JPS6313671A - Overhead one-side welding method - Google Patents
Overhead one-side welding methodInfo
- Publication number
- JPS6313671A JPS6313671A JP15854786A JP15854786A JPS6313671A JP S6313671 A JPS6313671 A JP S6313671A JP 15854786 A JP15854786 A JP 15854786A JP 15854786 A JP15854786 A JP 15854786A JP S6313671 A JPS6313671 A JP S6313671A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- wire
- flux
- range
- bead
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims description 12
- 230000004907 flux Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000011324 bead Substances 0.000 abstract description 32
- 238000009941 weaving Methods 0.000 abstract description 12
- 239000010953 base metal Substances 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 17
- 239000007787 solid Substances 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- -1 5i02 Chemical compound 0.000 description 1
- 235000016068 Berberis vulgaris Nutrition 0.000 description 1
- 241000335053 Beta vulgaris Species 0.000 description 1
- 101100282111 Caenorhabditis elegans gap-2 gene Proteins 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910001632 barium fluoride Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はフラックス太りワイヤを使用する上向片面溶接
方法に関し、詳細には開先変動が犬ぎくても安定した裏
波ビードを形成することができる上向片面溶接方法に関
するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an upward single-sided welding method using a thickened flux wire, and more specifically, to forming a stable Uranami bead even if the groove fluctuates sharply. The present invention relates to an upward single-sided welding method that allows for upward single-sided welding.
［従来の技術］
造船における船底の溶接や橋梁における大ブロックの建
造等に当たっては、上向姿勢で行なわなければならない
溶接箇所にしばしば遭遇する。[Prior Art] When welding the bottom of a ship in shipbuilding or constructing a large block for a bridge, welding points that must be performed in an upward position are often encountered.
ところか上向姿勢の溶接では溶接金属の溶は落ちが発生
し易く溶接の中断を余儀なくされることが多い。従って
溶接欠陥を生じる危険があり、溶接箇所の裏面側から下
向姿勢で溶接（補修溶接を含む）を実施することになる
ので挟隘部に入りこんでの溶接作業となり、余分な工程
や工数が増えてしまう。However, when welding in an upward position, the weld metal tends to drip, often forcing welding to be interrupted. Therefore, there is a risk of welding defects occurring, and since welding (including repair welding) must be performed from the back side of the welded area in a downward position, welding work must be performed by entering the narrow area, which requires extra steps and man-hours. It will increase.
そこで上向片面溶接においても良好な溶接継手を得るこ
とのできる方法について色々の工夫及び提案がなされて
はいるものの、実用面において完壁と考えられるものは
未だ知られていない。Therefore, although various ideas and proposals have been made regarding methods for obtaining a good welded joint even in upward single-sided welding, there is still no known method that can be considered perfect in practical terms.
その原因の１つとしては母材の開先形状が一定でないこ
とを挙げることができる。即ち母材間のギャップか小さ
過ぎると裏波ビードが形成されず、反対にギャップが大
き過ぎると裏波ビートにへこみが生したり或は表ビート
に凸部が生し、次層での融合不良を引ぎ起こしたり又は
溶は落ち等の不都合を引き起こすので、開先ルート幅は
溶接線全長に亘って可及的均等なものにしなければなら
ない。そこで例えは特開昭４８−５６５４３号では、開
先幅の変動を打消し得る様な幅に調整された薄鋼板をギ
ャップ内に挿入りるという試みがなされているが、この
様な条イ？１を満足する薄鋼板を形成することは実用」
二はとノＶと不可能である。One of the reasons for this is that the groove shape of the base material is not constant. In other words, if the gap between the base materials is too small, the uranami bead will not be formed, and on the other hand, if the gap is too large, the uranami bead will be dented or a convex portion will be formed on the front bead, which will prevent fusion in the next layer. The groove root width must be made as uniform as possible over the entire length of the weld line to avoid problems such as failure or melt drop. For example, in Japanese Patent Application Laid-open No. 48-56543, an attempt was made to insert a thin steel plate into the gap whose width was adjusted to cancel out the variation in the groove width. ? It is practical to form a thin steel plate that satisfies 1.
The second one is impossible.
