JP2593233B2 - Liquid tank manufacturing method - Google Patents
Liquid tank manufacturing methodInfo
- Publication number
- JP2593233B2 JP2593233B2 JP2114187A JP11418790A JP2593233B2 JP 2593233 B2 JP2593233 B2 JP 2593233B2 JP 2114187 A JP2114187 A JP 2114187A JP 11418790 A JP11418790 A JP 11418790A JP 2593233 B2 JP2593233 B2 JP 2593233B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- tapered portion
- gap
- tank
- lid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、電気温水器の貯湯タンク等のように液体を
貯めるための液体用タンクの製造方法に関するものであ
る。The present invention relates to a method for manufacturing a liquid tank for storing a liquid, such as a hot water storage tank of an electric water heater.
［従来の技術］ 通常、液体用タンクは薄肉の金属材からなる筒状の胴
体の両端に薄肉の金属材からなる蓋体を溶接した構造に
なっている。従来、胴体の端部と蓋体とを溶接する場合
の蓋体と胴体の端部との継手の形状として、蓋体の周縁
部に胴体の端部が挿入されて嵌合される環状の嵌合部ま
たはテーパ部を設けたものが知られている。第５図
（Ａ）は特開昭52−84550号公報に示され温水器の貯湯
タンクの継手構造である。この例では、蓋体１の周縁部
に、胴体２の端部の外周面2a及び胴体２の端部の端面2b
と接触する内壁面を有する嵌合部３が設けられている。
溶接は嵌合部３の外側から行われ、溶接後の状態は第５
図（Ｂ）に示すようになる。また第６図（Ａ）は特開昭
62−296969号公報に示されたタンクを製造する場合の継
手構造を示している。この継手構造では、蓋体１の周縁
部にテーパ部４が設けられている。このテーパ部４は、
胴体２の端部の端面との間に径方向内側に向かって開口
する環状の間隙５を形成するように構成されている。こ
の例では、溶接はタンク内側から溶接トーチ６を用いて
行っており、溶接トーチ６から溶接ワイヤを供給して間
隙５に溶融金属を充填することにより、蓋体１と胴体２
の端部とを溶接する。溶接後の状態は第６図（Ｂ）に示
すようになる。[Related Art] Usually, a liquid tank has a structure in which lids made of a thin metal material are welded to both ends of a cylindrical body made of a thin metal material. Conventionally, as a shape of a joint between the lid and the end of the fuselage when welding the end of the fuselage and the lid, an annular fitting in which the end of the fuselage is inserted and fitted to the peripheral edge of the lid. The one provided with a joint portion or a tapered portion is known. FIG. 5 (A) shows a joint structure of a hot water storage tank of a water heater disclosed in Japanese Patent Application Laid-Open No. 52-84550. In this example, the outer peripheral surface 2a at the end of the body 2 and the end surface 2b at the end of the body 2
There is provided a fitting portion 3 having an inner wall surface that makes contact with the inner wall.
The welding is performed from the outside of the fitting portion 3, and the state after the welding is the fifth.
The result is as shown in FIG. Also, FIG.
1 shows a joint structure in the case of manufacturing the tank disclosed in JP-A-62-296969. In this joint structure, a tapered portion 4 is provided on a peripheral portion of the lid 1. This tapered portion 4
An annular gap 5 that opens radially inward is formed between the end face of the body 2 and the end face. In this example, welding is performed using a welding torch 6 from the inside of the tank, and a welding wire is supplied from the welding torch 6 to fill the gap 5 with molten metal, thereby forming the lid 1 and the body 2.
Weld with the end. The state after welding is as shown in FIG. 6 (B).
