JP2010201456A - Method of gas shielded arc metal welding of fillet with one flat side - Google Patents

Method of gas shielded arc metal welding of fillet with one flat side Download PDF

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JP2010201456A
JP2010201456A JP2009048942A JP2009048942A JP2010201456A JP 2010201456 A JP2010201456 A JP 2010201456A JP 2009048942 A JP2009048942 A JP 2009048942A JP 2009048942 A JP2009048942 A JP 2009048942A JP 2010201456 A JP2010201456 A JP 2010201456A
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pulse
welding
fillet
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peak current
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JP5103424B2 (en
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Isamu Kimoto
勇 木本
Daisuke Omura
大輔 大村
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Nippon Steel & Sumikin Welding Co Ltd
日鐵住金溶接工業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method with few spatter generation in which deep weld penetration is achieved even in a part with a tack welded bead, in a method of gas shielded arc metal welding of a fillet with one flat side for welding a flat fillet with a fillet angle of >90° having an inclined standing plate of a member for welding of the flat fillet including a base plate and the standing plate. <P>SOLUTION: The welding is performed by using a solid wire with wire feed speed: 15-17 m/min, and adding a pulse with pulse peak current (Ip) : 480-600 A, pulse base current (Ib) : 30-80 A, pulse frequency: 200-300 Hz, and the pulse peak current (Ip) and a pulse peak time (Tp) satisfy formula (1): 480≤Ip[A]×Tp[msec]≤900. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、橋梁における構造物のうち特にUトラフ形リブの片側水平すみ肉ガスシールドアーク溶接方法に係り、仮付け溶接ビードが有る箇所においても深い溶け込みが得られ、スパッタ発生量の少ない片側水平すみ肉ガスシールドアーク溶接方法に関する。   The present invention relates to a one-side horizontal fillet gas shielded arc welding method, particularly a U trough-shaped rib among structures in a bridge. The present invention relates to a fillet gas shielded arc welding method.
橋梁の分野において鋼床版の補強材として図4(a)に示すような閉断面形式のUトラフ形リブ1(以下、Uリブという。)が、図4(b)に示す開断面形式の縦リブ7に比べてその使用量が増加している。これはUリブが縦リブに比べて強度および防錆上好ましく、鋼床版全体の軽量化や溶接長の低減が図れるなどのメリットがあることによる。   In the field of bridges, U trough-shaped ribs 1 (hereinafter referred to as U-ribs) having a closed cross section as shown in FIG. Compared with the longitudinal rib 7, the amount of use is increasing. This is because the U rib is preferable in terms of strength and rust prevention compared to the vertical rib, and has advantages such as reduction in the weight of the entire steel deck and reduction in the weld length.
しかし、図4(b)に示すような縦リブの溶接においては縦リブ7の両側から水平すみ肉溶接が可能なため溶け込み量が確保できるが、図4(a)に示すようなUリブ1の場合片側のみからの水平すみ肉溶接になるので溶け込み量の確保が容易ではない。さらに、Uリブを鋼床版に溶接する場合、取り付け精度を得るために本溶接の前にすみ肉部に仮付け溶接するが、この仮付け溶接部の水平すみ肉溶接においては溶け込み量を確保するのが困難である。   However, in the welding of vertical ribs as shown in FIG. 4B, horizontal fillet welding can be performed from both sides of the vertical ribs 7, so that the amount of penetration can be ensured. However, the U-rib 1 as shown in FIG. In this case, since the horizontal fillet welding is performed from only one side, it is not easy to secure the amount of penetration. Furthermore, when welding U-ribs to steel slabs, they are temporarily welded to the fillet before the main welding in order to obtain mounting accuracy, but the amount of penetration is ensured in horizontal fillet welding of this temporary weld. Difficult to do.
一般に、Uリブの片側水平すみ肉溶接はソリッドワイヤを用いたガスシールドアーク溶接が、溶接の自動化が容易で高能率であり、機械的性能の良好な溶接金属部と良好なビード形状が得られることから広く適用されている。しかしながら、前述のように仮付け溶接部では安定した溶け込み確保が難しく、また適正な溶接ができる溶接条件が非常に狭い範囲となる。   In general, U-rib horizontal fillet welding on one side is a gas shielded arc welding using solid wire, which is easy to automate and highly efficient, and provides a weld metal part with good mechanical performance and a good bead shape. It is widely applied. However, as described above, it is difficult to secure stable penetration in the tack welded portion, and the welding conditions under which proper welding can be performed are in a very narrow range.
