JP2014004609A - Weld joint and method for forming the same - Google Patents
Weld joint and method for forming the same Download PDFInfo
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Abstract
Description
本発明は、鋼板の隅肉溶接によって形成される溶接継手に関し、特に自動車のシャシー部品に好適な疲労特性に優れた溶接継手およびその形成方法に関するものである。 The present invention relates to a welded joint formed by fillet welding of steel plates, and more particularly to a welded joint excellent in fatigue characteristics suitable for automobile chassis parts and a method for forming the same.
自動車のシャシー部品や建設機械、橋梁等の部材には、隅肉溶接が多用され、かつ高い疲労特性が要求されるが、その際、溶接ビードを機械加工で滑らかに仕上げることによって、溶接継手に応力集中が起こるのを抑制して、疲労強度を高めている。しかし、このような溶接ビードの機械加工には多大な労力を要するので、溶接ビードの機械加工を行なわずに溶接継手の疲労特性を向上する技術が種々検討されてきている。 Fillet welding is frequently used for automobile chassis parts, construction machinery, bridges, and other components, and high fatigue properties are required. At that time, the weld bead is machined to make it a welded joint. It suppresses the occurrence of stress concentration and increases fatigue strength. However, since the machining of such a weld bead requires a great deal of labor, various techniques for improving the fatigue characteristics of a welded joint without machining the weld bead have been studied.
隅肉溶接における溶接継手の疲労破壊とは、図４に示すように、２枚の鋼板（主板１、上板２）のうちの主板１に、矢印Ａで示すような反復応力が繰り返し作用することで、主板１側の溶接ビード３の端部４（溶接止端部）から亀裂が発生し、さらに主板１の裏面方向へ亀裂が進行することによって、主板１が破断する現象である。従って、溶接継手の疲労破壊を抑止するためには、まず溶接止端部４から発生する亀裂を抑制する必要がある。
As shown in FIG. 4, fatigue fracture of a welded joint in fillet welding means that repeated stress as indicated by arrow A repeatedly acts on the main plate 1 of two steel plates (main plate 1 and upper plate 2). As a result, a crack is generated from the end 4 (weld toe) of the
このような問題に対し、特許文献１には、非消耗電極で溶接ビードの表面層を再溶融させ、その裏面形状を成形することで溶接継手の形状を整形し、溶接継手部の疲労強度を改善する技術が開示されている。すなわち、溶接ままの溶接ビードは、表面張力によって凸形状となり易いので、その溶接ビードを再溶融すれば、溶接ビードは凸部が均されて全体的に平滑となる。 For such a problem, Patent Document 1 discloses that the surface layer of the weld bead is remelted with a non-consumable electrode, the shape of the back surface of the weld bead is shaped, and the fatigue strength of the welded joint is increased. Techniques for improving are disclosed. That is, the weld bead as welded tends to have a convex shape due to the surface tension. Therefore, if the weld bead is remelted, the convex portion of the weld bead is leveled and becomes smooth as a whole.
また、特許文献２には、ホイールの組付け溶接において、溶接ビードの始端および終端部の接触角を130度以上に局所的に修正して応力の集中部位をなくし、部材としての疲労特性を向上する技術が開示されている。すなわち、溶接ままの溶接ビード始端部は、部材温度が低く表面張力によって凸となり易く、また溶接ビード終端部はアークの停止によって不連続な形状となり易いため、上記接触角とすることで、鋼板の疲労特性の向上が期待できる。
Further, in
しかしながら、特許文献１に開示された技術は、溶接ビードを削除するものではなく、溶接ビードそのものを再溶融し整形するために、溶接ビードの幅および溶接金属量はそのままであり、平滑化効果は限定的である。また、溶接によって生じたアンダーカットはそのまま残るため、これに集中する応力の緩和効果は小さい。結果として大きな疲労強度向上効果は得られない。 However, the technique disclosed in Patent Document 1 does not delete the weld bead, and in order to remelt and shape the weld bead itself, the width of the weld bead and the amount of weld metal remain the same, and the smoothing effect is Limited. Moreover, since the undercut produced by welding remains as it is, the effect of relieving stress concentrated on this is small. As a result, a large fatigue strength improvement effect cannot be obtained.