［発明が解決しようとする課題］ 従来のいずれの方法で溶接を行っても、蓋体に設けた
嵌合部３またはテーパ部４は胴体２の外側に残ってい
る。そのため嵌合部３またはテーパ部４の端部と胴体２
の外周面との間には、必ず段部Ｓまたは隙間が形成され
ることになる。また第５図（Ａ）の継手構造では、胴体
２の外周面2aと端面2bを嵌合部３の内壁面に接触させて
いるため、溶融金属が溜まる部分がなく、タンクの内面
に比較的大きな裏波ビードＢが形成されることになり、
裏波ビートＢの両端にも大きな段部Ｓが形成される。第
６図の方法で両側の蓋体を溶接できれば、タンクの内面
側に段部が形成されることは防げるが、タンクの内側か
ら溶接するこの方法で胴体の両側に蓋体を溶接すること
はできない。そのため、他方の蓋体は別の溶接方法によ
って溶接せざるを得ず、結局タンクの内面に大きな段部
が形成される可能性があった。タンクの内面に大きな段
部Ｓが形成されると、この段部にタンク内の液体中の異
物が貯まって溶接部の腐触発生原因となる。[Problems to be Solved by the Invention] The fitting portion 3 or the tapered portion 4 provided on the lid remains outside the body 2 irrespective of the conventional welding method. Therefore, the end of the fitting portion 3 or the tapered portion 4 and the body 2
A step S or a gap is always formed between the outer peripheral surface and the outer peripheral surface. In the joint structure of FIG. 5 (A), since the outer peripheral surface 2a and the end surface 2b of the body 2 are in contact with the inner wall surface of the fitting portion 3, there is no portion where molten metal is accumulated, and the inner surface of the tank is relatively thin. Large Uranami beads B will be formed,
Large steps S are also formed at both ends of the Uranami beat B. If the lids on both sides can be welded by the method of FIG. 6, it is possible to prevent a step from being formed on the inner surface side of the tank, but it is impossible to weld the lids on both sides of the body by this method of welding from the inside of the tank. Can not. For this reason, the other lid has to be welded by another welding method, and eventually a large step may be formed on the inner surface of the tank. When a large step S is formed on the inner surface of the tank, foreign matters in the liquid in the tank accumulate on this step, causing corrosion of the welded portion.
またビード部は、溶接時の溶融−凝固の過程での結晶
組織の肥大及び酸化による材質変化によって、母材と比
べて耐食性が劣るようになるため、タンクの内面に露出
するビードの面積を小さくすることが好ましいことが判
っている。しかしながら第５図（Ｂ）に示されるよう
に、前者の方法ではタンクの内側に突出するビードの量
が多くなりやすいため、その分溶接部の耐食性が悪いと
いう問題があった。In addition, the bead portion becomes inferior to the base metal in corrosion resistance due to the material change due to the crystal structure enlargement and oxidation in the process of melting and solidification during welding, so that the area of the bead exposed on the inner surface of the tank is reduced. Has been found to be preferable. However, as shown in FIG. 5 (B), the former method has a problem that the amount of beads protruding into the tank tends to increase, and accordingly, the corrosion resistance of the welded portion is poor.
更に貯湯タンク等のようにタンクがグラスウール等の
塩素イオンを含む保温材で覆われるタンクでは、タンク
の外面の隙間に保温材から溶出された塩素イオンを含む
水分が溜まり、徐々に塩素イオン濃度が高くなって隙間
腐触が発生し、タンクの寿命が短くなる問題があった。Further, in a tank such as a hot water storage tank where the tank is covered with a heat insulating material containing chlorine ions such as glass wool, water containing chlorine ions eluted from the heat insulating material accumulates in gaps on the outer surface of the tank, and the chlorine ion concentration gradually decreases There was a problem that the height of the tank increased and corrosion of the gap occurred, thereby shortening the life of the tank.
本発明の目的は、タンクの外面及び内面に腐触の原因
となるような大きな段部や間隙を形成することなく液体
用タンクを製造することができる方法を提供することに
ある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a liquid tank without forming large steps or gaps that may cause corrosion on the outer and inner surfaces of the tank.
［課題を解決するための手段］ 本発明の方法は、周縁部に径方向外側に拡がる環状の
テーパ部が形成された薄肉の金属材からなる蓋体のテー
パ部内に薄肉の金属材からなる筒状の胴体の胴体端部を
挿入して嵌め合わせ、テーパ部と胴体端部とを溶接する
ことにより液体用タンクを製造する方法を対象とする。[Means for Solving the Problems] The method of the present invention is directed to a cylinder made of a thin metal material inside a tapered portion of a thin metal material having an annular tapered portion formed on a peripheral portion and extending radially outward. A method for manufacturing a liquid tank by inserting and fitting a body end of a torso-shaped body and welding the tapered portion and the body end.
