１．５×％Ｓｉ＋０．５×％Ｎｂ）をそれぞれ算出し、図６にプロット（Ａ，Ｂ）する。両点を直線で結んだ中央が溶接点（Ｃ）となる。When joint welding of stainless steel 304 (18Cr-8Ni) and mild steel (SS41) is performed using a D309 welding rod, the composition of the weld metal can be estimated using the Schaeffler phase diagram shown in Figure 6. can. Calculate the Ni equivalent (%Ni+30×%C+0.5×%Mn) and Cr equivalent (%Cr+%Mo+1.5×%Si+0.5×%Nb) of stainless steel 304 (18Cr-8Ni) and mild steel (SS41), respectively. , plotted in Figure 6 (A, B). The center of the two points connected by a straight line is the welding point (C).
さらに、Ｄ３０９溶接棒のＮｉ当量、Ｃｒ当量をそれぞれ算出し、図６にプロット（Ｄ）すると、ここでＤ点とＣ点の直線上が溶接金属組成の存在するラインとなる。
母材への希釈が少ない段階では、溶接金属はＤ３０９の組成に近いオーステナイト＋フェライトの混合領域があり、希釈の増加に伴ってその組成はオーステナイト単層の預域を経て、オーステナイト＋マルテンサイトの混合領域へと変化していく。
ここで、溶接時の割れを防止するには、溶接金属の組成をオーステナイト＋フェライト混合領域にすることが有効であるので、この観点から溶接時の希釈をＥ点より右側（希釈率約３０％以下）になるようにする必要がある。実際の施工においては、磁気吹きの影響で軟鋼側の方がステンレス鋼側よりも希釈を受け、図６中のＣ点は軟鋼（Ｂ点）側に移動するので、希釈をさらに低めに抑える必要がある。一般的には、高温割れ防止の観点から溶接金属中のフェライト量を最低でも約３％以上確保することが必要とされている。軟鋼の炭素鋼板の板厚が厚い場合には、炭素鋼板の開先面に３０９系溶材にてバタリングを行い、溶接を行った方が耐割れ性の点から有効であると言われている。Furthermore, when the Ni equivalent and Cr equivalent of the D309 welding rod are calculated and plotted in FIG. 6 (D), the straight line between point D and point C becomes the line where the weld metal composition exists.
At a stage where there is little dilution into the base metal, the weld metal has a mixed region of austenite + ferrite similar to the composition of D309, and as the dilution increases, the composition changes from a deposited region of a single layer of austenite to a mixture of austenite + martensite. It is changing to a mixed area.
Here, in order to prevent cracking during welding, it is effective to make the composition of the weld metal a mixed region of austenite and ferrite, so from this point of view, dilution during welding should be made to the right of point E (dilution rate approximately 30%). below). In actual construction, the mild steel side is diluted more than the stainless steel side due to the influence of magnetic blowing, and point C in Figure 6 moves to the mild steel (point B) side, so it is necessary to keep the dilution to an even lower level. There is. Generally, from the viewpoint of preventing hot cracking, it is necessary to ensure that the amount of ferrite in the weld metal is at least about 3% or more. When the thickness of a mild carbon steel plate is thick, it is said to be more effective in terms of crack resistance to batter the grooved surface of the carbon steel plate with 309 series welding metal and then weld it.
このように従来からステンレス鋼と炭素鋼との異種金属溶接は簡単にはいかない。
本発明は、前記のように制限される溶接棒を用いることなく、従って希釈率を抑えることなく、オーステナイト＋フェライトの混合領域にすることなくしかも開先を加工することなく、溶接中のバタリングを防止して、溶接時の割れ、歪が無い健全な溶接を迅速簡単にしかも安価に可能にして、しかも、製作が極めて簡易であり、軽量化を有利に可能にしながら十分な溶接状態を有する「ステンレス鋼板と炭素鋼板との面溶接構造」の応用例として「ピット装置」を提供する。As described above, dissimilar metal welding of stainless steel and carbon steel has traditionally not been easy.
The present invention eliminates battering during welding without using a welding rod that is limited as described above, without suppressing the dilution rate, without creating a mixed region of austenite + ferrite, and without processing a groove. This method enables sound welding without cracking or distortion during welding, quickly, easily, and inexpensively. Furthermore, it is extremely simple to manufacture, advantageously enables weight reduction, and has sufficient welding condition. We provide a ``pit device'' as an application example of ``a surface welded structure of stainless steel plates and carbon steel plates''.