また、Uリブと鋼床版の水平すみ肉溶接継手部には品質特性面からスパッタの発生量を軽減して部材への付着を少なくすることも要求される。しかしソリッドワイヤを用いて深い溶け込みを得るために高電流の溶接条件で水平すみ肉溶接すると、スパッタ発生量が非常に多くなるという問題もある。   Further, the horizontal fillet welded joint between the U rib and the steel slab is also required to reduce the amount of spatter generated and reduce the adhesion to the member from the viewpoint of quality characteristics. However, in order to obtain deep penetration using a solid wire, there is a problem that the amount of spatter is greatly increased when horizontal fillet welding is performed under high current welding conditions.
スパッタ発生量が少なくビード外観が良好な片側水平すみ肉溶接部を得るために、フラックス入りワイヤを用いた技術が特開平8−281476号公報(特許文献1)にある。しかし、フラックス入りワイヤはソリッドワイヤに比べて溶け込み深さが浅く、仮付け溶接部においては溶け込み量を確保するのが困難である。また、スラグを除去する作業も必要となる。   Japanese Patent Laid-Open No. 8-281476 (Patent Document 1) discloses a technique using a flux-cored wire in order to obtain a one-side horizontal fillet weld with a small amount of spatter and a good bead appearance. However, the flux-cored wire has a smaller penetration depth than the solid wire, and it is difficult to secure the penetration amount in the tack welded portion. Moreover, the operation | work which removes slag is also needed.
一方、パルスMAGによるUリブの溶接技術が特開2007−118032号公報(特許文献2)にあるが、特許文献2に記載の技術においても仮付け溶接部の片側水平すみ肉溶接においては安定した溶け込み深さを得ることができないという問題があった。   On the other hand, U-rib welding technology using pulse MAG is disclosed in Japanese Patent Application Laid-Open No. 2007-118032 (Patent Document 2), but the technique described in Patent Document 2 is also stable in one-side horizontal fillet welding of a tack welded portion. There was a problem that the penetration depth could not be obtained.
特開平8−281476号公報JP-A-8-281476 特開2007−118032号公報Japanese Patent Laid-Open No. 2007-118032
本発明は、仮付け溶接ビードが有る箇所においても深い溶け込みが得られ、スパッタ発生量の少ない片側水平すみ肉ガスシールドアーク溶接方法を提供することを目的とする。   An object of the present invention is to provide a one-side horizontal fillet gas shielded arc welding method in which deep penetration can be obtained even at a place where a tack weld bead is present and the amount of spatter generated is small.
本発明の要旨は、下板および立板からなる水平すみ肉溶接用部材の該立板が傾斜した、すみ肉角度が90°超の水平すみ肉部の溶接を行う片側水平すみ肉ガスシールドアーク溶接方法において、ソリッドワイヤを用いて、ワイヤ送給速度:15〜17m/min、パルスピーク電流(Ip):480〜600A、パルスベース電流(Ib):30〜80A、パルス周波数:200〜300Hzで、かつパルスピーク電流(Ip)とパルスピーク時間(Tp)が下記(1)式を満足するパルスを付加して溶接を行うことを特徴とする。
また、パルスベース電流(Ib)からパルスピーク電流(Ip)までの立上り時間(Tu)が0.8msec以下、パルスピーク電流(Ip)からパルスベース電流(Ib)までの立下り時間(Td)が0.8msec以下であることを特徴とする。
さらに、ワイヤ狙い位置が立板のエッジ部から上方に1〜2mmであることも特徴とする片側水平すみ肉ガスシールドアーク溶接方法にある。
480≦Ip[A]×Tp[msec]≦900 ・・・・(1)
The gist of the present invention is a one-side horizontal fillet gas shielded arc for welding a horizontal fillet portion having a fillet angle of more than 90 °, in which the vertical plate of a horizontal fillet welding member comprising a lower plate and a vertical plate is inclined. In the welding method, using a solid wire, wire feed speed: 15 to 17 m / min, pulse peak current (Ip): 480 to 600 A, pulse base current (Ib): 30 to 80 A, pulse frequency: 200 to 300 Hz In addition, welding is performed by adding a pulse whose pulse peak current (Ip) and pulse peak time (Tp) satisfy the following expression (1).
Further, the rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) is 0.8 msec or less, and the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) is It is 0.8 msec or less.
Furthermore, the one-sided horizontal fillet gas shielded arc welding method is characterized in that the aiming position of the wire is 1 to 2 mm upward from the edge portion of the standing plate.