本発明では、蓋体のテーパ部を、その内壁面が胴体端
部の端面の外周縁部と当接して該端面との間に径方向内
側に向かって開く環状の第１の間隙を形成し且つ胴体端
部の外周面との間に軸線方向に向かって開く環状の第２
の間隙を形成するように加工する。テーパ部の軸線方向
の長さは、テーパ部が溶接アークによって完全に溶融し
た際に溶融金属により第１の間隙を完全に埋め且つ溶接
部と蓋体及び胴体の内周面及び外周面との間に腐触の発
生原因となるような段部を生じさせない長さに設定す
る。そして胴体を横向きにしてテーパ部の外側からテー
パ部を完全に溶融させるようにアーク溶接を行う。According to the present invention, the first tapered portion of the lid has an inner wall surface that abuts against the outer peripheral edge of the end surface of the body end to form an annular first gap that opens radially inward with the end surface. And an annular second opening that opens in the axial direction between the outer peripheral surface of the body end and the outer peripheral surface.
Is processed to form a gap. The length of the tapered portion in the axial direction is such that when the tapered portion is completely melted by the welding arc, the first gap is completely filled with the molten metal, and the gap between the welded portion and the inner peripheral surface and the outer peripheral surface of the lid and the body is formed. The length is set so as not to cause a step portion which causes corrosion between them. Then, arc welding is performed so that the tapered portion is completely melted from outside the tapered portion with the body turned sideways.
［作 用］ テーパ部の内壁面と胴体端部の外周面との間に軸線方
向に向かって開く環状の第２の間隙を形成してあるた
め、テーパ部を溶接アークで溶融させる際に、テーパ部
から熱が胴体側に逃げるのを防止できる。そのためテー
パ部の完全溶融が可能になり、溶接後にタンクの外面に
テーパ部が残ることがない。そして胴体を横向きに配置
するため、溶接アークでテーパ部を溶融させると、溶融
金属は胴体端部の端面とテーパ部の内壁面との間に形成
された環状の第１の間隙を埋めるように移動し、その後
は表面張力により１つにまとまって溶融していない蓋体
と胴体の間に滑らかな溶融部を形成する。本発明ではテ
ーパ部が溶接ワイヤまたは溶加棒の役割を果たしてい
る。特に本発明ではテーパ部の軸線方向を長さを、テー
パ部が溶接アークによって完全に溶融した際に溶融金属
により第１の間隙を完全に埋め且つ溶接部と蓋体及び胴
体の内周面及び外周面との間に腐触の発生原因となるよ
うな段部を生じさせない長さにしているため、腐触しに
くい溶接部を形成することができる。[Operation] Since an annular second gap that opens in the axial direction is formed between the inner wall surface of the tapered portion and the outer peripheral surface of the body end portion, when the tapered portion is melted by the welding arc, It is possible to prevent heat from escaping from the tapered portion to the body. Therefore, the tapered portion can be completely melted, and the tapered portion does not remain on the outer surface of the tank after welding. When the tapered portion is melted with a welding arc to dispose the fuselage sideways, the molten metal fills the first annular gap formed between the end surface of the fuselage end and the inner wall surface of the tapered portion. After that, they move together to form a smooth fused portion between the unfused lid and the body due to surface tension. In the present invention, the tapered portion serves as a welding wire or a filler rod. In particular, in the present invention, the length in the axial direction of the tapered portion, the first gap is completely filled with molten metal when the tapered portion is completely melted by the welding arc, and the welded portion, the inner peripheral surface of the lid and the body, and Since the length is set so as not to cause a stepped portion which causes the occurrence of corrosion between the outer peripheral surface and the outer peripheral surface, it is possible to form a welded portion which is hardly corroded.
［実施例］ 以下図面を参照して本発明の実施例を詳細に説明す
る。Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.
