JP4734513B2 - Butt weld deformation test specimen - Google Patents

Butt weld deformation test specimen Download PDF

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JP4734513B2
JP4734513B2 JP2005159040A JP2005159040A JP4734513B2 JP 4734513 B2 JP4734513 B2 JP 4734513B2 JP 2005159040 A JP2005159040 A JP 2005159040A JP 2005159040 A JP2005159040 A JP 2005159040A JP 4734513 B2 JP4734513 B2 JP 4734513B2
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test piece
weld
groove
welding
butt
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JP2006334604A (en
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幸太郎 猪瀬
孝昭 松岡
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IHI Corp
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Description

本発明は、突合わせ溶接変形実験試験片に係り、詳しくは、金属板の突合わせ溶接変形実験に好適な試験片に関する。   The present invention relates to a butt welding deformation experimental test piece, and more particularly to a test piece suitable for a butt welding deformation test of a metal plate.

造船、橋梁等の鋼構造物の分野では、鋼板の端縁同士を突き合わせて複数の鋼板を一体化させる突合わせ溶接が多用されており、これにより大型の鋼構造物を製造可能である。
このような大型の鋼構造物では、鋼板の突合わせ溶接後において構造物が十分な剛性、強度等を有していることが要求され、鋼板等の金属板、溶接材料及び溶接施工方法等に関し、予め対象となる金属板を突合わせ溶接した状態で性能評価しておくことが必要である。特に、突合わせ溶接後において板面が十分な平面度合いを有していることは重要であり、変形等を評価する突合わせ溶接変形実験の実施は不可欠である。 In the field of steel structures such as shipbuilding and bridges, butt welding is used in which a plurality of steel plates are integrated by abutting the edges of steel plates, whereby a large steel structure can be manufactured.
In such a large steel structure, it is required that the structure has sufficient rigidity, strength, etc. after butt welding of steel plates, and it relates to metal plates such as steel plates, welding materials, welding construction methods, etc. It is necessary to evaluate the performance in a state where the target metal plate is butt welded in advance. In particular, it is important that the plate surface has a sufficient flatness after butt welding, and it is indispensable to conduct a butt welding deformation experiment for evaluating deformation and the like.

突合わせ溶接変形実験としては、従来、金属の延べ板から切り出した一対の試験片の端縁同士を開先を形成して互いに突き合わせ、必要に応じて一対の試験片を一定姿勢に保持するべく突き合わせた端縁の両端同士をエンドタブを用いて仮止めしておき、この状態で突合わせ溶接を行い、部材全体の変形を評価する実験方法が一般的である（非特許文献１等参照）。
接合・溶接技術Ｑ＆Ａ１０００：株式会社産業技術サービスセンター刊（１９９９年８月１１日発行）−１０３頁〜１０４頁（図１）等 Conventionally, as a butt welding deformation experiment, the edges of a pair of test pieces cut out from a metal plate are formed with a groove, but they are brought into contact with each other, and if necessary, the pair of test pieces are held in a fixed posture. An experimental method is generally used in which both ends of the butted edges are temporarily fixed using end tabs, butt welding is performed in this state, and deformation of the entire member is evaluated (see Non-Patent Document 1, etc.).
Joining / welding technology Q & A 1000: published by Industrial Technology Service Center Co., Ltd. (issued on August 11, 1999)-pages 103-104 (Fig. 1), etc.

しかしながら、突合わせ溶接変形実験において上記のように一対の別々の試験片同士を突き合わせて溶接する場合、試験片の端縁間にずれ、即ち目違いが生じ易く、当該目違いの大きさは試験毎に異なり、同一試験条件下であっても試験データにばらつきが生じて定量的な評価を正確に行えないという問題がある。
また、突き合わせた端縁の両端同士をエンドタブを用いて仮止めする場合においては、一対の試験片同士を常時完全同一の位置関係に維持することは不可能であり、上記目違いに加えて初期不整が生じ、上記問題はさらに顕著である。 However, when a pair of separate test pieces are butt-welded as described above in a butt welding deformation experiment, misalignment between the edges of the test pieces, that is, misunderstanding is likely to occur. There is a problem that, even under the same test conditions, the test data varies and the quantitative evaluation cannot be performed accurately.
In addition, in the case where both ends of the abutted edges are temporarily fixed using end tabs, it is impossible to always maintain a pair of test pieces in exactly the same positional relationship. Imperfections occur and the above problems are even more pronounced.