本発明は前述の課題を解決するものでありその技術的特徴は次の（１）～（２）の通りである。
（１）、ステンレス鋼板と亜鉛鍍金鋼板との面溶接構造において、前記ステンレス鋼板は、配管ピット又は排水ピットの開口部の蓋受枠体に開閉可能に支持された蓋体の四周枠とし、前記亜鉛鍍金鋼板は、前記蓋体の四周枠内に平面配置し上面に床仕上げ材を配置した床基板とし、前記ステンレス鋼板製の四周枠の内壁面と前記亜鉛鍍金鋼板製の床基板の外側端面との溶接部はファイバーレーザー溶接により前記ステンレス鋼板と亜鉛鍍金鋼板との合金層を形成してなることを特徴とするピット装置。
（２）、ステンレス鋼板と亜鉛鍍金鋼板との面溶接構造において、前記亜鉛鍍金鋼板は、配管ピット又は排水ピットの開口部の蓋体を開閉可能に支持する蓋受体の平面矩形状の底板枠とし、前記ステンレス鋼板は、前記底板枠の四周外端面に内面を接続する側面枠体とし、前記亜鉛鍍金鋼板の底板枠の四周外端面と前記ステンレス鋼板製の側面枠体の内面との溶接部はファイバーレーザー溶接により前記ステンレス鋼板と亜鉛鍍金鋼板との合金層を形成してなることを特徴とするピット装置The present invention solves the above-mentioned problems, and its technical features are as follows (1) and (2).
(1) In the surface welding structure of a stainless steel plate and a galvanized steel plate, the stainless steel plate is a four-periphery frame of a lid body that is openably and closably supported by a lid receiving frame body of an opening of a piping pit or a drainage pit, and the The plated steel plate is a floor substrate that is arranged flatly within the four-periphery frame of the lid body and has a floor finishing material arranged on the upper surface, and the inner wall surface of the four-periphery frame made of the stainless steel plate and the outer end surface of the floor substrate made of the galvanized steel plate. A pit device characterized in that the welded portion is formed by forming an alloy layer of the stainless steel plate and the galvanized steel plate by fiber laser welding.
(2) In the surface welding structure of a stainless steel plate and a galvanized steel plate, the galvanized steel plate is a rectangular planar bottom plate frame of a lid holder that supports the lid of the opening of the piping pit or the drainage pit in an openable and closable manner. and the stainless steel plate is a side frame whose inner surface is connected to the outer end surfaces of the four circumferences of the bottom plate frame, and the welded portion between the four circumferential outer end surfaces of the bottom plate frame of the galvanized steel plate and the inner surface of the side frame made of the stainless steel plate. is a pit device characterized by forming an alloy layer of the stainless steel plate and the galvanized steel plate by fiber laser welding.
本発明において使用するファイバーレーザー溶接とは一般に非接触で局所的な加熱が可能ビームの小径スポットによる高いエネルギー密度溶接スピードが高速ＣＷ（連続発振）溶接による連側照射ファイバーレーザーによる非接触溶接であるが、本発明の前記ピット装置において、蓋体の「ステンレス製の四周枠の上部内壁面との溶接相手を亜鉛鍍金鋼板製の側端部にして溶接する」、また前記蓋受枠体の「ステンレス製の四周枠の内壁面との溶接相手の平面矩形状の底板を亜鉛鍍金鋼板にして溶接する」ことによって、そのいずれの溶接部も引張強度が母材の亜鉛鍍金鋼板よりも高く得ることができる。
さらに該溶接部は焼けや歪みが殆ど無く、薄物でもきれいで滑らかな溶接ビードを実現し外観が美しく仕上がるので、溶接工程の大幅な削減を可能にした。
また溶接の際に発生するスパッタ（溶融金属の飛散）の発生が極端に少なく、従ってスパッタの固着の問題も皆無に近く、また溶接部表面にくぼみができないので仕上げ処理も不要である。
等々の優れた新規な作用効果を呈するため堅牢で安価なピット装置の製作が有利に可能になった。
これ等の作用効果は「ステンレス鋼板と単なる炭素鋼板とのファイバーレーザー面溶接」では全く得られない新規な作用効果である。The fiber laser welding used in the present invention is generally a non-contact welding method that enables localized heating in a non-contact manner.It is a high energy density welding speed using a small diameter spot of the beam.It is a non-contact welding using a continuous irradiation fiber laser using high-speed CW (continuous wave) welding. However, in the pit apparatus of the present invention, "the welding partner to the upper inner wall surface of the four-periphery frame made of stainless steel is welded to the side end made of galvanized steel plate", and the "stainless steel By welding the rectangular planar bottom plate to the inner wall surface of the four-frame frame made from zinc-plated steel sheets, it is possible to obtain higher tensile strength in both welded parts than the base material of the galvanized steel sheets. can.