本発明の製造方法の実施例を、温水器の貯湯タンクを
製造する場合を例にとって説明する。第１図は本発明の
方法で製造する貯湯タンクの溶接前の概略構成を示して
いる。同図において、10は厚みが0.8〜1.0mmのフェライ
ト系ステンレス鋼（SUS444相当）からなる円筒状の胴体
であり、11及び12も胴体と同じ材料で製造された蓋体で
ある。なおこの蓋体は一般的に鏡板と呼ばれている。蓋
体11及び12には図示していないが給水口及び給湯口が形
成されている。第２図（Ａ）には、第１図のＡ部の拡大
部分断面図を示してある。以下蓋体11及び12は構造が同
じであるため、代表して蓋体11の構造及びその溶接につ
いて説明する。蓋体11の周縁部13には径方向外側に拡が
る環状のテーパ部14が形成されている。蓋体11は、テー
パ部14の基部14aと連続する部分11aの内周面11a1が胴体
10の内周面10aとほぼ面一になるように形状が定められ
ている。An embodiment of the manufacturing method of the present invention will be described by taking a case of manufacturing a hot water storage tank of a water heater as an example. FIG. 1 shows a schematic configuration of a hot water storage tank manufactured by the method of the present invention before welding. In FIG. 1, reference numeral 10 denotes a cylindrical body made of ferritic stainless steel (equivalent to SUS444) having a thickness of 0.8 to 1.0 mm, and reference numerals 11 and 12 also denote lids made of the same material as the body. This lid is generally called a mirror plate. Although not shown, the lids 11 and 12 are formed with a water supply port and a hot water supply port. FIG. 2A is an enlarged partial cross-sectional view of a portion A in FIG. Since the lids 11 and 12 have the same structure, the structure of the lid 11 and the welding thereof will be described as representatives. An annular tapered portion 14 extending radially outward is formed on a peripheral portion 13 of the lid 11. The lid 11 has an inner peripheral surface 11a1 of a portion 11a that is continuous with the base 14a of the tapered portion 14.
The shape is determined so as to be substantially flush with the inner peripheral surface 10a of the ten.
テーパ部14は、プレス成形によって１回の絞り加工で
成形したものである。テーパ部14の基部14aは絞り加工
によって湾曲しており、その他の部分は胴体10から離れ
るように直線的に延びている。テーパ部14の形状は、そ
の内壁面（内周面）14bが胴体10の一方の端部（胴体端
部）10bの端面10cの外周縁部10c1と当接して外端面10c
との間に径方向内側に向かって開く環状の第１の間隙g1
を形成し且つ胴体端部10bの外周面10dとの間に軸線方向
（胴体10の他方の端部に向かう方向）に向かって開く環
状の第２の間隙g2を形成するように加工されている。第
１の間隙g1は、テーパ部14を溶融させた溶融金属により
埋められる。この間隙g1の容積があまり小さいと、第５
図（Ａ）で説明した従来の方法で用いる継手と同様に、
溶融金属がタンク内側に必要以上に膨出することになる
ため、間隙g1の容積は溶融金属が凝固して形成されるビ
ードがタンクの内側に必要以上に膨出しないように定め
られる。第２の間隙g2は、溶接アークによって加熱され
るテーパ部14の熱が胴体10側に逃げるのを防止してい
る。第５図（Ａ）で説明した従来の方法で用いる継手で
は、テーパ部14に相当する嵌合部３が胴体２と接触して
いて熱が胴体部に逃げるため、嵌合部３を完全に溶融さ
せることが非常に難しく、第５図（Ｂ）に示すように、
嵌合部３の一部がタンクの外側に残るのである。なおこ
の間隙g2の径方向の幅またはテーパ部14と胴体10との間
の角度は、テーパ部14を溶融させて得た溶融金属が、第
２図（Ｂ）に示すように１ケ所にまとまる程度に定める
のが好ましい。本実施例では、間隙g2の径方向の幅寸法
を最大で約1.0mmにして良好な溶接結果が得られること
が確認された。The tapered portion 14 is formed by a single drawing process by press forming. The base portion 14a of the tapered portion 14 is curved by drawing, and the other portions linearly extend away from the body 10. The shape of the tapered portion 14 is such that the inner wall surface (inner peripheral surface) 14b is in contact with the outer peripheral edge portion 10c1 of the end surface 10c of one end portion (body end portion) 10b of the body 10, and the outer end surface 10c
An annular first gap g1 that opens radially inward between
And is formed so as to form an annular second gap g2 that opens in the axial direction (direction toward the other end of the body 10) with the outer peripheral surface 10d of the body end 10b. . The first gap g1 is filled with a molten metal obtained by melting the tapered portion. If the volume of the gap g1 is too small, the fifth
Similar to the joint used in the conventional method described in FIG.