この場合、例えば試験片を保持する治具の精度を高めることが考えられるが、治具の精度を高めることには限界があり、上記方法を行う限り、目違いや初期不整の影響を排除することは困難と言わざるを得ない。
本発明はこのような問題点を解決するためになされたもので、その目的とするところは、目違いや初期不整の影響を排除して定量的な評価を正確に実施可能な突合わせ溶接変形実験試験片を提供することにある。 In this case, for example, it is conceivable to increase the accuracy of the jig for holding the test piece, but there is a limit to increasing the accuracy of the jig, and as long as the above method is performed, the influence of misunderstandings and initial irregularities is eliminated. I have to say that it is difficult.
The present invention has been made to solve such problems, and the object of the present invention is to make a butt weld deformation that can accurately perform quantitative evaluation by eliminating the influence of misunderstandings and initial imperfections. It is to provide an experimental specimen.

上記した目的を達成するために、請求項１の突合わせ溶接変形実験試験片は、一枚の金属板からなる試験片本体と、該試験片本体の周縁から外方に向けて互いに離反するよう突出して設けられ、該試験片本体と連続して一体をなす一対のタブと、該一対のタブ及び前記試験片本体の一方の平面上に該一対のタブのうちの一方のタブの中心近傍から他方のタブの中心近傍まで直線状に延びて設けられ、Ｖ型開先を模擬した断面Ｖ字状の溶接溝とを備えたことを特徴とする。   In order to achieve the above-described object, the butt weld deformation experimental test piece according to claim 1 is separated from the test piece main body made of a single metal plate and outward from the periphery of the test piece main body. A pair of tabs provided so as to protrude and continuously integrated with the test piece main body, and from the vicinity of the center of one of the pair of tabs on one plane of the pair of tabs and the test piece main body A welding groove having a V-shaped cross section simulating a V-shaped groove is provided, extending linearly to the vicinity of the center of the other tab.

これより、Ｖ型開先を模擬した断面Ｖ字状の溶接溝にアーク溶接を行い、溶接溝の底部が溶融（メルトスルー）して溶接金属が形成されると、Ｖ型開先にアーク溶接を施工したと同様の結果が得られる。この場合、溶接を施した試験片は分離した試験片同士を突き合わせるようなものでなくもともと一体物であるので、試験片同士を突き合わせた場合に生じる目違いが排除される。また、溶接時に試験片同士を一定姿勢に保持するための一対のタブも別体でなく試験片本体と一体に形成されているので、別体のタブを仮止めする場合に生じる初期不整についても排除される。   From this, arc welding is performed on a V-shaped weld groove that simulates a V-shaped groove, and when the bottom of the weld groove is melted (melt-through) to form a weld metal, arc welding is performed on the V-shaped groove. The result is the same as the construction. In this case, the welded test piece is not an abutment of the separated test pieces, but is originally an integral part, so that the difference between the test pieces when they are brought together is eliminated. In addition, since the pair of tabs for holding the test pieces in a fixed posture during welding is formed integrally with the test piece main body instead of a separate body, initial irregularities that occur when temporarily fastening the separate tabs are also included. Eliminated.

請求項２の突合わせ溶接変形実験試験片では、請求項１において、前記溶接溝は、底部の最小肉厚が１mm以下であることを特徴とする。
このように溶接溝の底部の最小肉厚が１mm以下であると、確実に溶接溝の底部が溶融（メルトスルー）して溶接金属が形成されるとともに、試験片による溶接金属の希釈率の低減が図られる。 The butt weld deformation experimental test piece according to claim 2 is characterized in that, in claim 1, the weld groove has a minimum wall thickness of 1 mm or less.
Thus, when the minimum thickness of the bottom of the weld groove is 1 mm or less, the bottom of the weld groove is surely melted (melt-through) to form a weld metal, and the dilution rate of the weld metal by the test piece is reduced. Is planned.

請求項３の突合わせ溶接変形実験試験片では、請求項１または２において、前記溶接溝は、底部が内面角Ｒ加工されていることを特徴とする。
これにより、溶接溝の底部に溶融した溶接材料が良好に行き渡り、溶接溝の底部が確実に溶融（メルトスルー）して溶接金属が形成される。 The butt weld deformation experimental test piece according to claim 3 is characterized in that, in claim 1 or 2, the welding groove has an inner surface angle R processed at the bottom.
Thereby, the molten welding material spreads well at the bottom of the welding groove, and the bottom of the welding groove is reliably melted (melt-through) to form a weld metal.