［発明が解決しようとする問題点］
また立向姿勢や」二面姿勢の溶接では、表ビードの凸形
化を防止する溶接方法とし゛Ｃソリッドワイヤを用いた
短絡移行（ショートアーク）溶接が採用されることがあ
る。短絡移行ではアーク電圧を低くして溶融金属を接触
させることにより安定径行させるのであるが、ソリッド
ワイヤを使用する場合の実質的なアーク電圧は１６〜２
３Ｖ程度の比較的狭い範囲であり、この範囲を外れると
アークが不安定となっ゛Ｃ安定溶接の連続実施が困難と
なる。[Problems to be Solved by the Invention] In addition, for welding in a vertical position or a two-sided position, short-circuit transition (short arc) welding using a C solid wire is adopted as a welding method to prevent the surface bead from becoming convex. may be done. In short-circuit transition, the arc voltage is lowered to bring the molten metal into contact and stabilize the trajectory, but when using a solid wire, the actual arc voltage is 16 to 2.
This is a relatively narrow range of about 3V, and outside this range the arc becomes unstable and it becomes difficult to perform continuous stable welding.
また短絡回数は約７０〜１３０回と比較的多く、短絡回
数が少なくなると表ビードか凸形となったり溶は落ちを
発生する。このようにソリッドワイヤを用いた短絡移行
での溶接条件幅は非常に狭い。さらに上向姿勢の片面溶
接においても母材の許容ギャップ範囲が狭い（実質上４
±１ ｍｍ）という限定が緩和される訳ではない。従っ
てソリッドワイヤを用いて短絡移行を行なう上記改良方
法であっても母材間のギャップが一定しない上向溶接に
は不向きであり、実用性に乏しいものであった。Further, the number of short circuits is relatively high, about 70 to 130 times, and when the number of short circuits decreases, the surface bead becomes convex or melt drop occurs. As described above, the range of welding conditions for short-circuit transition using solid wire is extremely narrow. Furthermore, even in single-sided welding in an upward position, the allowable gap range for the base metal is narrow (practically 4
±1 mm) is not relaxed. Therefore, even the above-mentioned improved method of performing short-circuit transition using a solid wire is unsuitable for upward welding where the gap between the base materials is not constant, and has poor practicality.
そこで本発明者はギャップ変動を伴なう開先であっても
上向姿勢で安定して連続ｍ接を行なうことのできる方法
を提供すべく種々研究を積み重ねた結果、本発明を完成
させるに至った。Therefore, the present inventor has conducted various researches to provide a method that can perform continuous m-welding stably in an upward position even on a groove with gap fluctuation, and as a result, he has completed the present invention. It's arrived.
［問題点を解決するための手段］
上記目的を達成し得た本発明方法は、５０重量％以上が
造滓剤であるフラックスをワイヤ全重量に対して１０〜
３０％含有させたフラックス入りワイヤを用い、該ワイ
ヤの後退角度を２０〜５０度の範囲に設定しつつ、短絡
回数を１５〜５０回／秒の範囲で上向溶接する点を要旨
とするものである。[Means for Solving the Problems] The method of the present invention, which has achieved the above object, uses flux of which 50% by weight or more is a slag-forming agent in an amount of 10% to 10% by weight based on the total weight of the wire.
The gist is to use a flux-cored wire containing 30%, set the receding angle of the wire in the range of 20 to 50 degrees, and perform upward welding at a short circuit frequency of 15 to 50 times/second. It is.
［作用］
本発明はフラックス入りワイヤを用いて上向溶接する方
法であり、ワイヤ重量に対するフラックスの充填割合は
１０〜３０％（重量％の意味、以下同じ）の範囲とする
。即ちフラックスが１０％未満であるとソリッドワイヤ
の溶接特性と類似した性質を呈し、前項で述べた様な不
具合点が解消されず、逆に３０％を超えるとワーＣヤの
強度不足による送給不良が発生し、アーク不安定となっ
て表ビード形状も不良となる。[Function] The present invention is a method of upward welding using a flux-cored wire, and the filling ratio of flux to the weight of the wire is in the range of 10 to 30% (the meaning of % by weight, the same applies hereinafter). In other words, if the flux is less than 10%, the welding characteristics will be similar to that of solid wire, and the problems mentioned in the previous section will not be resolved, while if it exceeds 30%, the wire will not be fed due to insufficient strength. A defect occurs, the arc becomes unstable, and the surface bead shape also becomes defective.