Since the molten metal expands more than necessary inside the tank, the volume of the gap g1 is determined so that the bead formed by solidifying the molten metal does not expand more than necessary inside the tank. The second gap g2 prevents the heat of the tapered portion 14 heated by the welding arc from escaping to the body 10 side. In the joint used in the conventional method described with reference to FIG. 5A, since the fitting portion 3 corresponding to the tapered portion 14 is in contact with the body 2 and heat escapes to the body, the fitting portion 3 is completely removed. It is very difficult to melt, and as shown in FIG.
Part of the fitting portion 3 remains outside the tank. The width of the gap g2 in the radial direction or the angle between the tapered portion 14 and the body 10 is such that the molten metal obtained by melting the tapered portion 14 is gathered at one location as shown in FIG. 2 (B). It is preferable to determine the degree. In this example, it was confirmed that a good welding result was obtained by setting the radial width of the gap g2 to about 1.0 mm at the maximum.
テーパ部14の軸線方向の長さは、溶接アークによって
完全に溶融した際に、溶融金属により第１の間隙g1を完
全に埋め且つ溶接部15と蓋体11及び胴体10の内周面及び
外周面との間に腐触の発生原因となるような段部を生じ
させない長さに設定する。本実施例では、テーパ部14の
長さを約5mmに設定して良好な溶接結果が得られること
が確認された。The length of the tapered portion 14 in the axial direction is such that when completely melted by the welding arc, the first gap g1 is completely filled with the molten metal, and the inner circumferential surface and the outer circumferential surface of the welded portion 15, the lid 11, and the body 10 are formed. The length is set so as not to cause a stepped portion which may cause corrosion between the surface and the surface. In this example, it was confirmed that good welding results were obtained by setting the length of the tapered portion 14 to about 5 mm.
次に溶接方法について説明する。第３図（Ａ）は溶接
装置の一例を示しており、第３図（Ｂ）は第３図（Ａ）
のＢ部の拡大斜視図を示している。本実施例ではTIG溶
接により溶接を行う。第３図（Ａ）の溶接装置では、胴
体10の両側に同時に蓋体11及び12を溶接する。Next, a welding method will be described. FIG. 3 (A) shows an example of the welding apparatus, and FIG. 3 (B) shows FIG. 3 (A).
2 shows an enlarged perspective view of a portion B of FIG. In this embodiment, welding is performed by TIG welding. In the welding apparatus shown in FIG. 3A, the lids 11 and 12 are simultaneously welded to both sides of the body 10.
第３図（Ａ）において、16は溶接装置のベースであ
り、このベース16には固定壁部17と可動壁部18とが設け
られ、またベースの中央部には胴体11を回動可能に支持
する支持ローラ19及び20が固定されている。固定壁部17
及び可動壁部18には、それぞれTIG溶接機21及び22と蓋
体11及び12を胴体10側に密着させるように加圧しながら
被溶接タンクを回転させる回転駆動装置23及び24が設け
られている。可動壁部18には、被溶接タンク内にアルゴ
ンガスを供給するためのガス供給管25が保持されてい
る。TIG溶接機21及び22は、溶接トーチ21a及び22aと該
トーチを上下左右に移動させるトーチ移動装置21b及び2
2bとを備えている。また溶接トーチの後方には、第３図
（Ｂ）に示すようにアフタシールドボックス22cが設け
られる。In FIG. 3 (A), reference numeral 16 denotes a base of the welding device. The base 16 is provided with a fixed wall portion 17 and a movable wall portion 18, and the body 11 is rotatable at the center of the base. Support rollers 19 and 20 for supporting are fixed. Fixed wall 17
And the movable wall portion 18 are provided with rotation drive devices 23 and 24 for rotating the tank to be welded while applying pressure so that the TIG welding machines 21 and 22 and the lids 11 and 12 are brought into close contact with the body 10 side, respectively. . The movable wall portion 18 holds a gas supply pipe 25 for supplying argon gas into the tank to be welded. TIG welding machines 21 and 22 include welding torches 21a and 22a and torch moving devices 21b and 2 for moving the torch up, down, left and right.