請求項１の突合わせ溶接変形実験試験片によれば、Ｖ型開先を模擬した断面Ｖ字状の溶接溝にアーク溶接を行い、溶接溝の底部を溶融（メルトスルー）して溶接金属を形成することにより、Ｖ型開先にアーク溶接を施工したと同様の溶接状態を実現できる。そして、この場合、溶接を施した試験片はもともと一体物であるので、試験片同士を突き合わせた場合に生じる目違いの発生を排除することができ、また、溶接時に試験片同士を一定姿勢に保持するための一対のタブも別体でなく試験片本体と一体に形成されているので、別体のタブを仮止めする場合に生じる初期不整の発生についても排除することができる。   According to the butt welding deformation test specimen of claim 1, arc welding is performed on a V-shaped weld groove simulating a V-shaped groove, and the bottom of the weld groove is melted (melt-through) to form a weld metal. By forming, it is possible to realize a welding state similar to that when arc welding is applied to a V-shaped groove. In this case, since the welded test pieces are originally integral, it is possible to eliminate the occurrence of misunderstandings that occur when the test pieces are brought into contact with each other. Since the pair of tabs for holding are also formed integrally with the test piece main body, not separately, it is possible to eliminate the occurrence of initial irregularities that occur when temporarily fastening the separate tabs.

これにより、突合わせ溶接の変形実験において、目違いや初期不整の影響を排除して定量的な評価を正確に実施することができる。
請求項２の突合わせ溶接変形実験試験片によれば、溶接溝の底部の最小肉厚を１mm以下にすることにより、確実に溶接溝の底部を溶融（メルトスルー）させて溶接金属を形成させることができるとともに、試験片による溶接金属の希釈率の低減を図り、溶接品質の安定化を図ることができる。これにより、突合わせ溶接の変形実験における定量的な評価をより一層正確に実施することができる。 Thereby, in the deformation experiment of butt welding, it is possible to accurately perform quantitative evaluation by eliminating the influence of misunderstandings and initial irregularities.
According to the butt-weld deformation test specimen of claim 2, by making the minimum thickness of the bottom of the weld groove 1 mm or less, the bottom of the weld groove is surely melted (melt-through) to form a weld metal. In addition, the dilution rate of the weld metal by the test piece can be reduced, and the welding quality can be stabilized. Thereby, the quantitative evaluation in the deformation experiment of butt welding can be more accurately performed.

請求項３の突合わせ溶接変形実験試験片によれば、底部を内面角Ｒ加工することにより、溶接溝の底部に溶融した溶接材料を良好に行き渡らせ、溶接溝の底部をより一層確実に溶融（メルトスルー）させて溶接金属を形成させることができる。   According to the butt weld deformation experimental test piece of claim 3, the bottom of the weld groove is distributed more favorably by melting the welded material at the bottom of the weld groove by machining the inner corner angle R, thereby further reliably melting the bottom of the weld groove. (Melt-through) to form a weld metal.

以下、本発明の実施形態を添付図面に基づいて説明する。
図１には、本発明に係る突合わせ溶接変形実験試験片の上視図が示され、図２には、図１のＡ−Ａ線に沿う断面図が示されており、以下、これら図１、図２に基づき本発明に係る突合わせ溶接変形実験試験片の構造について説明する。
本実施形態において、本発明に係る突合わせ溶接変形実験試験片は、図１に示すように、長方形の鋼板（金属板）からなる試験片本体１と、当該試験片本体１と連続して一体をなすとともに当該試験片本体１の一対の長辺（周縁）から外方に向け互いに離反するよう突出する一対のタブ２、３とを備えている。なお、同図に示すように、一対のタブ２、３は例えば試験片本体１の中心線Ｘの延長上に形成されているが、これら一対のタブ２、３の位置は中心線Ｘの延長上に限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a top view of a butt welding deformation test specimen according to the present invention, and FIG. 2 shows a cross-sectional view taken along the line AA of FIG. The structure of the butt welding deformation test specimen according to the present invention will be described based on FIG. 1 and FIG.
In the present embodiment, the butt welding deformation experimental test piece according to the present invention is integrally formed with a test piece body 1 made of a rectangular steel plate (metal plate) and the test piece body 1 as shown in FIG. And a pair of tabs 2 and 3 protruding outward from the pair of long sides (peripheries) of the test piece main body 1. As shown in the figure, the pair of tabs 2 and 3 are formed, for example, on the extension of the center line X of the test piece main body 1, but the position of the pair of tabs 2 and 3 is an extension of the center line X. It is not limited to the above.