Furthermore, the welded part has almost no burn or distortion, and even on thin materials, a clean and smooth weld bead is achieved, resulting in a beautiful finished appearance, making it possible to significantly reduce the number of welding processes.
In addition, the occurrence of spatter (scattering of molten metal) during welding is extremely low, so there is almost no problem of spatter sticking, and no dents are formed on the surface of the weld, so no finishing treatment is required.
It has become possible to advantageously manufacture a robust and inexpensive pit device because it exhibits excellent new functions and effects such as the following.
These effects are completely new effects that cannot be obtained by "fiber laser surface welding of a stainless steel plate and a simple carbon steel plate."
発明を実施するための形態を以下に紹介の図１～図５に示す実施例と共に詳細に説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS A mode for carrying out the invention will be described in detail below along with examples shown in FIGS. 1 to 5.
図１～図２（１）（２）において、本例の配管ピットＰの開口部ＰＯの蓋装置Ｆは、蓋体１００とこれを開閉可能にセットする蓋受枠体２００とからなる。
蓋体１００は、ステンレス３０４（１８Ｃｒ－８Ｎｉ）製の四周枠１０１と、前記四周枠１０１内に嵌めた亜鉛鍍金鋼板製の蓋１０２とからなる。In FIGS. 1 to 2 (1) and (2), the lid device F for the opening PO of the piping pit P of this example is composed of a lid body 100 and a lid receiving frame body 200 that is set so as to be openable and closable.
The lid body 100 consists of a four-circumference frame 101 made of stainless steel 304 (18Cr-8Ni), and a lid 102 made of a galvanized steel plate fitted into the four-circumference frame 101.
ステンレス３０４（１８Ｃｒ－８Ｎｉ）製の四周枠１０１は、厚み３．０ｍｍ 引張強度３８ｋｇ／ｍｍ２、硬度（ブリネルリネル硬さ：ＨＢＷ換算）≦１８７）であり、上部に多数の嵌込突起１０１Ｔを形成してある。
亜鉛鍍金鋼板製の蓋１０２は、平面矩形で母材ＳＳ４００の厚み３．２ｍｍ、引張強度４００－５１０Ｎ／ｍｍ、硬度（ブリネル硬さ：ＨＢＷ換算）１２０－４００、亜鉛目付量１５０ｇ／ｍ２であり、四周囲に前記嵌入口１０１ｉｎに嵌入する嵌込突起１０２ｏｕｔを形成する。
前記亜鉛鍍金鋼板製の蓋１０２の上面には、図１に示すように、下地モルタル充填層１０３を構成しその上に樹脂製の床仕上げ平板１０４を配置して成る。
前記四周枠１０１の下端部には、前記蓋受枠体２００の底板２０１の上面に当接する際のクッション材１０５を装着してある。The four-periphery frame 101 made of stainless steel 304 (18Cr-8Ni) has a thickness of 3.0 mm, a tensile strength of 38 kg/mm 2 , and a hardness (Brinell hardness: HBW conversion) ≦187), and has a large number of fitting protrusions 101T on the upper part. It has been done.
The lid 102 made of galvanized steel plate has a rectangular planar shape and has a base material SS400 with a thickness of 3.2 mm, a tensile strength of 400-510 N/mm, a hardness (Brinell hardness: HBW conversion) of 120-400, and a zinc basis weight of 150 g/ m2. Fitting protrusions 102out that fit into the fitting opening 101 inch are formed around the four peripheries.
As shown in FIG. 1, on the upper surface of the lid 102 made of the galvanized steel sheet, a base mortar filling layer 103 is formed, and a floor finishing flat plate 104 made of resin is arranged thereon.
A cushioning material 105 is attached to the lower end of the four-circumferential frame 101 for contacting the upper surface of the bottom plate 201 of the lid receiving frame 200.