またフラックス中の造滓剤はフラックス全体の５０％以
上とし、スラグによる表ビードの保持効果を安定的に発
揮せしめる。本発明で用いられる造滓剤は、スラグ形成
を主目的とするものの他、結果的にスラグとして残留す
るものを含み、例えばＴｉＯ２、ＺｒＯ２，５ｉ０２
、Ａ１２０３ 。In addition, the slag forming agent in the flux should be at least 50% of the total flux to ensure that the slag retains the surface beads stably. Slag-forming agents used in the present invention include those whose main purpose is to form slag, as well as those that remain as slag, such as TiO2, ZrO2, 5i02
, A1203.
Ｋ２Ｏ，Ｎａ２０等が挙げられる。K2O, Na20, etc. are mentioned.
なお以下に記載するフラックス入りワイヤとは上記範囲
のものとする。Note that the flux-cored wire described below is within the above range.
第１図は水平母材１を上向溶接する場合の説明図である
。このとぎ溶接進行方向（矢印Ｂ）に対する垂直線Ｈと
溶接用ワイヤ４のなす後退角度Ａ１は２０〜５０度の範
囲に設定する必要があり、後退角度Ａ１が２０度未満の
場合にはアーク切れが発生し易く、逆に５０度を超える
とアーク状態の監視及びアーク狙いの位置調整が困難と
なって溶接作業に支障をきたし、溶接が不安定となる。FIG. 1 is an explanatory diagram of upward welding of the horizontal base material 1. The receding angle A1 formed by the welding wire 4 and the perpendicular line H to the direction of welding progress (arrow B) must be set in the range of 20 to 50 degrees, and if the receding angle A1 is less than 20 degrees, the arc will break. On the other hand, if the angle exceeds 50 degrees, it becomes difficult to monitor the arc condition and adjust the arc aiming position, which hinders welding work and makes welding unstable.
尚図中の符号２は溶接金属、３ａ、３ｂはスラグ、５は
溶接トーチ、６はライ−バー、７は裏当材を夫々示す。In the figure, reference numeral 2 represents weld metal, 3a and 3b represent slag, 5 represents a welding torch, 6 represents a liver, and 7 represents a backing material.
フラックス入りワイヤは通常フリーフライト（粒状移行
や噴霧状移行）状態で使用されることが多いが、アーク
電圧を下げることによって短絡移行となり本発明はこの
短絡移行を積極的に利用するものである。いまアーク電
流一定の条件下でアーク電圧を下げると短絡回数は増加
するが、短絡回数か５０回／秒Ｊ：り多くなると入熱が
不足して母材の溶込みが不−１−分となり安定した溶接
はできない。逆に短絡回数か１５回／秒より少ないと入
熱量が多く １１９過ぎて裏ビー１−か凹状となり、極
端な場合には熔り落ちを牛しる。Flux-cored wire is usually used in a free flight state (granular transfer or atomized transfer), but by lowering the arc voltage, short circuit transfer occurs, and the present invention actively utilizes this short circuit transfer. Now, if the arc voltage is lowered under the condition that the arc current is constant, the number of short circuits will increase, but if the number of short circuits increases to 50 times/sec, the heat input will be insufficient and penetration into the base metal will be insufficient. Stable welding is not possible. On the other hand, if the number of short circuits is less than 15 times/second, the amount of heat input will be large.
溶接用ワイヤのウィービングは１υ月間のギャップの大
ぎさに応じ゛〔第４図（ａ）に示す様に開先左右方向に
振幅さｌ′Ｃ行なうか、図示した梯な直線的ウィービン
グでは溶融金属の溶は落ちが生じ易くなり表ビードが凸
状に、また裏ビードが凹状となる。そこで本発明の好ま
しい実施態様では第４図（ｂ）、（ｃ）に示す様に開先
左右方向及び母材板厚方向を含む２次元面内でウィービ
ングさせることとし、その結果溶融金属の濡れ性が良好
となって溶融金属の溶は落ちか少なくなり、ビート外観
も良好となる。The weaving of the welding wire depends on the size of the gap for 1υ months. Melting tends to occur and the front bead becomes convex and the back bead becomes concave. Therefore, in a preferred embodiment of the present invention, weaving is carried out in a two-dimensional plane including the left-right direction of the groove and the thickness direction of the base material, as shown in FIGS. 4(b) and 4(c). The properties of the molten metal are improved, the melting of the molten metal is reduced, and the appearance of the beets is also improved.