480 ≦ Ip [A] × Tp [msec] ≦ 900 (1)
本発明によれば、仮付け溶接ビードが有る箇所においても深い溶け込みが得られ、スパッタ発生量が少なく高能率な溶接が可能な片側水平すみ肉ガスシールドアーク溶接方法を提供することができる。   According to the present invention, it is possible to provide a one-sided horizontal fillet gas shielded arc welding method in which deep penetration can be obtained even at a place where a tack weld bead is present, and the amount of spatter generation is small and highly efficient welding is possible.
本発明が対象とする傾斜した立板のすみ肉溶接部を示す断面図である。It is sectional drawing which shows the fillet weld part of the inclined standing board which this invention makes object. 本発明における溶け込み率算出の説明図である。It is explanatory drawing of the penetration rate calculation in this invention. 本発明における仮付け無し部(a)および仮付け有り部(b)のワイヤ狙い位置を示す断面図である。It is sectional drawing which shows the wire aim position of the part with no temporary attachment (a) and the part with temporary attachment (b) in this invention. 閉断面形式のUトラフ形リブの断面図(a)および開断面形式の縦リブ(b)を示す断面図である。It is sectional drawing which shows the cross-sectional view (a) of the U trough-shaped rib of a closed cross-section format, and the vertical rib (b) of an open cross-section format.
Uリブの接合においては、図1に示すように立板1の傾斜によってすみ肉角度θが90°超のすみ肉溶接となる。このような片側すみ肉ガスシールドアーク溶接方法においては、図2に示すように構造物の強度の確保面から立板1の板厚Tに対する溶け込み深さtが、溶け込み率((t/T)×100)として75%以上を要望される。そこで本発明者らは、ソリッドワイヤを用いて図3(a)に示す仮付け無しは勿論、図3(b)に示す仮付け溶接部5を有するすみ肉部においても、所要の溶け込み率が得られる片側水平すみ肉ガスシールドアーク溶接の施工条件について詳細に検討した。   In joining the U ribs, fillet welding in which the fillet angle θ exceeds 90 ° is achieved by the inclination of the upright plate 1 as shown in FIG. In such a one-sided fillet gas shielded arc welding method, as shown in FIG. 2, the penetration depth t with respect to the plate thickness T of the upright plate 1 from the securing surface of the structure is the penetration rate ((t / T)). X100) is required to be 75% or more. Therefore, the present inventors use a solid wire to provide the required penetration rate not only in the case of the temporary attachment shown in FIG. 3 (a) but also in the fillet portion having the temporary welded portion 5 shown in FIG. 3 (b). The construction conditions of the obtained one-sided horizontal fillet gas shielded arc welding were examined in detail.
その結果、特定の条件を満たしたパルスMAG溶接で片側水平すみ肉ガスシールドアーク溶接すると良好な溶接継手が得られることが判明した。すなわち、ワイヤ供給量、パルスピーク電流(Ip)、パルスベース電流(Ib)、パルス周波数およびパルスピーク電流(Ip)とパルスピーク時間(Tp)との積、ならびにパルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)およびパルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下り時間(Td)、さらにワイヤの狙い位置を限定することによりアークが安定してスパッタ発生量が少なく、仮付け溶接部においても深い溶け込みが得られることを見出した。   As a result, it has been found that a good welded joint can be obtained by one-side horizontal fillet gas shielded arc welding by pulse MAG welding satisfying specific conditions. That is, the wire supply amount, the pulse peak current (Ip), the pulse base current (Ib), the pulse frequency and the product of the pulse peak current (Ip) and the pulse peak time (Tp), and the pulse base current (Ib) to the pulse peak By limiting the rise time (Tu) of the current (Ip) period and the pulse peak current (Ip) to the fall time (Td) of the pulse base current (Ib) period, and the target position of the wire, the arc can be stably sputtered. It has been found that the amount of generation is small and deep penetration can be obtained even in the tack weld zone.
パルスMAG溶接はパルス電源により平均溶接電流より高電流となるピーク電流と平均電流より低電流としたベース電流を周期的に付加する溶接方法である。このようにしてピーク電流期間でワイヤを溶融しベース電流期間で溶滴を溶融池に移行させることにより、平均のアーク電圧が低い場合でも溶滴が溶融池と短絡することなく溶滴を移行させることができる。パルスMAG溶接においてはワイヤの溶融エネルギーを適正にすることにより1回のパルスピーク電流時に1個の溶滴を生成させ、ベース電流期間に溶滴を移行させる。このような1パルス−1ドロップ移行となるパルス条件により、溶滴はスムーズに溶融池に移行しスパッタ発生量が低減される。以下に本発明の片側水平すみ肉ガスシールドアーク溶接方法について詳細に説明する。   Pulse MAG welding is a welding method in which a peak current that is higher than the average welding current and a base current that is lower than the average current are periodically added by a pulse power source. In this way, by melting the wire in the peak current period and transferring the droplet to the molten pool in the base current period, the droplet is transferred without short-circuiting the molten pool even when the average arc voltage is low. be able to. In pulse MAG welding, one droplet is generated at the time of one pulse peak current by making the melting energy of the wire appropriate, and the droplet is transferred during the base current period. Under such a pulse condition of 1 pulse-1 drop transition, the droplet smoothly moves to the molten pool, and the amount of spatter generated is reduced. The one-side horizontal fillet gas shield arc welding method of the present invention will be described in detail below.