2b. An after-shield box 22c is provided behind the welding torch as shown in FIG. 3 (B).
この溶接装置を用いて行った溶接試験について説明す
る。試験に用いた蓋体及び胴体は、新日本製鐵株式会社
製の製品番号YUS190のフェライト系ステンレス鋼で製造
したもので、ステンレス鋼の厚みは0.8mmであった。そ
して胴体の直径は58cm、テーパ部14の長さＬは約4mm、
第１の間隙g1の最大幅寸法は約1mm、第２の間隙g2の最
大幅寸法は約1mmであった。また溶接線に対する溶接ト
ーチの傾斜角度は約40゜、溶接速度は400mm/分、溶接電
流は第４図に示すようなベース電流が20Aで最大電流が1
40A、周波数が5Hzでデューティ比（パルス幅）が50％の
パルスを用いた。この条件でしかもアルゴンガス雰囲気
中で溶接を行ったところ、第２図（Ｂ）に示すように、
テーパ部を完全に溶融させて、滑らかな溶接部15を得る
ことができた。なおこの例では溶接電流を140Aより小さ
くすると、第２図（Ｃ）に示すようにテーパ部14の端部
が溶融せずに残ることが確認された。なお最適な溶接条
件は、鋼板の材質及び厚み、テーパ部の形状及び寸法等
によって異なってくるのは勿論である。よって本発明を
実施するにあたって溶接装置及び溶接条件は、実施例に
限定されるものではない。A welding test performed using this welding device will be described. The lid and body used in the test were manufactured from Nippon Steel Corporation product number YUS190 ferritic stainless steel, and the thickness of the stainless steel was 0.8 mm. And the diameter of the body is 58 cm, the length L of the tapered part 14 is about 4 mm,
The maximum width of the first gap g1 was about 1 mm, and the maximum width of the second gap g2 was about 1 mm. The angle of inclination of the welding torch with respect to the welding line was about 40 °, the welding speed was 400 mm / min, and the welding current was 20 A at the base current as shown in FIG.
A pulse with a frequency of 40 A, a frequency of 5 Hz, and a duty ratio (pulse width) of 50% was used. When welding was performed under these conditions and in an argon gas atmosphere, as shown in FIG. 2 (B),
The tapered portion was completely melted, and a smooth welded portion 15 was obtained. In this example, when the welding current was smaller than 140 A, it was confirmed that the end of the tapered portion 14 remained without melting as shown in FIG. 2 (C). The optimum welding conditions naturally depend on the material and thickness of the steel sheet, the shape and size of the tapered portion, and the like. Therefore, in practicing the present invention, the welding apparatus and welding conditions are not limited to the examples.
上記実施例によれば、テーパ部14をプレス加工による
一工程で形成できるため、蓋体の製造が容易である上、
径方向外側に拡がるテーパ部14は胴体10との嵌合を容易
にし、しかもテーパ部14及び胴体10の寸法精度または突
き合わせ精度を緩和することができる。According to the above embodiment, since the tapered portion 14 can be formed in one step by press working, the lid can be easily manufactured,
The tapered portion 14 extending outward in the radial direction facilitates the fitting with the body 10, and can reduce the dimensional accuracy or butting accuracy of the tapered portion 14 and the body 10.
［発明の効果］ 本発明によれば、タンクの内面及び外面に腐触の原因
となるような段部または間隙を形成することなく、液体
用タンクを製造することができる。特に本発明によれ
ば、テーパ部の内壁面と胴体端部の外周面との間に軸線
方向に向かって開く環状の第２の間隙を形成するため、
テーパ部を溶接アークで溶接させる際に、テーパ部から
熱が胴体側に逃げるのを防止することができ、そのため
テーパ部の完全溶融が可能になって、溶接後にタンクの
外面にテーパ部が残るのを確実に防止できる。また第１
の間隙があるために、溶接ビードが必要以上にタンクの
内側に膨出することがなく、タンク内に露出する溶接ビ
ードの面積を小さく且つ滑らかにして溶接部の耐食性を
向上させることができる。[Effects of the Invention] According to the present invention, a liquid tank can be manufactured without forming a step portion or a gap that may cause corrosion on the inner surface and the outer surface of the tank. In particular, according to the present invention, in order to form an annular second gap that opens in the axial direction between the inner wall surface of the tapered portion and the outer peripheral surface of the body end,
When welding the tapered portion with a welding arc, heat can be prevented from escaping from the tapered portion to the fuselage side, so that the tapered portion can be completely melted, and the tapered portion remains on the outer surface of the tank after welding Can be reliably prevented. Also the first
Since the gap is provided, the weld bead does not protrude more than necessary inside the tank, and the area of the weld bead exposed in the tank can be made small and smooth, thereby improving the corrosion resistance of the welded portion.