［実施例］
第１表は母イ４５Ｍ４ｔｎ（厚さ＋６ｍｍ）をフラック
ス充填割合の異なるワイヤによって上向溶接した場合の
溶接結果を示す。尚溶接条件は下記する通りである。[Example] Table 1 shows the welding results when 45M4tn (thickness +6 mm) was welded upward using wires with different flux filling ratios. The welding conditions are as follows.
溶接条件
電流 ：１４０〜１６０Ａ
電圧 ；１７〜１９Ｖ
速度 ：６〜９ ｃｖｎ１分
開先形状：ギャップ６ｍｍ、５０” Ｖ字型開先シール
ドガス：Ａｒ−２０％ＣＯ２
ワイヤ：ＹＣＷ−２
裏当材：ＫＬ−３
ウィービング条件
振幅Ｗ：５〜８ｍｌ１１
振幅Ｄ：２ｍｍ
フラックス組成：造滓剤６０％、鉄粉１０％、脱酸剤３
０％
この結果フラックスの充填割合が１０〜３０％の範囲内
であれば表ビード形状及び裏ビード形状は良好な溶接部
が得られることが分かる。Welding conditions Current: 140-160A Voltage: 17-19V Speed: 6-9 cvn 1 minute Bevel shape: Gap 6mm, 50" V-shaped groove Shielding gas: Ar-20%CO2 Wire: YCW-2 Backing material: KL -3 Weaving condition amplitude W: 5 to 8 ml11 Amplitude D: 2 mm Flux composition: slag forming agent 60%, iron powder 10%, deoxidizer 3
0% The results show that if the flux filling ratio is within the range of 10 to 30%, a welded part with good front bead shape and back bead shape can be obtained.
また第２表は上記と同様の溶接条件下に４６いてフラッ
クス充填割合を２０％として、該フラックス中の造滓剤
の割合を変化させた場合の上向溶接結果を示す。尚フラ
ックス中の造滓剤以外の組成は脱酸剤を２０％とし、残
部を鉄粉とした。Further, Table 2 shows the results of upward welding under the same welding conditions as above when the flux filling ratio was 20% and the ratio of the slag forming agent in the flux was varied. The composition of the flux other than the slag forming agent was 20% deoxidizing agent and the remainder was iron powder.
この結果フラックス中の造滓剤の割合が５０％以上であ
れは表ビート゛のスラグＬＪ均一にイ」着され、裏ビー
ドの形状も良好とすることかできる。As a result, if the proportion of the slag forming agent in the flux is 50% or more, the slag LJ of the front bead is uniformly deposited, and the shape of the back bead can be made good.
第３図は基礎実験結果を示すグラフで、ソリッドワイヤ
（０印及び◇印）及びフラックス入りワイヤ（○印と△
印）を用いてＩｌｌ材５Ｍ４１Ｂ（厚さ１２＋ｎｍ）上
に短絡移行状態で下向溶接したときの短絡回数とアーク
電圧の関係を示す。尚溶接ワイヤは１．２ｍｍφのもの
を使用し、ワイヤ角度は母材に対して直角とし、シール
ドガスとしてＣ０２を用いた。溶接電流は夫々１５０Ａ
（０印）。Figure 3 is a graph showing the results of basic experiments, including solid wire (marked 0 and ◇) and flux-cored wire (marked ○ and △).
The relationship between the number of short circuits and the arc voltage when downward welding is performed on Ill material 5M41B (thickness 12+nm) in a state of short circuit transition using the graph (mark) is shown. The welding wire used was 1.2 mm in diameter, the wire angle was set at right angles to the base metal, and C02 was used as the shielding gas. Welding current is 150A each
(0 mark).