そして、該一対のタブ２、３及び試験片本体１の一方の平面上（図示の面）には、一方のタブ２の中心近傍から他方のタブ３の中心近傍まで直線状に延びるようにして、Ｖ型開先を模擬した断面Ｖ字状の溶接溝４が形成されている。
図２に示すように、断面Ｖ字状の溶接溝４は、底部５と試験片本体１の他方の平面との距離、即ち溶接溝４の最小肉厚が所定寸法Ｄ（例えば、０mmより大きく１mm以下）となるように設定されている。そして、当該底部５には、所定Ｒ（例えば、Ｒ１．５mm以上）の内面角Ｒ加工が施されている。なお、溶接溝４の開口寸法Ｗは、鋼板の板厚Ｔと開口角度θ（例えば、６０°〜９０°）とに応じて適宜設定される。 Then, on one plane (the surface shown in the figure) of the pair of tabs 2 and 3 and the test piece main body 1, it extends linearly from the vicinity of the center of one tab 2 to the vicinity of the center of the other tab 3. A weld groove 4 having a V-shaped cross section simulating a V-shaped groove is formed.
As shown in FIG. 2, the welding groove 4 having a V-shaped cross section has a distance between the bottom 5 and the other plane of the test piece body 1, that is, the minimum thickness of the welding groove 4 is larger than a predetermined dimension D (for example, greater than 0 mm). 1mm or less). The bottom portion 5 is subjected to an inner surface angle R processing of a predetermined R (for example, R 1.5 mm or more). The opening dimension W of the welding groove 4 is appropriately set according to the plate thickness T of the steel plate and the opening angle θ (for example, 60 ° to 90 °).

このように構成される突合わせ溶接変形実験試験片は、実際には、鋼板の延べ板から試験片本体１と一対のタブ２、３とを一体物として切り出し、当該一体物の一方の平面上に切削加工によりタブ２の中心近傍からタブ３の中心近傍まで断面Ｖ字状の溶接溝４を直線状に形成するようにして製造される。但し、製造工程については特に限定されるものではない。   The butt weld deformation experimental test piece constructed in this way is actually cut out from the steel plate as a single piece of the test piece main body 1 and the pair of tabs 2 and 3 on one plane of the single piece. Further, the welding groove 4 having a V-shaped cross section is formed in a straight line from the vicinity of the center of the tab 2 to the vicinity of the center of the tab 3 by cutting. However, the manufacturing process is not particularly limited.

以下、このように構成された本発明に係る突合わせ溶接変形実験試験片の作用について説明する。
突合わせ溶接変形実験においては、先ず、断面Ｖ字状の溶接溝４に沿ってアーク溶接を施工する。
このように溶接溝４に沿ってアーク溶接を行うと、溶接材料と溶接溝４周辺の鋼が溶融して溶接溝４内に溶接金属が充填される。このとき、溶接溝４の底部５は最小肉厚が所定寸法Ｄ（例えば、０mmより大きく１mm以下）となるように極力薄く設定され、さらには底部５が内面角Ｒ加工されているため、図３に溶接金属の断面を示すように、溶融した溶接材料が底部５に良好に行き渡り、当該底部５は完全に溶融して所謂メルトスルーの状態となる。 Hereinafter, the operation of the butt welding deformation test specimen configured as described above according to the present invention will be described.
In the butt welding deformation experiment, first, arc welding is performed along the welding groove 4 having a V-shaped cross section.
When arc welding is performed along the weld groove 4 in this manner, the welding material and the steel around the weld groove 4 are melted and the weld metal is filled in the weld groove 4. At this time, the bottom 5 of the weld groove 4 is set as thin as possible so that the minimum thickness is a predetermined dimension D (for example, greater than 0 mm and 1 mm or less). As shown in FIG. 3, a weld metal cross section satisfactorily spreads over the bottom portion 5, and the bottom portion 5 is completely melted into a so-called melt-through state.

底部５がメルトスルーの状態になると、一枚の試験片でありながら、一対の試験片の端縁同士を突き合わせて形成されるＶ型開先にアーク溶接を施工したと同様の溶接状態を実現することができる。
そして、溶接溝４内に充填された溶接金属が冷却したら、一対のタブ２、３を切り落とし、試験片本体１の一側１ａと他側１ｂとが純粋に溶接金属だけで接合された状態にする。即ち、一対のタブ２、３は、溶接時において試験片本体１の一側１ａと他側１ｂとを一定姿勢に保持しておくためのものであり、溶接施工後は必要がなくなるため、切り落とすようにする。なお、性能評価に影響がなければ一対のタブ２、３は切り落とさなくてもよい。 When the bottom part 5 is in a melt-through state, the same welding state as when arc welding is applied to a V-shaped groove formed by abutting the edges of a pair of test pieces is realized while being a single test piece. can do.
When the weld metal filled in the weld groove 4 is cooled, the pair of tabs 2 and 3 are cut off so that the one side 1a and the other side 1b of the test piece main body 1 are joined with purely the weld metal. To do. That is, the pair of tabs 2 and 3 are for holding the one side 1a and the other side 1b of the test piece main body 1 in a fixed posture at the time of welding. Like that. If the performance evaluation is not affected, the pair of tabs 2 and 3 may not be cut off.