また、特許文献２に開示された技術もまた、溶接ビードを削除するものではなく、溶接ビードそのものを再溶融して整形するために、溶接ビードの幅および溶接金属量はそのままであり、平滑化効果は限定的である。
なお、発明者らの研究によって、溶接ビードそのものを再溶融し整形するだけでは溶接ビードの平滑化には限界があることが分かっている。
In addition, the technique disclosed in
In addition, it has been found by the inventors' research that there is a limit to smoothing the weld bead only by remelting and shaping the weld bead itself.
本発明は、上記した問題を有利に解決するもので、溶接継手の主板に対して反復応力が繰り返し作用した場合に、溶接止端部への応力集中を効果的に抑制し、優れた疲労特性を発現する溶接継手を、その有利な形成方法と共に提案することを目的とする。 The present invention advantageously solves the above-described problems, and when repeated stress is repeatedly applied to the main plate of the welded joint, it effectively suppresses stress concentration at the weld toe and has excellent fatigue characteristics. It aims at proposing the welded joint which expresses with the advantageous formation method.
発明者らは、上記した問題を解決するために、溶接した鋼板（すなわち主板）の溶接ビードに機械加工を施すことなく、主板と溶接ビードとの境界（溶接止端部）近辺をなだらかに形成することで、反復応力による応力集中を抑制するための技術を鋭意検討した。 In order to solve the above-mentioned problems, the inventors gently form the vicinity of the boundary between the main plate and the weld bead (the weld toe) without machining the weld bead of the welded steel plate (that is, the main plate). By doing so, we have intensively studied techniques for suppressing stress concentration due to repetitive stress.
そして、溶接止端部を中心として主板と溶接ビードの両方を再溶融して整形することで、隅肉溶接が施された溶接継手の疲労特性を効果的に改善できることを突き止めた。
本発明は、上記の知見に基づき、完成されたものである。
And it was found that the fatigue characteristics of the welded joint subjected to fillet welding can be effectively improved by remelting and shaping both the main plate and the weld bead around the weld toe.
The present invention has been completed based on the above findings.
すなわち、本発明の要旨構成は次のとおりである。
１．板厚が1.2mm以上の鋼板を隅肉溶接したのち、溶接ビードの止端部を中心として再溶融して得た溶接継手であって、該溶接ビードと鋼板との再溶融部の幅をＷ（mm）、また再溶融部の見掛け高さをＨ（mm）としたとき、これらＷおよびＨが下記の（1）式および（2）式を満足することを特徴とする鋼板の溶接継手。
記
３≦Ｗ≦５ｔ ・・・（1）
２Ｈ≦Ｗ ・・・（2）
ここで ｔ（mm）：鋼板の板厚
That is, the gist configuration of the present invention is as follows.
1. This is a welded joint obtained by remelting a fillet welded steel plate with a thickness of 1.2 mm or more around the toe of the weld bead, where the width of the remelted portion between the weld bead and the steel plate is W A welded joint for steel plate, wherein W and H satisfy the following formulas (1) and (2), where (mm) and the apparent height of the remelted part is H (mm).
3 ≦ W ≦ 5t (1)
2H ≦ W (2)
Where t (mm): Steel plate thickness
２．ブラケットの取り付け部に、前記１に記載の溶接継手を適用したことを特徴とする自動車用シャシー部材。 2. An automobile chassis member, wherein the welded joint according to 1 is applied to a mounting portion of the bracket.