[ワイヤ送給速度:15〜17m/min]
ワイヤ送給速度は、溶け込み率およびアークの安定性に大きく影響する。ワイヤ送給速度が15m/min未満であると、特に仮付け溶接部での溶け込み率が得られない。一方、ワイヤ送給速度が17m/minを超えると、アークが不安定となる。また、ビードが下脚側に垂れてビード外観が不良になる。さらに、溶融金属が立板を貫通して溶け落ちして溶接できなくなる場合がある。したがって、ワイヤ送給速度は15〜17m/minとする。
[Wire feeding speed: 15-17m / min]
The wire feed speed has a great influence on the penetration rate and the arc stability. When the wire feed speed is less than 15 m / min, it is not possible to obtain a penetration rate particularly at the tack welded portion. On the other hand, when the wire feed speed exceeds 17 m / min, the arc becomes unstable. In addition, the bead hangs to the lower leg side, and the bead appearance becomes poor. Furthermore, there are cases where the molten metal penetrates the standing plate and melts and cannot be welded. Therefore, the wire feeding speed is 15 to 17 m / min.
[パルスピーク電流(Ip):480〜600A]
パルスピーク電流(Ip)は、溶滴の生成および溶滴の移行性に大きく影響する。パルスピーク電流(Ip)が480A未満であると、溶滴の生成が不安定になり溶滴が1パルス1ドロップとならずスパッタ発生量が多くなる。一方、パルスピーク電流(Ip)が600Aを超えると、アークが不安定になりスパッタ発生量が多くなる。したがって、パルスピーク電流(Ip)は480〜600Aとする。
[Pulse peak current (Ip): 480 to 600 A]
The pulse peak current (Ip) greatly affects the formation of droplets and the transferability of droplets. If the pulse peak current (Ip) is less than 480 A, the formation of droplets becomes unstable, and the droplets do not become one drop per pulse, and the amount of spatter generated increases. On the other hand, when the pulse peak current (Ip) exceeds 600 A, the arc becomes unstable and the amount of spatter generated increases. Therefore, the pulse peak current (Ip) is 480 to 600A.
[パルスベース電流(Ib):30〜80A]
パルスベース電流(Ib)はベース期間でアークを保持できる電流値が必要となる。パルスベース電流(Ib)が30A未満であると、溶滴の移行性が不安定となりスパッタ発生量が多くなる。一方、パルスベース電流(Ib)が80Aを超えると、溶滴の離脱が速やかに行われずアークが不安定となってスパッタ発生量が多くなる。また、平均電流が高くなってビードが下脚側に垂れてビード外観が不良になる。したがって、パルスベース電流(Ib)は30〜80Aとする。
[Pulse base current (Ib): 30-80A]
The pulse base current (Ib) requires a current value that can hold the arc in the base period. If the pulse base current (Ib) is less than 30 A, the transferability of the droplets becomes unstable and the amount of spatter generated increases. On the other hand, when the pulse base current (Ib) exceeds 80 A, the droplets are not detached quickly, the arc becomes unstable, and the amount of spatter generated increases. In addition, the average current increases and the bead hangs to the lower leg side, resulting in a poor bead appearance. Therefore, the pulse base current (Ib) is 30 to 80A.
[パルス周波数:200〜300Hz]
パルス周波数は溶滴を1パルス1ドロップの移行とするのに重要である。パルス周波数が200Hz未満および300Hz超であると、溶滴が1パルス1ドロップの移行とならずアークが不安定でスパッタ発生量が多くなる。また、溶け込み率も不安定となり仮付け溶接部では溶け込み率が得られない。したがって、パルス周波数は200〜300Hzとする。
[Pulse frequency: 200 to 300 Hz]
The pulse frequency is important for the transition of the droplet to one pulse and one drop. When the pulse frequency is less than 200 Hz and more than 300 Hz, the droplet does not shift by one pulse and one drop, the arc is unstable, and the amount of spatter generated increases. Further, the penetration rate becomes unstable, and the penetration rate cannot be obtained at the tack welded portion. Therefore, the pulse frequency is 200 to 300 Hz.