１３０Ａ（◇印）、１６０Ａ（○印）、１４０Ａ（△印
）とした。その結果ソリッドワイヤを用いた場合には、
アーク電圧がおおよそ２３Ｖ以上となるとアークがふら
つく状態となり安定した溶接かできず、また約１６Ｖ以
下となるとワイヤを溶融させる熱量が不足してアーク切
れを生じることがあった。They were 130A (◇), 160A (○), and 140A (△). As a result, when using solid wire,
When the arc voltage exceeds about 23 V, the arc becomes unstable and stable welding cannot be performed, and when the arc voltage falls below about 16 V, there is insufficient heat to melt the wire, resulting in arc breakage.
一方フラックス入りワイヤを用いた場合には、上記電流
範囲では高電圧状態でフリーフライトとなって大粒のス
パッタを発生し作業性を悪化させたが、電圧を下げるこ
とによって安定した短絡移行が行なえる様になり、短絡
回数１５〜５０回／秒において良好な溶接部を得ること
ができた。On the other hand, when flux-cored wire was used, in the above current range, free flight occurred under high voltage conditions, generating large spatter particles and worsening workability, but by lowering the voltage, stable short-circuit transition could be performed. Thus, a good welded joint could be obtained when the number of short circuits was 15 to 50 times/sec.
第２図は片面上向溶接における短絡回数と許容ギャップ
範囲の関係を示すグラフであり、ソリッドワイヤにおけ
る適正な短絡回数は６０〜１３０回／秒程度と比較的許
容度が広いが母材間の許容ギャップ範囲は４±１ｍｍ程
度と非常に狭い。これに対しフラックス入りワイヤでは
短絡回数の許容範囲は１５〜５０回／秒と狭くなるが逆
に許容ギャップ範囲は３〜１２ｍｍと広くなり、大きな
ギャップ変動に対しても適応性が良くなることが分かる
。尚ギャップが３ｍｍ以下では裏ビードが出なかったり
、出ても凹状を呈し、さらに１ｆｆｌＩＩ＋以下では融
合不良を発生し、逆にギャップが１２ｍｍを超えると入
熱増加に対してスラグによるビード保持効果が期待でき
なくなって表ビードが凸状を呈し、ギャップかさらに広
がると溶は落ちを発生する。Figure 2 is a graph showing the relationship between the number of short circuits and the allowable gap range in single-sided upward welding. The allowable gap range is very narrow, about 4±1 mm. On the other hand, with flux-cored wire, the allowable range of the number of short circuits is narrower at 15 to 50 times/sec, but the allowable gap range is wider at 3 to 12 mm, making it more adaptable to large gap fluctuations. I understand. If the gap is less than 3 mm, the back bead will not come out, or if it does come out, it will have a concave shape, and if it is less than 1fflII+, poor fusion will occur, and if the gap exceeds 12 mm, the slag will have a bead retention effect against the increase in heat input. If expectations are lost and the surface bead becomes convex, and the gap widens further, the melt will drop.
本発明の好ましいウィービングパターンは第４図（ｂ）
、（ｃ）に例示した通りであるが、溶接トーチ５に第１
図の様１２後退角度Ａ、が与えられているので、ワイヤ
の移動方向を側面から見ると第１図に示す様になり（但
し溶接台車の矢印Ｂ方向への進行を停止させた状態で考
えている）、同図に示す様な傾ぎ角度Ａ、（９０−Ａ、
）が与えられる。この傾ぎ角度Ａ２がクレータの傾き角
度Ａ３と同等の場合にはウィービング中のワイヤ突出し
長さの変動が少ない為安定した溶接が可能であり、実用
上はこの傾き角度Ａ２を１０〜６０度とすることが９丁
ましし）。A preferred weaving pattern of the present invention is shown in FIG. 4(b).
, as illustrated in (c), the welding torch 5 has the first
Since the receding angle A is given as shown in the figure, the moving direction of the wire is as shown in Fig. 1 when viewed from the side (however, the welding cart is considered with the welding cart stopped moving in the direction of arrow B). ), the inclination angle A as shown in the figure, (90-A,
) is given. When this inclination angle A2 is equivalent to the inclination angle A3 of the crater, stable welding is possible because there is little variation in the wire protrusion length during weaving, and in practical terms, this inclination angle A2 is set to 10 to 60 degrees. (It's better to do that than nine.)