３．前記１に記載の溶接継手を形成するにあたり、鋼板を隅肉溶接したのち、溶接ビードの止端部を中心として溶接ビードと鋼板とを再溶融するに際し、再溶融の熱源としてプラズマを用いるものとし、該プラズマの電流：50〜100Ａ、該プラズマのトーチ先端と鋼材との距離：２〜５mm、該再溶融部の中心と溶接ビード止端部との距離：1.5mm以内および該プラズマトーチ速度：200〜600mm／分の条件で再溶融処理を行うことを特徴とする溶接継手の形成方法。 3. In forming the weld joint as described in 1 above, plasma is used as a heat source for remelting when the weld bead and the steel plate are remelted around the toe portion of the weld bead after the steel plate is fillet welded. The plasma current: 50 to 100 A, the distance between the plasma torch tip and the steel material: 2 to 5 mm, the distance between the center of the remelted portion and the weld bead toe: within 1.5 mm, and the plasma torch speed: A method for forming a welded joint, comprising performing remelting treatment at 200 to 600 mm / min.
本発明によれば、隅肉溶接を施した溶接継手に対し、反復応力が繰り返し作用した場合の溶接止端部への応力集中を効果的に制御することが可能であり、その結果、優れた疲労特性を有する溶接継手を得ることができる。 According to the present invention, it is possible to effectively control the stress concentration at the weld toe when repeated stress is repeatedly applied to the welded joint subjected to fillet welding, and as a result, excellent A welded joint having fatigue properties can be obtained.
以下、本発明を具体的に説明する。
図１〜３は、本発明の溶接継手の例をそれぞれ模式的に示す断面図である。本発明は、図１に示すように２枚の鋼板（すなわち主板１、上板２）を重ね合わせて、隅肉溶接（継手溶接）を行ない、得られた溶接ビード３の止端部および鋼板（主板１）を、プラズマを熱源として用いて再溶融５し、溶接止端部と鋼板（主板１）との接触部を平滑に処理するものである。なお、図３のようなフレア溶接継手の場合は、上板が無く主板のみとなる。
Hereinafter, the present invention will be specifically described.
1 to 3 are cross-sectional views schematically showing examples of the welded joint of the present invention. In the present invention, as shown in FIG. 1, two steel plates (namely, main plate 1 and upper plate 2) are overlapped to perform fillet welding (joint welding), and the toe portion of the obtained
〔対象板厚≧1.2mm〕
本発明での対象鋼板（主板１）は、疲労強度向上が課題とされる590MPa級以上の高張力鋼板への適用が有効である。また、その対象板厚としては、アーク溶接が可能なl.2mm以上とする必要がある。一方、対象板厚の上限は、特に限定はされないが、プラズマの溶融能力から6.0mm程度とするのが好ましい。
[Target plate thickness ≥ 1.2 mm]
The target steel plate (main plate 1) in the present invention is effective when applied to a high-tensile steel plate of 590 MPa class or higher where improvement in fatigue strength is a problem. In addition, the thickness of the target plate needs to be at least l.2 mm that allows arc welding. On the other hand, the upper limit of the target plate thickness is not particularly limited, but is preferably about 6.0 mm from the melting ability of plasma.
〔再溶融部の幅：Ｗ（mm）および再溶融部の見掛け高さ：Ｈ（mm）〕
本発明では、隅肉溶接を施して継手溶接を形成後、溶接ビードと鋼板を再溶融させることで生じた再溶融部の幅Ｗ（mm）と再溶融部の見掛け高さＨ（mm）が溶接継手の疲労強度改善効果を決める重要な項目であり、以下に示す（1）式および（2）式を満足することが必要である。
３≦Ｗ≦５ｔ ・・・（1）
２Ｈ≦Ｗ ・・・（2）
なお、本発明における再溶融部の幅：Ｗは、図１に示したように、再溶融方向に垂直でかつ主板表面に平行な方向の長さであり、再溶融部の見掛け高さ：Ｈは、主板表面から再溶融部の稜線までの高さを示している。また、鋼板が湾曲している場合には、図３に示したように、主板に再溶融端部から接線を引き、その接線方向を仮想の主板表面にして、上記定義に従いＨおよびＷを求める。
[Width of remelted portion: W (mm) and apparent height of remelted portion: H (mm)]
In the present invention, the width W (mm) of the remelted portion and the apparent height H (mm) of the remelted portion generated by remelting the weld bead and the steel plate after forming the joint weld by performing fillet welding. It is an important item that determines the fatigue strength improvement effect of welded joints, and it is necessary to satisfy the following formulas (1) and (2).