[パルスピーク電流(Ip)とパルスピーク時間(Tp)の積:480≦Ip[A]×Tp[msec]≦900]
下記(1)式で示すパルスピーク電流(Ip)とパルスピーク時間(Tp)の積(Ip×Tp)で得られる値を限定することによって、短いピーク時間の領域でワイヤを溶融しベース電流時に溶滴を移行させる1パルス1ドロップがスムーズになる。パルスピーク電流(Ip)とパルスピーク時間(Tp)の積(Ip×Tp)が480[A・msec]未満であると、ピーク電流期間で溶滴を形成するためのエネルギーが不足して十分な溶滴の形成ができずスパッタ発生量が多くなる。また、溶け込み率も不安定となり仮付け溶接部では溶け込み率が得られない。一方、900[A・msec]を超えると、過度に成長した溶滴が短絡しやすくなり再点弧時のアーク力で溶融池から溶融金属が吹き飛ばされスパッタ発生量が多くなる。したがって、パルスピーク電流(Ip)とパルスピーク時間(Tp)の積(Ip×Tp)は480〜900[A・msec]とする。
480≦Ip[A]×Tp[msec]≦900 ・・・・(1)
[Product of pulse peak current (Ip) and pulse peak time (Tp): 480 ≦ Ip [A] × Tp [msec] ≦ 900]
By limiting the value obtained by the product (Ip × Tp) of the pulse peak current (Ip) and the pulse peak time (Tp) expressed by the following equation (1), the wire is melted in the short peak time region, One pulse and one drop for transferring droplets is smooth. When the product (Ip × Tp) of the pulse peak current (Ip) and the pulse peak time (Tp) is less than 480 [A · msec], there is insufficient energy to form droplets in the peak current period. A droplet cannot be formed, and the amount of spatter generated increases. Further, the penetration rate becomes unstable, and the penetration rate cannot be obtained at the tack welded portion. On the other hand, when it exceeds 900 [A · msec], the excessively grown droplets are easily short-circuited, and the molten metal is blown from the molten pool by the arc force at the time of re-ignition, resulting in an increase in the amount of spatter. Therefore, the product (Ip × Tp) of the pulse peak current (Ip) and the pulse peak time (Tp) is 480 to 900 [A · msec].
480 ≦ Ip [A] × Tp [msec] ≦ 900 (1)
[パルスベース電流(Ib)からパルスピーク電流(Ip)までの立上り時間(Tu):0.8msec以下、パルスピーク電流(Ip)からパルスベース電流(Ib)までの立下り時間(Td):0.8msec以下]
パルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)およびパルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下り時間(Td)が0.8msecを超えると、1パルス1ドロップのパルス条件が得難い。特に立下り時間(Td)が0.8msecを超えると溶滴の移行が円滑でなく溶け込み特性も不安定となり、さらにはスパッタ発生量も多くなる。したがって、パルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)およびパルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下り時間(Td)は0.8msec以下とする。なお、パルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)およびパルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下り時間(Td)の下限は0.2msec以上であれば1パルス1ドロップのパルス条件が得られる。
[Rise time (Tu) from pulse base current (Ib) to pulse peak current (Ip): 0.8 msec or less, Fall time (Td) from pulse peak current (Ip) to pulse base current (Ib): 0 .8 msec or less]
When the rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) period and the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) period exceed 0.8 msec, It is difficult to obtain a pulse condition of one pulse and one drop. In particular, when the fall time (Td) exceeds 0.8 msec, the transition of the droplets is not smooth, the penetration characteristics become unstable, and the amount of spatter generated increases. Therefore, the rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) period and the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) period are 0.8 msec or less. To do. The lower limit of the rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) period and the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) period is 0.2 msec. If it is above, the pulse condition of 1 pulse 1 drop is obtained.
[ワイヤ狙い位置:立板エッジ部から上方に1〜2mm]
ワイヤ狙い位置は溶け込み率に影響する。図3(a)に示すワイヤ狙い位置の立板エッジ部から上方への距離hが1mm未満であると、溶接金属の溶け込み中央部が下板側となり、仮付けがない部分でも必要とする溶け込み率が得られない。一方、ワイヤ狙い位置の立板エッジ部から上方への距離hが2mmを超えると、立板側の脚長が大きくなりビード外観が不良となる。また、溶融金属が立板を貫通して溶接できなくなる場合がある。したがって、ワイヤ狙い位置は立板エッジ部から上方への距離hとして1〜2mmとする。
[Wire target position: 1-2mm upward from the edge of the vertical plate]
The wire target position affects the penetration rate. If the distance h from the standing plate edge at the wire target position shown in FIG. 3 (a) is less than 1 mm, the weld metal penetration center is on the lower plate side, and the required penetration even in the portion without tacking The rate is not obtained. On the other hand, when the distance h from the standing edge portion at the wire aiming position exceeds 2 mm, the leg length on the standing plate side becomes large and the bead appearance becomes poor. In addition, the molten metal may not be able to weld through the standing plate. Therefore, the wire aiming position is set to 1 to 2 mm as the distance h upward from the standing plate edge.