更に図４において、（１）に示すように、ステンレス３０４製の四周枠１０１の前記嵌入口１０１ｉｎと、亜鉛鍍金鋼板製蓋１０２の嵌込突起１０２ｏｕｔとの溶接部Ｚ１、Ｚ２はファイバーレーザー溶接機による前記ステンレス鋼板と亜鉛鍍金鋼板との合金層を形成してなる。
前記溶接部Ｚ１、Ｚ２は、拡大して示すように、前記嵌入口１０１ｉｎの母材の鉄ＳＳ４００と鍍金亜鉛Ｚｎ及び嵌込突起１０２ｏｕｔの母材ステンレス３０４との合金層が微量に薄く均一に形成されている。
このファイバーレーザー溶接機による溶接部Ｚ１、Ｚ２の合金層は母材亜鉛鍍金鋼板の３９ｋｇ／ｍｍ２より充分に高い強度４３～５３ｋｇ／ｍｍ２を有していた。Further, in FIG. 4, as shown in (1), the welded parts Z1 and Z2 between the fitting opening 101 inch of the four-periphery frame 101 made of stainless steel 304 and the fitting protrusion 102out of the lid 102 made of galvanized steel plate are welded using a fiber laser welding machine. An alloy layer is formed of the stainless steel plate and the galvanized steel plate.
As shown in the enlarged view, the welded portions Z1 and Z2 are formed by a very thin and uniform alloy layer of the base material of iron SS400 and the plated zinc Zn of the insertion opening 101 inches, and the base material of stainless steel 304 of the insertion protrusion 102out. has been done.
The alloy layers of the welded parts Z1 and Z2 formed by this fiber laser welding machine had a strength of 43 to 53 kg/mm 2 which was sufficiently higher than the 39 kg/mm 2 of the base metal galvanized steel sheet.
図１と図３（１）（２）において、前記蓋受枠体２００は、平面矩形状の底板２０１と、四周枠２０２とからなる。
底板２０１は、亜鉛鍍金鋼板製（母材ＳＳ４００，厚み３．２ｍｍ、引張強度３９．４６ｋｇ／ｍｍ２、硬度（ブリネル硬さＨＢＷ換算）：１２０－４００、亜鉛目付量１２０ｇ／ｍ２である。
前記四周枠２０２は、ステンレス厚み３．２ｍｍ、硬度（ブリネルリネル硬さ：ＨＢＷ換算）≦１８７）である。
更に図４において、（２）に示すように、前記底板２０１の外側端面と、前記四周枠２０２の内側下部面との溶接部Ｚ３、Ｚ４はファイバーレーザー溶接機による亜鉛合金層である。
前記亜鉛合金層の溶接部Ｚ３、Ｚ４は、拡大して示すように、前記底板２０１の母材ＳＳ４００と鍍金亜鉛Ｚｎ及び前記四周枠２０２の母材ステンレス３０４との合金層が微量に薄く均一に形成されている。In FIG. 1 and FIGS. 3(1) and 3(2), the lid receiving frame 200 includes a bottom plate 201 having a rectangular planar shape and a four-periphery frame 202.
The bottom plate 201 is made of a galvanized steel plate (base material SS400, thickness 3.2 mm, tensile strength 39.46 kg/mm 2 , hardness (Brinell hardness converted to HBW): 120-400, zinc basis weight 120 g/m 2 ) .
The four-periphery frame 202 is made of stainless steel with a thickness of 3.2 mm and a hardness (Brinell hardness: HBW conversion)≦187).
Further, in FIG. 4, as shown in (2), the welded portions Z3 and Z4 between the outer end surface of the bottom plate 201 and the inner lower surface of the four-periphery frame 202 are zinc alloy layers formed by a fiber laser welder.
As shown in the enlarged view, the welded parts Z3 and Z4 of the zinc alloy layer are formed by a very thin and uniform alloy layer of the base material SS400 of the bottom plate 201, the plated zinc Zn, and the base material stainless steel 304 of the four-periphery frame 202. It is formed.