3 ≦ W ≦ 5t (1)
2H ≦ W (2)
As shown in FIG. 1, the width of the remelted portion in the present invention: W is the length in the direction perpendicular to the remelt direction and parallel to the main plate surface, and the apparent height of the remelt portion: H Indicates the height from the main plate surface to the ridgeline of the remelted part. Further, when the steel plate is curved, as shown in FIG. 3, a tangent line is drawn from the remelt end portion to the main plate, and the tangential direction is set to the virtual main plate surface to obtain H and W according to the above definition. .
〔３≦Ｗ≦５ｔ〕
再溶融部の幅：Ｗ（mm）が広いほど疲労特性改善の効果は大きいが、主板の板厚［ｔ（mm）］の５倍、すなわち５ｔ（mm）を超えると、再溶融中に、熱風過多となって溶接部が変形し、部材としての価値が下がってしまう。一方、Ｗが３mmに満たないと、再溶融による疲労改善効果が小さい。よって、再溶融部の幅：Ｗは、３mm以上で、かつ板厚の５倍以下とする必要がある。
[3 ≦ W ≦ 5t]
The wider the width of the remelted portion: W (mm), the greater the effect of improving the fatigue characteristics. However, if the thickness of the main plate exceeds 5 times the thickness [t (mm)], that is, 5 t (mm), during remelting, Excessive hot air will deform the weld and reduce the value as a member. On the other hand, if W is less than 3 mm, the effect of improving fatigue by remelting is small. Therefore, the width W of the remelted portion needs to be 3 mm or more and 5 times or less the plate thickness.
〔２Ｈ≦Ｗ 〕
再溶融部の見掛け高さＨ（mm）は、再溶融部の幅Ｗ（mm）の1/2倍を超えると溶融による疲労改善効果が小さくなる。よって、再溶融部の見掛け高さＨは、再溶融部の幅Ｗの1/2以下とする必要がある。一方、再溶融部の見掛け高さＨは、小さいほど疲労特性に優れるため、その下限に限定はないが、アンダーカット（凹み）防止の観点から、再溶融部の見掛け高さＨは、再溶融部の幅Ｗの1/6以上とするのが好ましい。
[2H ≦ W]
When the apparent height H (mm) of the remelted part exceeds 1/2 times the width W (mm) of the remelted part, the fatigue improvement effect due to melting becomes small. Therefore, the apparent height H of the remelted portion needs to be ½ or less of the width W of the remelted portion. On the other hand, the smaller the apparent height H of the remelted portion, the better the fatigue characteristics. Therefore, the lower limit is not limited, but from the viewpoint of preventing undercuts (dents), the apparent height H of the remelted portion is remelted. The width is preferably 1/6 or more of the width W of the portion.
〔熱源〕
隅肉溶接を施した溶接継手の溶接ビードと鋼板とを再溶融する場合、熱源としては、MAGアーク、TIGアーク、プラズマアークおよびレーザ等が考えられる。そのなかでも、TIGアークを改善したプラズマアークは、パイロットアーク（火種）を有することによって自動化に対応しており、電極の耐久性も改善されているため、溶接ビードと鋼板の溶融処理を行う熱源としては最も好ましい。
[Heat source]
When remelting the weld bead of the welded joint subjected to fillet welding and the steel plate, MAG arc, TIG arc, plasma arc, laser, and the like can be considered as the heat source. Among them, the plasma arc with improved TIG arc is compatible with automation by having a pilot arc (fire type), and the durability of the electrode is also improved, so the heat source for melting the weld bead and steel plate Is most preferable.