本発明における立板の傾斜角度θは90°超とするが、溶け込み率および溶着量の確保から95〜120°であることが望ましい。
なお、仮付け溶接の脚長は溶け込み率の確保から4mm未満であることが好ましい。また、立板端部を開先加工して溶接すれば溶け込み率は大きくなるが、溶着量が不足して多層盛り溶接にしなければならず溶接能率が悪くなる。
In the present invention, the inclination angle θ of the standing plate is more than 90 °, but it is preferably 95 to 120 ° from the viewpoint of ensuring the penetration rate and the welding amount.
In addition, it is preferable that the leg length of tack welding is less than 4 mm from ensuring the penetration rate. Further, if the end of the vertical plate is welded by performing groove processing, the penetration rate increases, but the welding amount is insufficient and the multi-layer welding must be performed, resulting in poor welding efficiency.
本発明におけるシールドガスは、溶け込み率の確保およびスパッタ発生量の低減からAr−5〜30%COの混合ガスであることが好ましい。またワイヤ径は、溶け込み率および良好なビード外観の確保から1.2mmまたは1.4mmであることが好ましい。
以下、実施例により本発明をさらに具体的に説明する。
The shielding gas in the present invention is preferably a mixed gas of Ar-5 to 30% CO 2 from the viewpoint of ensuring the penetration rate and reducing the amount of spatter generated. The wire diameter is preferably 1.2 mm or 1.4 mm from the viewpoint of ensuring the penetration rate and good bead appearance.
Hereinafter, the present invention will be described more specifically with reference to examples.
図1に示すような立板1および下板2からなり立板1を傾斜したすみ肉試験体(鋼種:SM490B、縦板:板厚6および9mm、幅100mm、長さ500mm、下板:板厚20mm、幅150mm、長さ500mm)に、表1に示す各種溶接条件で図2に示すように水平すみ肉溶接をした。   A fillet test body (steel type: SM490B, vertical plate: plate thickness 6 and 9 mm, width 100 mm, length 500 mm, lower plate: plate comprising the upright plate 1 and the lower plate 2 as shown in FIG. Horizontal fillet welding was performed on various welding conditions shown in Table 1 to a thickness of 20 mm, a width of 150 mm, and a length of 500 mm as shown in FIG.
ワイヤはJIS Z3312 YGW12の1.2mmを用いた。また、試験板の長さ中央に長さ100mm、脚長4mmの仮付け溶接をした。溶接速度は、立板の板厚が6mmの場合40cm/min、9mmの場合は35cm/minとし、溶接は同一条件で繰り返して3体行った。   As a wire, 1.2 mm of JIS Z3312 YGW12 was used. Further, tack welding with a length of 100 mm and a leg length of 4 mm was performed at the center of the length of the test plate. The welding speed was 40 cm / min when the plate thickness of the upright plate was 6 mm, and 35 cm / min when the thickness was 9 mm, and the welding was repeated three times under the same conditions.
溶接時にスパッタ発生量の測定、高速度カメラによる溶滴の移行状態の観察、アーク状態の観察を行い、溶接後にビード外観の観察および溶け込み率の測定を行った。なお、スパッタ発生量は捕集量が0.5g/min以下を良好とした。溶け込み率は仮付け有りおよび仮付け無しの部分からそれぞれ6個の断面マクロ試験片を採取し、図2に示すように各断面で溶け込み深さtを測定し、立板の板厚Tに対する溶け込み率を算出した。溶け込み率は各断面間の最低値が75%以上を良好とした。それらの結果を表2にまとめて示す。   The amount of spatter generated during welding was observed, the transition state of the droplets was observed with a high-speed camera, and the state of the arc was observed. After welding, the appearance of the beads and the penetration rate were measured. The amount of spatter generated was good when the collected amount was 0.5 g / min or less. As for the penetration rate, 6 cross-section macro specimens were sampled from the portions with and without tacking, and the penetration depth t was measured at each cross section as shown in FIG. The rate was calculated. As for the penetration rate, the minimum value between the cross sections was 75% or more. The results are summarized in Table 2.