またウィービングの開先左右方向の振幅Ｗ［第４図（ｂ
）］は、ｍ材ギャップ＋４ｍｍから母材ギャップ間−２
１川の範囲であることが好ましく、振幅Ｗが小さ過ぎる
と溶接金属がギャップ間にブリッジされないので１υ第
４表面への溶は込みが不十分となって溶接不可能となり
、また逆に犬ぎ過ぎるとアークの不安定を招く。Also, the amplitude W in the left and right direction of the weaving groove [Fig. 4(b)
)] is from m material gap +4mm to base material gap -2
It is preferable that the amplitude W be within the range of 1 υ. If the amplitude W is too small, the weld metal will not be bridged between the gaps, resulting in insufficient penetration of the weld into the 1υ fourth surface, making it impossible to weld; Too much will cause instability of the arc.
第５図はウィービングの板厚方向振幅りとビート形状と
の関係を示すグラフである。母材として５Ｍ４ｔＢ、Ｉ
接ワイヤとして前記成分のフラックス入りワイヤＹＣＷ
−２４、裏当材として固形フラックスタイプのＫＬ−３
、シールドガスとしてＣＯ２を夫々用い、後退角度４０
度で上向溶接を行なった。尚開先はギャップ６ｍｍで５
０°のＶ字形開先とした。図中のＯ印は裏ビード余盛高
さを示し、Δ印は表ビート中央部高さを示す。FIG. 5 is a graph showing the relationship between the amplitude of weaving in the thickness direction and the beat shape. 5M4tB, I as base material
Flux-cored wire YCW of the above components as a contact wire
-24, solid flux type KL-3 as backing material
, CO2 is used as the shielding gas, and the receding angle is 40.
Upward welding was performed at 300 degrees. The bevel is 5 with a gap of 6 mm.
A V-shaped groove of 0° was formed. The O mark in the figure indicates the back bead extra height, and the Δ mark indicates the front bead center height.
この結果振幅りがＯｍｎ＋では、電流、電圧を下げて入
熱を減らしたり、或はウィービングの両端でワイヤの移
動を止めてビードのなじみを向上させても表ビードの凸
状化を防ぐことはできず、逆に振幅りを６ｍｍより大き
くすると溶接初層ののど厚以上の運棒となってアークが
不安定になり、裏ビートが凹状化する。従って振幅りの
適正な範囲は０．５〜Ｂ＋ｎ＋＋＋内に設定されること
が好ましい。As a result, if the amplitude is Omn+, it is impossible to prevent the surface bead from becoming convex even if you lower the current and voltage to reduce heat input, or stop the wire movement at both ends of the weaving to improve bead conformity. On the other hand, if the amplitude is made larger than 6 mm, the arc becomes unstable due to the throat thickness of the initial welding layer, and the back beat becomes concave. Therefore, it is preferable that the appropriate range of amplitude is set within 0.5 to B+n+++.
短絡回数を１５〜５０回／秒とするための定電圧特性の
電源としては、サイリスタを用いるものよりはトランジ
スタを用いるもののほうが良い。As a power supply with constant voltage characteristics for making the number of short circuits 15 to 50 times/second, it is better to use a transistor than a thyristor.
これは、サイリスタ型では短絡時とアーク発生時の平均
電圧しか調整できないのに対し、トランジスタ型ではア
ーク発生時の電圧調整も可能であり、短絡回数を増加す
ることが可能だからである。This is because the thyristor type can only adjust the average voltage when a short circuit and an arc occurs, whereas the transistor type can also adjust the voltage when an arc occurs, making it possible to increase the number of short circuits.
裏当材につい゛〔は格別の制限はないが、通常使用され
る炭酸ガス溶接用裏当材かもっとも好都合であり、また
材料面に４６いてもセラミックタイプ及びフラックスを
成形したタイプのいずれのを適用してもよく、上向溶接
用として特殊なものを準備する必要はない。There are no particular restrictions on the backing material, but it is most convenient to use the normally used backing material for carbon dioxide gas welding. It is not necessary to prepare anything special for upward welding.
さらにシールドガスについても制限は無いが、例えばＣ
０２やＡｒ−ＣＯ２を用いる場合にはフラックスに含有
させる造滓月としてＴｉＯ２を５０％以上充填したもの
を使用したときに最適の溶接作業性を得ることができる
。Furthermore, there are no restrictions on shielding gas, but for example, C
When using 02 or Ar-CO2, optimum welding workability can be obtained when the flux is filled with 50% or more of TiO2 as the slag.