〔プラズマによる溶融の中心位置：溶接止端部からl.5mm以内〕
溶接ビードの止端部（溶接止端部）は、一般に形状が不連続になるが、本発明では、これを再溶融することで平滑化することに特徴がある。また、プラズマは、Cu電極によってプラズマアークの広がりを抑制し、熱をその中心に集中させている。
すなわち、溶接ビードの止端部を再溶融させて平滑化するためには、プラズマによる再溶融の中心付置を溶接止端部近傍とすることが重要であるが、再溶融の中心位置が溶接止端部からl.5mmを越えると、溶接止端部の形状を平滑に維持することが困難となって疲労改善効果が小さくなってくる。従って、プラズマによる再溶融の中心位置は、溶接止端部からl.5mm以内とすることが好ましい。
[Center position of melting by plasma: within l.5mm from weld toe]
The toe portion (weld toe portion) of the weld bead is generally discontinuous in shape, but the present invention is characterized in that it is smoothed by remelting it. In addition, the plasma suppresses the spread of the plasma arc by the Cu electrode and concentrates heat at the center.
In other words, in order to remelt and smooth the toe portion of the weld bead, it is important that the center of remelting by plasma is located near the weld toe portion, but the center position of remelting is the weld stop location. If it exceeds l.5 mm from the end, it becomes difficult to keep the shape of the weld toe smooth, and the fatigue improvement effect becomes small. Therefore, the center position of remelting by plasma is preferably within 1.5 mm from the weld toe.
〔プラズマトーチ先端と鋼材との距離：２〜５mm〕
プラズマトーチ先端を、鋼材表面から離すことでプラズマ気流の影響を抑え、再溶融部を平滑にすることができる。しかしながら、その距離が５mmを超えるとプラズマを安定的に維持することが困難となり、再溶融部が不連続となり易い。一方、プラズマトーチ先端と鋼材との距離を２mm未満にすると、上記したプラズマ気流の影響により、溶融部が凹形状となって疲労強度が低下し易くなる。従って、プラズマトーチ先端と鋼材との距離は、２mm以上５mm以下の範囲とすることが好ましい。
[Distance between plasma torch tip and steel: 2-5mm]
By separating the tip of the plasma torch from the steel surface, the influence of the plasma airflow can be suppressed and the remelted portion can be smoothed. However, when the distance exceeds 5 mm, it is difficult to stably maintain the plasma, and the remelted portion tends to be discontinuous. On the other hand, when the distance between the plasma torch tip and the steel material is less than 2 mm, the melted portion becomes concave due to the influence of the plasma air flow described above, and the fatigue strength is likely to be lowered. Therefore, the distance between the plasma torch tip and the steel material is preferably in the range of 2 mm or more and 5 mm or less.
〔プラズマトーチ速度：200〜600mm／分、プラズマの電流：50〜150Ａ〕
平滑で連続した溶融処理には、プラズマトーチ速度が低速で、かつプラズマの電流が高電流の条件が有利である。しかしながら、プラズマトーチ速度：200mm未満、またはプラズマの電流：150Ａ超の条件になると、溶融過多によって溶接継手が変形することになり、部材そのものの価値が下がる。一方、プラズマトーチ速度：600mm／分超、またはプラズマの電流：50Ａ未満の条件では、プラズマの入熱量が不足して再溶融部が不連続になり易い。よって、プラズマトーチ速度は200mm／分以上600mm／分以下とし、さらにプラズマの電流は50Ａ以上、150Ａ以下とすることが好ましい。
[Plasma torch speed: 200-600mm / min, plasma current: 50-150A]
For smooth and continuous melting, it is advantageous that the plasma torch speed is low and the plasma current is high. However, when the plasma torch speed is less than 200 mm or the plasma current is more than 150 A, the weld joint is deformed due to excessive melting, and the value of the member itself is lowered. On the other hand, when the plasma torch speed exceeds 600 mm / min or the plasma current is less than 50 A, the heat input of the plasma is insufficient and the remelted portion is likely to be discontinuous. Therefore, the plasma torch speed is preferably 200 mm / min or more and 600 mm / min or less, and the plasma current is preferably 50 A or more and 150 A or less.