表1および表2中試験No.1〜10は本発明例、試験No.11〜20は比較例である。
本発明例である試験No.1〜10は、ワイヤ送給量、パルスピーク電流(Ip)、パルスベース電流(Ib)、パルス周波数、パルスピーク電流(Ip)とパルスピーク時間(Tp)との積およびパルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)、パルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下り時間(Td)、さらにワイヤの狙い位置が適正であるので、スパッタ発生量が少なく、溶滴の移行状態、アーク状態およびビード外観が良好で、仮付け有り無し部ともに十分な溶け込み率得られるなど、極めて満足な結果であった。
In Tables 1 and 2, test no. 1 to 10 are examples of the present invention, test Nos. 11 to 20 are comparative examples.
Test No. which is an example of the present invention. 1 to 10 are wire feed amount, pulse peak current (Ip), pulse base current (Ib), pulse frequency, product of pulse peak current (Ip) and pulse peak time (Tp), and pulse base current (Ib). Since the rise time (Tu) of the pulse peak current (Ip) period from the pulse peak current (Ip) to the fall time (Td) of the pulse base current (Ib) period, and the target position of the wire are appropriate, spatter is generated The amount was small, the droplet transfer state, the arc state, and the bead appearance were good, and a satisfactory penetration rate was obtained for both the portions with and without tacking.
比較例中試験No.11は、ワイヤ送給速度が遅いので、仮付け有り部での溶け込み率が低かった。また、パルスベース電流(Ib)からパルスピーク電流(Ip)期間の立上がり時間(Tu)が長いので、溶滴移行状態が不良でスパッタ発生量もやや多かった。   Test No. in Comparative Examples. No. 11 had a low wire feed rate, so the penetration rate at the part with tack was low. Further, since the rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) period is long, the droplet transfer state is poor and the amount of spatter generated is somewhat large.
試験No.12は、ワイヤ送給速度が速いので、アークが不安定で下脚側にビードが垂れて脚長が大となりビード外観が不良で、一部溶融金属が立板を貫通した。また、パルスピーク電流(Ip)からパルスベース電流(Ib)期間の立下がり時間(Td)が長いので、溶滴移行状態が不良でスパッタ発生量も多く、仮付け有り部は溶け込み率が低かった。   Test No. In No. 12, since the wire feeding speed was high, the arc was unstable, the bead hanged on the lower leg side, the leg length was large, the bead appearance was poor, and some molten metal penetrated the standing plate. Also, since the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) period is long, the droplet transfer state is poor, the amount of spatter is large, and the portion with tack is low in the penetration rate .
試験No.13は、パルスピーク電流(Ip)が低いので、溶滴移行状態が不良でスパッタ発生量も多かった。また、ワイヤ狙い位置が立板のエッジ部から上方へ離れすぎているので、立板側の脚長が大きくなりビード外観が不良で、一部溶融金属が立板を貫通した。   Test No. In No. 13, since the pulse peak current (Ip) was low, the droplet transfer state was poor and the amount of spatter was large. Moreover, since the wire aiming position is too far away from the edge portion of the standing plate, the leg length on the standing plate side becomes large, the bead appearance is poor, and a part of the molten metal penetrates the standing plate.
試験No.14は、パルスピーク電流(Ip)が高いので、アークが不安定でスパッタ発生量も多かった。また、ワイヤ狙い位置が立板のエッジ部であるので、下板側の脚長が大きくなりビード外観が不良で、仮付け無し部および仮付け有り部ともに溶け込み率が低かった。   Test No. No. 14 had a high pulse peak current (Ip), so the arc was unstable and the amount of spatter was large. Further, since the target position of the wire is the edge portion of the standing plate, the leg length on the lower plate side is increased, the bead appearance is poor, and the penetration rate is low in both the portion with no temporary attachment and the portion with temporary attachment.
試験No.15は、パルスベース電流(Ib)が低いので、溶滴移行状態が不良でスパッタ発生量も多かった。
試験No.16は、パルスベース電流(Ib)が高いので、溶滴移行状態が不良でスパッタ発生量が多く、下板側の脚長が大きくなりビード外観もであった。
Test No. No. 15, since the pulse base current (Ib) was low, the droplet transfer state was poor and the amount of spatter generated was large.
Test No. In No. 16, since the pulse base current (Ib) was high, the droplet transfer state was poor, the amount of spatter was large, the leg length on the lower plate side was increased, and the bead appearance was also observed.