第３表は溶接条（’Ｉを種々変更して上向溶接したとぎ
の裏・表ビード形状を観察した結果を示す。Table 3 shows the results of observing the back and front bead shapes of welding strips ('I) that were upwardly welded with various changes.
実験番号ｌ〜１６では、１０材として５Ｍ５０Ａ（厚さ
１６ｍｍ）、 シールドガスとしてＡｒ−２０％ＣＯ２
，裏当材としてＫＬ−３，ソリッドワイヤとしてＹＣＷ
−２，フラックス人すワイヤとしてＹＦＷ−３４を夫々
用い、５０°■字型間先の母材に後退角度３０〜４０度
で上向溶接を実施した。また実験番号１７〜２２は母材
やワイヤ等を変更して上向溶接した場合の例を示す。In experiment numbers 1 to 16, 5M50A (thickness 16 mm) was used as the 10th material, and Ar-20% CO2 was used as the shielding gas.
, KL-3 as backing material, YCW as solid wire
-2. YFW-34 was used as the flux wire, and upward welding was performed on the base metal at the end of the 50° ■ shape at a receding angle of 30 to 40 degrees. Moreover, experiment numbers 17 to 22 show examples in which upward welding was performed by changing the base material, wire, etc.
実験番号１〜５はソリッドワイヤを用いた従来例であり
、短絡回数が７０〜１３０回／秒の範囲内でなりれは良
好なビード形状を得ることはできず、ギャップは４ｍｍ
程度でなければ良好なビート形状は得られない。Experiments Nos. 1 to 5 are conventional examples using solid wire, and if the number of short circuits is within the range of 70 to 130 times/second, it is not possible to obtain a good bead shape, and the gap is 4 mm.
A good bead shape cannot be obtained unless it is of a certain degree.
実験番号６〜８は本発明に対する比較例であり、ギャッ
プが狭ずぎる場合（実験番号６）には裏ビードが凹状に
なり、また短絡回数が少ない場合（実験番号７）にはア
ークが安定せずに裏ビートが凹状になり、短絡回数が多
い場合（実験番号Ｂ）には入熱不足となって融合不良が
発生した。Experiment numbers 6 to 8 are comparative examples for the present invention; when the gap is too narrow (experiment number 6), the back bead becomes concave, and when the number of short circuits is small (experiment number 7), the arc becomes stable. In the case where the back beat became concave and the number of short circuits was large (experiment number B), heat input was insufficient and fusion failure occurred.
実験番号９〜１４は本発明実施例であり、良好なビート
形状及び溶接作業性能を示した。Experiment numbers 9 to 14 are examples of the present invention, and showed good beat shapes and welding work performance.
実験番号１５．１６はウィービング条件を変更した比較
例であり、振幅Ｄ（母材板厚方向の振幅）が高すぎる場
合（実験番号１５）にはアークが不安定となってビード
形状は悪く、逆に振幅りかＯの場合（実験番号１６）に
は振幅Ｗの両端で停止時間を設定しても表ビードが凸状
を呈した。Experiment numbers 15 and 16 are comparative examples in which the weaving conditions were changed; when the amplitude D (amplitude in the thickness direction of the base material) is too high (experiment number 15), the arc becomes unstable and the bead shape is poor; Conversely, when the amplitude was O (experiment number 16), the top bead had a convex shape even if the stop time was set at both ends of the amplitude W.
実験番号１７は母材を６０ ＨＴに変更し、フラックス
入りワイＡ！も６０ ＨＴ川に変更した例を示し、実験
番Ｊ＋１８．１９は開先角度を変更した例を示すが、い
ずれも良好なビード形状が得られた。また実験番号２０
はシールドガスをＣＯ３に変えた例を示し、実験番号２
１は裏当材をＦＢＢ−３に変更した例を示し、これらの
例でも良好なビード形状が得られた。In experiment number 17, the base material was changed to 60 HT, and flux-cored YA! Experiment No. J+18.19 shows an example in which the groove angle was changed, and a good bead shape was obtained in both cases. Also experiment number 20
shows an example in which the shielding gas was changed to CO3, experiment number 2
No. 1 shows examples in which the backing material was changed to FBB-3, and good bead shapes were obtained in these examples as well.