第１図は本発明の方法によって製造する貯湯タンクの溶
接前の状態を示す概略断面図、第２図（Ａ）は第１図の
Ａ部の拡大図、第２図（Ｂ）は良好な溶接が行われたと
きの溶接部の状態を示す断面図、第２図（Ｃ）は溶接が
不十分なときの溶接部の状態を示す図、第３図（Ａ）は
溶接装置の一例を示す図、第３図（Ｂ）は第３図（Ａ）
のＢ部の拡大斜視図、第４図は溶接電流の波形を示す線
図、第５図（Ａ）は従来の製造方法で用いられていた継
手の構造を示す断面図、第５図（Ｂ）は第５図（Ａ）の
継手を溶接した状態を示す断面図、第６図（Ａ）は従来
の他の製造方法を説明するための図、第６図（Ｂ）は第
６図（Ａ）の方法で溶接した溶接部の状態を示す断面図
である。 1,11,12……蓋体、2,10……胴体、10b……胴体端部、３
……嵌合部、13……周縁部、4,14……テーパ部、15……
溶接部、g1……環状の第１の間隙、g2……環状の第２の
間隙。FIG. 1 is a schematic sectional view showing a state before welding of a hot water storage tank manufactured by the method of the present invention, FIG. 2 (A) is an enlarged view of a portion A of FIG. 1, and FIG. FIG. 2C is a cross-sectional view showing a state of the welded portion when welding is performed, FIG. 2C is a diagram showing a state of the welded portion when welding is insufficient, and FIG. 3A is an example of a welding device. FIG. 3 (B) shows FIG. 3 (A).
FIG. 4 is a diagram showing a waveform of a welding current, FIG. 5 (A) is a sectional view showing the structure of a joint used in a conventional manufacturing method, and FIG. 5 (B). ) Is a sectional view showing a state where the joint of FIG. 5 (A) is welded, FIG. 6 (A) is a view for explaining another conventional manufacturing method, and FIG. 6 (B) is FIG. 6 ( It is sectional drawing which shows the state of the welding part welded by the method of A). 1,11,12 ... lid, 2,10 ... trunk, 10b ... trunk end, 3
... fitting part, 13 ... peripheral part, 4, 14 ... taper part, 15 ...
Weld, g1... Annular first gap, g2... Annular second gap.
Claims (1)
部が形成された薄肉の金属材からなる蓋体の前記テーパ
部内に薄肉の金属材からなる筒状の胴体の胴体端部を挿
入して嵌め合わせ、前記テーパ部と前記胴体端部とを溶
接することにより液体用タンクを製造する方法におい
て、 前記蓋体の前記テーパ部を、その内壁面が前記胴体端部
の端面の外周縁部と当接して該端面との間に径方向側に
向かって開く環状の第１の間隙を形成し且つ前記胴体端
部の外周面との間に軸線方向に向かって開く環状の第２
の間隙を形成するように加工し、 前記テーパ部の軸線方向の長さを該テーパ部が溶接アー
クによって完全に溶融した際に溶融金属により前記第１
の間隙を完全に埋め且つ溶接部と前記蓋体及び前記胴体
の内周面及び外周面との間に腐触の発生原因となるよう
な段部を生じさせない長さに設定し、 前記胴体を横向きにして前記テーパ部の外側から前記テ
ーパ部を完全に溶融させるようにアーク溶接を行うこと
を特徴とする液体用タンクの製造方法。1. An end portion of a cylindrical body made of a thin metal material is inserted into the tapered portion of a thin metal material having an annular tapered portion formed radially outward at a peripheral portion thereof. A method for manufacturing a liquid tank by welding the tapered portion and the body end, wherein the inner wall surface of the tapered portion of the lid has an outer peripheral edge of an end surface of the body end. An annular first gap that abuts on the outer surface and opens radially between the end surface and the second end and an annular second opening that opens axially between the outer end surface and the outer peripheral surface of the body end portion
When the taper portion is completely melted by the welding arc, the length of the taper portion in the first direction is changed by the molten metal.