試験No.17はパルス周波数が低く、試験No.18はパルス周波数が高いので、いずれも溶滴移行状態が不良でスパッタ発生量が多く、仮付け有り部の溶け込み率が低かった。   Test No. No. 17 has a low pulse frequency. Since No. 18 had a high pulse frequency, the droplet transfer state was poor, the amount of spatter was large, and the penetration rate of the part with tack was low.
試験No.19は、パルスピーク電流(Ip)とパルスピーク時間(Tp)の積が低いので、溶滴移行状態が不良でスパッタ発生量も多かった。また、仮付け有り部の溶け込み率が低かった。
試験No.20は、パルスピーク電流(Ip)とパルスピーク時間(Tp)の積が高いので、スパッタ発生量が多かった。
Test No. In No. 19, the product of the pulse peak current (Ip) and the pulse peak time (Tp) was low, so the droplet transfer state was poor and the amount of spatter was large. Moreover, the penetration rate of the part with temporary attachment was low.
Test No. No. 20, because the product of the pulse peak current (Ip) and the pulse peak time (Tp) was high, the amount of spatter generated was large.
1 立板(Uリブ)
2 下板
3 溶接金属
4 溶接用ワイヤ
5 仮付けビード
7 立板(開断面形式の縦リブ)
T 立板の板厚
t 溶け込み深さ
h 立板エッジ部からのワイヤ狙い位置までの距離
1 Standing plate (U rib)
2 Lower plate 3 Weld metal 4 Welding wire 5 Temporary bead 7 Standing plate (vertical rib in open section)
T Thickness of vertical plate t Depth of penetration h Distance from vertical plate edge to target wire position

Claims (3)

  1. 下板および立板からなる水平すみ肉溶接用部材の該立板が傾斜した、すみ肉角度が90°超の水平すみ肉部の溶接を行う片側水平すみ肉ガスシールドアーク溶接方法において、ソリッドワイヤを用いて、ワイヤ送給速度:15〜17m/min、パルスピーク電流(Ip):480〜600A、パルスベース電流(Ib):30〜80A、パルス周波数:200〜300Hzで、かつパルスピーク電流(Ip)とパルスピーク時間(Tp)が下記(1)式を満足するパルスを付加して溶接を行うことを特徴とする片側水平すみ肉ガスシールドアーク溶接方法。
    480≦Ip[A]×Tp[msec]≦900 ・・・・(1)
    In a one-side horizontal fillet gas shield arc welding method for welding a horizontal fillet portion having a fillet angle exceeding 90 °, in which the vertical plate of a member for horizontal fillet welding comprising a lower plate and a vertical plate is inclined, a solid wire , Wire feed speed: 15-17 m / min, pulse peak current (Ip): 480-600 A, pulse base current (Ib): 30-80 A, pulse frequency: 200-300 Hz, and pulse peak current ( Ip) and pulse peak time (Tp) are applied by applying a pulse satisfying the following formula (1) for welding, and a one-sided horizontal fillet gas shielded arc welding method.
    480 ≦ Ip [A] × Tp [msec] ≦ 900 (1)
  2. パルスベース電流(Ib)からパルスピーク電流(Ip)までの立上り時間(Tu)が0.8msec以下、パルスピーク電流(Ip)からパルスベース電流(Ib)までの立下り時間(Td)が0.8msec以下であることを特徴とする請求項1に記載の片側水平すみ肉ガスシールドアーク溶接方法。 The rise time (Tu) from the pulse base current (Ib) to the pulse peak current (Ip) is 0.8 msec or less, and the fall time (Td) from the pulse peak current (Ip) to the pulse base current (Ib) is 0. The one-side horizontal fillet gas shielded arc welding method according to claim 1, wherein the method is 8 msec or less.
  3. ワイヤ狙い位置が立板のエッジ部から上方に1〜2mmであることを特徴とする請求項1または請求項2に記載の片側水平すみ肉ガスシールドアーク溶接方法。 The one-side horizontal fillet gas shielded arc welding method according to claim 1 or 2, wherein the wire aiming position is 1 to 2 mm upward from the edge portion of the standing plate.
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CN106312353A (en) * 2016-10-19 2017-01-11 武船重型工程股份有限公司 U-shaped rib welding device and method
CN106624417A (en) * 2016-10-19 2017-05-10 武船重型工程股份有限公司 Detecting method for appearance quality of welding seam inside U-shaped rib
CN106346115A (en) * 2016-11-01 2017-01-25 武船重型工程股份有限公司 Method for repairing inside weld seam of U rib plate
CN110666290A (en) * 2019-10-28 2020-01-10 中铁山桥集团有限公司 Full penetration welding method for U-shaped rib angle welding seam

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