実験番号２２はフラックス中の造滓剤をＢａＦ２．Ｌｉ
Ｆ等の弗化物主体のものに変え、ガスシールドを行なわ
ないで１．８ ｍ１ｌｌφのセルフシールドアーク溶接
用ワイヤを便用した例であるが、この場合でも良々ｆな
ビート形状を得ることができた。In experiment number 22, the slag forming agent in the flux was BaF2. Li
This is an example in which a 1.8 ml φ self-shielded arc welding wire was used instead of a fluoride-based wire such as F, without gas shielding, but even in this case, a good f-shaped bead shape could be obtained. Ta.
［発明の効果］
本発明によりギャップ変動の大台い１υ材であっても安
定して連続的な上向溶接ができる様になり、上向片面溶
接の自動化が推進され、船底ブロックの継手や橋梁等の
大ブロックの継手においても良好な溶接作業性を発揮さ
せることが可能になった。[Effects of the invention] The present invention makes it possible to stably and continuously perform upward welding even for 1υ materials with large gap fluctuations, promoting automation of upward single-sided welding, and improving joints of bottom blocks and It has become possible to demonstrate good welding workability even in joints of large blocks such as bridges.
第１図は上向溶接の例を示す説明図、第２図は短絡回数
と許容ギャップの関係を示すグラフ、第３図はアーク電
圧と短絡回数との関係を示すグラフ、第４図（ａ）〜（
ｃ）はウィービングの移動軌跡を示す説明図、第５図は
板厚方向の振幅とビード形状の関係を示すグラフである
。Fig. 1 is an explanatory diagram showing an example of upward welding, Fig. 2 is a graph showing the relationship between the number of short circuits and the allowable gap, Fig. 3 is a graph showing the relationship between the arc voltage and the number of short circuits, and Fig. 4 (a )～(
c) is an explanatory diagram showing the weaving locus, and FIG. 5 is a graph showing the relationship between the amplitude in the plate thickness direction and the bead shape.
Claims (2)
ヤ全重量に対して１０〜３０％含有させたフラックス入
りワイヤを用い、該ワイヤの後退角度を２０〜５０度の
範囲に設定しつつ、短絡回数を１５〜５０回／秒の範囲
で上向溶接することを特徴とする上向片面溶接方法。(1) Using a flux-cored wire containing 10 to 30% of the total weight of the wire, 50% by weight or more of flux is a slag forming agent, and setting the receding angle of the wire in the range of 20 to 50 degrees. . An upward single-sided welding method, characterized in that upward welding is performed at a short circuit frequency in the range of 15 to 50 times/second.
厚方向を含む２次元平面内でウィービングして溶接する
特許請求の範囲第１項に記載の上向片面溶接方法。(2) The upward single-sided welding method according to claim 1, in which the flux-cored wire is weaved and welded within a two-dimensional plane including the left-right direction of the groove and the thickness direction of the base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15854786A JPS6313671A (en) | 1986-07-04 | 1986-07-04 | Overhead one-side welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15854786A JPS6313671A (en) | 1986-07-04 | 1986-07-04 | Overhead one-side welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6313671A true JPS6313671A (en) | 1988-01-20 |
| JPH055582B2 JPH055582B2 (en) | 1993-01-22 |
Family
ID=15674091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15854786A Granted JPS6313671A (en) | 1986-07-04 | 1986-07-04 | Overhead one-side welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6313671A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074169U (en) * | 1993-06-16 | 1995-01-20 | ▲吉▼久 新居 | Car rear view device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5286939A (en) * | 1976-01-16 | 1977-07-20 | Kobe Steel Ltd | Overhead position gas shielded one side welding process |
| JPS606275A (en) * | 1983-06-24 | 1985-01-12 | Hitachi Zosen Corp | Automatic overhead welding method |
-
1986
- 1986-07-04 JP JP15854786A patent/JPS6313671A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5286939A (en) * | 1976-01-16 | 1977-07-20 | Kobe Steel Ltd | Overhead position gas shielded one side welding process |
| JPS606275A (en) * | 1983-06-24 | 1985-01-12 | Hitachi Zosen Corp | Automatic overhead welding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH055582B2 (en) | 1993-01-22 |
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