〔自動車用シャシー部材のブラケットの取り付け溶接部〕
ここに、自動車用シャシー部材は、自動車の走行中の振動と操舵に伴う応力の繰り返しによって複雑な荷重変動を受ける。また、近年の車体軽量化を目的とした鋼板の薄厚、高張力化によって部材としての疲労強度が低下するため、自動車用シャシー部材は、その疲労強度向上が強く求められている。「自動車用シャシー部材」とは、例えば「サスペンションのアーム」または「サスペンションなどを支持するサブフレーム」などである。
[Mounting welds for brackets of automobile chassis members]
Here, the automobile chassis member is subjected to complicated load fluctuations due to vibrations during driving of the automobile and repetition of stress accompanying steering. In addition, since the fatigue strength as a member is reduced due to the reduction in thickness and tension of a steel plate for the purpose of reducing the weight of a vehicle body in recent years, an automobile chassis member is strongly required to improve its fatigue strength. The “automobile chassis member” is, for example, a “suspension arm” or a “subframe that supports the suspension”.
そこで、発明者らが破壊現象の解析と荷重試験を行った結果、サブフレームのブラケットの取り付け溶接部に対する応力の集中が最も大きく、疲労による破壊を生じやすいことが分かった。従って、上記溶接部に対し、本発明に従う溶接継手を適用することは、応力の集中を効果的に低減して、サブフレームのブラケットの取り付け溶接部の寿命をのばすために、好ましい実施形態である。 Thus, as a result of the analysis of the fracture phenomenon and the load test by the inventors, it has been found that the stress concentration on the welded portion of the subframe bracket mounting is the largest, and fatigue is likely to occur. Therefore, applying the welded joint according to the present invention to the weld is a preferred embodiment in order to effectively reduce stress concentration and extend the life of the subframe bracket attachment weld. .
表１に示す３種類の熱延鋼板を用いて、図５（a）に斜線で示すような隅肉溶接を行ない、溶接ビード３を形成した。溶接は、シールドガスとしてArにCO2と02とを混合したガスを用いMAG溶接で行った。次に、表２に示す条件により、溶接ビード３の止端部と鋼板とを溶融した。なお、表中、プラズマのトーチ先端と鋼材との距離をＬTとし、再溶融の中心の溶接ビード止端からの距離をＬCとした。また、プラズマガスは、Arに７vol％のH2を混合したガスを用いた。
得られた溶接継手の形状を表３に示す。
Using the three types of hot-rolled steel sheets shown in Table 1, fillet welding as shown by the oblique lines in FIG. Welding was performed by MAG welding using a gas in which CO 2 and 0 2 were mixed in Ar as a shielding gas. Next, the toe portion of the
Table 3 shows the shape of the obtained welded joint.
次に、図５（a）および（b）に示すような形状の疲労試験片を切り出して、疲労試験（装置：シェンク式、方法：平面曲げ片振り、周波数：20Hz、繰返し回数：最大1000万回）を、100〜400MPaで行ない、亀裂が生じたときの回数を測定し、繰返し回数が1000万回においても亀裂が生じなかった最高荷重を疲労限として評価した。なお、図５（b）中、６は補強溶接部である。
その結果を表３に併せて示す。
Next, a fatigue test piece having a shape as shown in FIGS. 5 (a) and 5 (b) was cut out, and a fatigue test (apparatus: Schenck type, method: plane bending piece swing, frequency: 20Hz, number of repetitions: maximum 10 million) No.) was performed at 100 to 400 MPa, the number of times when a crack occurred was measured, and the maximum load at which no crack occurred even when the number of repetitions was 10 million was evaluated as the fatigue limit. In addition, in FIG.5 (b), 6 is a reinforcement welding part.
The results are also shown in Table 3.