以上により得られた前記亜鉛合金層の溶接部Ｚ１～Ｚ４とその近傍は焼けや歪みが殆ど無く、強度も母材以上と高く安定しており、きれいで滑らかな溶接ビードが得られ、堅牢で外観が美しいピット装置に仕上がった。また溶接の際に発生するスパッタ（溶融金属の飛散）の発生が極端に少なく、溶接部表面にくぼみがなく、スパッタの固着の問題も皆無に近く仕上げ処理も不要であり、溶接加工工程及びコストの大幅な節減ができた。 The welded parts Z1 to Z4 of the zinc alloy layer obtained above and the vicinity thereof have almost no burning or distortion, the strength is higher and more stable than the base metal, and a clean and smooth weld bead is obtained, which is strong. The result is a pit device with a beautiful appearance. In addition, there is extremely little spatter (scattering of molten metal) that occurs during welding, there are no depressions on the weld surface, there is almost no problem of spatter sticking, and no finishing treatment is required, reducing the welding process and cost. This resulted in significant savings.
前例の他の例として、表１には前記亜鉛鍍金鋼板とステンレス３０４鋼板との面溶接の組み合わせ仕様によるファイバーレーザー溶接機による溶接部の合金層の強度の実験例を４例紹介する。 As another example of the previous example, Table 1 introduces four experimental examples of the strength of the alloy layer of the welded part by a fiber laser welding machine based on the combination specification of surface welding of the above-mentioned galvanized steel plate and stainless steel 304 steel plate.
表２に前記ファイバーレーザー溶接機詳細仕様例を示す。
Table 2 shows an example of detailed specifications of the fiber laser welding machine.
表１の例１における溶接部の合金層は図５の（１）に顕微鏡写真を、その拡大スケッチ図を図５の（２）に記載し、図５の（２）に示す成分測定点Ａ～Ｆの成分分析測定値は表３に記載の通りであった。
本発明は、前述の効果及び実施例に記載のとおり優れた作用効果を呈するものであり、金属加工業界等に貢献すること多大なものがある。 The present invention exhibits excellent effects as described in the above-mentioned effects and examples, and will greatly contribute to the metal processing industry and the like.
Ｐ：配管ピット
ＰＯ：開口部
Ｆ：蓋装置
１００：蓋体
１０１：ステンレス製の四周枠
１０２：平面矩形の亜鉛鍍金鋼板製蓋
１０３：下地のモルタル充填層
１０４：樹脂製の床仕上げ平板
２００：蓋受枠体
２０１：平面矩形状で亜鉛鍍金鋼板製の底板
２０２：ステンレス製の四周枠
Ｚ１～Ｚ４：ファイバーレーザー溶接部P: Piping pit PO: Opening F: Lid device 100: Lid body 101: Stainless steel four-periphery frame 102: Planar rectangular galvanized steel plate lid 103: Base mortar filling layer 104: Resin floor finishing flat plate 200: Lid holder frame 201: Rectangular in plane and made of galvanized steel plate Bottom plate 202: Four-periphery frame made of stainless steel Z1 to Z4: Fiber laser welded part
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07228316A (en) * | 1994-02-14 | 1995-08-29 | Morimatsu Kogyo Kk | Underground type liquid storage tank |
| JP2017179827A (en) * | 2016-03-30 | 2017-10-05 | 株式会社カナサシテクノサービス | Reinforcement structure for underground volume structure |
| JP3219873U (en) * | 2018-11-05 | 2019-01-31 | 株式会社日本ピット | Wiring and piping pit structure |
| JP2019188921A (en) * | 2018-04-20 | 2019-10-31 | 末吉工業株式会社 | Composite tank |
| JP3232621U (en) * | 2021-02-17 | 2021-06-24 | 株式会社日本ピット | Lid |
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| JP7228316B1 (en) | 2022-10-03 | 2023-02-24 | 泰三郎 酒井 | Multicopter type electric airplane |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07228316A (en) * | 1994-02-14 | 1995-08-29 | Morimatsu Kogyo Kk | Underground type liquid storage tank |
| JP2017179827A (en) * | 2016-03-30 | 2017-10-05 | 株式会社カナサシテクノサービス | Reinforcement structure for underground volume structure |
| JP2019188921A (en) * | 2018-04-20 | 2019-10-31 | 末吉工業株式会社 | Composite tank |
| JP3219873U (en) * | 2018-11-05 | 2019-01-31 | 株式会社日本ピット | Wiring and piping pit structure |
| JP3232621U (en) * | 2021-02-17 | 2021-06-24 | 株式会社日本ピット | Lid |
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