Is set to a length that completely fills the gap and does not generate a step that causes corrosion between the welded portion and the inner peripheral surface and the outer peripheral surface of the lid and the body. A method for manufacturing a liquid tank, comprising performing arc welding so that the taper portion is completely melted from the outside of the taper portion while being turned sideways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2114187A JP2593233B2 (en) | 1990-04-27 | 1990-04-27 | Liquid tank manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2114187A JP2593233B2 (en) | 1990-04-27 | 1990-04-27 | Liquid tank manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH049276A JPH049276A (en) | 1992-01-14 |
| JP2593233B2 true JP2593233B2 (en) | 1997-03-26 |
Family
ID=14631378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2114187A Expired - Fee Related JP2593233B2 (en) | 1990-04-27 | 1990-04-27 | Liquid tank manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2593233B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029494A (en) * | 2010-12-31 | 2011-04-27 | 杭州余杭獐山钢瓶有限公司 | Comprehensive steel cylinder welding machine |
| JP2012148304A (en) * | 2011-01-19 | 2012-08-09 | Mitsubishi Electric Corp | Method for welding thin plate member and method for manufacturing can body using the method |
| WO2019026568A1 (en) | 2017-07-31 | 2019-02-07 | ダイキン工業株式会社 | Tank manufacturing method, mirror plate of tank, and tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4959937B2 (en) | 2004-12-27 | 2012-06-27 | 株式会社日立産機システム | Distribution transformer with corrosion diagnostic components |
| JP5253367B2 (en) * | 2009-12-09 | 2013-07-31 | 三菱電機株式会社 | Thin plate member welding method and can manufacturing method using the method |
| GB2478015B (en) * | 2010-05-10 | 2012-02-22 | Warmflow Engineering Company Ltd | Cylinder |
| JP5693353B2 (en) * | 2011-04-27 | 2015-04-01 | 三菱電機株式会社 | Can body manufacturing apparatus and can body manufacturing method using the manufacturing apparatus |
| CN104400272B (en) * | 2014-11-20 | 2017-04-19 | 无锡锡山安达防爆电气设备有限公司 | Horizontal automatic welding machine for radiating fin of motor steel plate case |
| JP6274473B2 (en) * | 2015-03-12 | 2018-02-07 | 三菱電機株式会社 | Can body manufacturing apparatus and can body manufacturing method |
| JP6544231B2 (en) * | 2015-12-25 | 2019-07-17 | 三菱電機株式会社 | Welding method and manufacturing method of can |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5284550A (en) * | 1975-12-30 | 1977-07-14 | Nisshin Steel Co Ltd | Drum of ferrite stainless steel for hottwater heater |
| JPH0244627B2 (en) * | 1986-06-16 | 1990-10-04 | Seiwa Kogyosho Kk | DENKIONSUIKITONOKANTAINOSEIZOHOHO |
| JPH026056A (en) * | 1988-03-18 | 1990-01-10 | Zojirushi Corp | Metallic bottomed container and welding method thereto |
-
1990
- 1990-04-27 JP JP2114187A patent/JP2593233B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029494A (en) * | 2010-12-31 | 2011-04-27 | 杭州余杭獐山钢瓶有限公司 | Comprehensive steel cylinder welding machine |
| JP2012148304A (en) * | 2011-01-19 | 2012-08-09 | Mitsubishi Electric Corp | Method for welding thin plate member and method for manufacturing can body using the method |
| WO2019026568A1 (en) | 2017-07-31 | 2019-02-07 | ダイキン工業株式会社 | Tank manufacturing method, mirror plate of tank, and tank |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH049276A (en) | 1992-01-14 |
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