表３中の試験番号ｌ〜14（発明例）は、本発明の範囲を満足する例であり、一方、試験番号15（比較例）は未溶融処理材であり、本発明の範囲外である。また、試験番号16および17（比較例）は、再溶融部の形状が本発明の範囲外である。
前記した疲労試験を種々の応力で行い求めた疲労限は、発明例では250〜350MPaであったのに対して、比較例では200MPa以下であった。
従って、発明例は、比較例よりも、疲労特性が向上していることが確かめられた
Test numbers 1 to 14 (invention examples) in Table 3 are examples satisfying the scope of the present invention, while test number 15 (comparative example) is an unmelted material and is outside the scope of the present invention. . In Test Nos. 16 and 17 (Comparative Example), the shape of the remelted portion is outside the scope of the present invention.
The fatigue limit obtained by performing the above-described fatigue test with various stresses was 250 to 350 MPa in the invention example, whereas it was 200 MPa or less in the comparative example.
Therefore, it was confirmed that the inventive example had improved fatigue characteristics than the comparative example.
次に、図６に示したサブフレームを試作して実車を想定した9800kNから24500kNの繰り返し荷重試験を実施した。ブラケット溶接部の形状と亀裂発生回数を表４に示す。なお、図中、７はサブフレーム、８はブラケット溶接部および９はブラケットである。 Next, a repetitive load test from 9800 kN to 24500 kN was performed by prototyping the subframe shown in FIG. 6 and assuming an actual vehicle. Table 4 shows the shape of the bracket weld and the number of cracks. In the figure, 7 is a sub-frame, 8 is a bracket weld, and 9 is a bracket.
表４から明らかなように、試験番号18および19（発明例）では、亀裂発生回数が50万回以上であったのに対して、 試験番号20および21（比較例）は、20万回以下であった。従って、サブフレームの場合でも、本発明に従う発明例は、 比較例よりも、疲労特性が向上していることが確かめられた。
As is clear from Table 4,
本発明によれば、隅肉溶接の溶接継手の疲労特性を向上することができるので、自動車の軽量化等、産業上、格段に有利な効果を得ることができる。 According to the present invention, it is possible to improve the fatigue characteristics of fillet welded joints, and thus it is possible to obtain advantageous effects on the industry such as weight reduction of automobiles.
１ 主板
２ 上板
３ 溶接ビード
４ 溶接止端部
５ 再溶融部
６ 補強溶接部
７ サブフレーム
８ ブラケット溶接部
９ ブラケット
DESCRIPTION OF SYMBOLS 1
３．前記１に記載の溶接継手を形成するにあたり、鋼板を隅肉溶接したのち、溶接ビードの止端部を中心として溶接ビードと鋼板とを再溶融するに際し、再溶融の熱源としてプラズマを用いるものとし、該プラズマの電流：50〜150Ａ、該プラズマのトーチ先端と鋼材との距離：２〜５mm、該再溶融部の中心と溶接ビード止端部との距離：1.5mm以内および該プラズマトーチ速度：200〜600mm／分の条件で再溶融処理を行うことを特徴とする溶接継手の形成方法。 3. In forming the weld joint as described in 1 above, plasma is used as a heat source for remelting when the weld bead and the steel plate are remelted around the toe portion of the weld bead after the steel plate is fillet welded. The plasma current: 50 to 150 A, the distance between the plasma torch tip and the steel material: 2 to 5 mm, the distance between the center of the remelted portion and the weld bead toe: within 1.5 mm, and the plasma torch speed : A method for forming a welded joint, wherein the remelting process is performed under conditions of 200 to 600 mm / min.
Claims (3)
記
３≦Ｗ≦５ｔ ・・・（1）
２Ｈ≦Ｗ ・・・（2）
ここで ｔ（mm）：鋼板の板厚 This is a welded joint obtained by remelting a fillet welded steel plate with a thickness of 1.2 mm or more around the toe of the weld bead, where the width of the remelted portion between the weld bead and the steel plate is W A welded joint for steel plate, wherein W and H satisfy the following formulas (1) and (2), where (mm) and the apparent height of the remelted part is H (mm).
3 ≦ W ≦ 5t (1)
2H ≦ W (2)
Where t (mm): Steel plate thickness
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