このようにして溶接溝４への溶接が完了したら、試験片本体１についての性能評価を行う。性能評価項目としては、試験片本体１を複数方向から写真撮影して試験片本体１の全体的な変形を評価する三次元写真計測、試験片本体１の溶接部分回りの角変形を評価する角変形計測、試験片本体１の横方向での収縮を計測する横収縮計測等がある。
角変形計測については、具体的には、図４に示すように予め試験片本体１上に規定された測定点（○印）の位置（一平面からの距離）をダイヤルゲージ等を用いて計測して評価を行う。また、横収縮計測については、具体的には、やはり図４に示すように予め試験片本体１上に規定された測定点（△印）間距離を測定して評価を行う。なお、三次元写真計測、角変形計測、横収縮計測等における評価方法については公知であり、ここでは説明を省略する。 When the welding to the welding groove 4 is completed in this way, the performance evaluation of the test piece main body 1 is performed. As performance evaluation items, the specimen body 1 is photographed from a plurality of directions to measure the overall deformation of the specimen body 1 and the angular distortion around the welded portion of the specimen body 1 is evaluated. There are deformation measurement, lateral contraction measurement for measuring contraction of the test piece main body 1 in the lateral direction, and the like.
As for angular deformation measurement, specifically, as shown in FIG. 4, the position (distance from one plane) of a measurement point (marked with a circle) defined in advance on the test piece main body 1 is measured using a dial gauge or the like. And evaluate. Further, the lateral contraction measurement is specifically evaluated by measuring a distance between measurement points (Δ marks) defined in advance on the test piece main body 1 as shown in FIG. Note that evaluation methods in three-dimensional photo measurement, angular deformation measurement, lateral contraction measurement, and the like are known, and description thereof is omitted here.

このようにして性能評価を行うことになるが、本発明に係る突合わせ溶接変形実験試験片では、上述したように、試験片本体１及び一対のタブ２、３は溶接施工前にはもともと一枚の試験片からなる一体物である。
従って、性能評価を行うにあたり、試験片同士を突き合わせた場合に生じるずれ、即ち目違いの影響を確実に排除することができる。また、一対のタブ２、３についても別体でなく試験片本体１と一体に形成されているので、別体のタブを仮止めする場合に生じる初期不整の影響をも確実に排除することができる。これにより、突合わせ溶接の変形実験において、定量的な評価を正確に実施することができ、評価の信頼性を高めることができる。 In this way, the performance evaluation is performed. However, in the butt welding deformation test specimen according to the present invention, as described above, the specimen main body 1 and the pair of tabs 2 and 3 are originally one before welding. It is an integral body consisting of a single specimen.
Therefore, in performing the performance evaluation, it is possible to surely eliminate the deviation caused when the test pieces are brought into contact with each other, that is, the influence of the misunderstanding. Further, since the pair of tabs 2 and 3 are not formed separately but integrally formed with the test piece main body 1, it is possible to surely eliminate the influence of the initial irregularity that occurs when the separate tab is temporarily fixed. it can. Thereby, in the deformation experiment of butt welding, quantitative evaluation can be performed accurately and the reliability of the evaluation can be enhanced.

また、上述したように、溶接溝４の底部５は最小肉厚が薄いことから、メルトスルーの実現とともに鋼による溶接金属の希釈率の低減を図り、溶接品質の安定化をも図ることができる。これにより、上記定量的な評価をより一層正確に実施することができる。
また、性能評価を行うにあたり、例えば溶接施工前に溶接溝４近傍に熱電対を取り付けておき、溶接時における溶接溝４周りの温度変化を測定しておくのがよい。このようにすれば、部材の熱ひずみの影響等を考慮して上記評価の精度を高めることが可能である。 Further, as described above, since the bottom portion 5 of the weld groove 4 has a small minimum thickness, it is possible to achieve the melt-through and reduce the dilution rate of the weld metal with steel, thereby stabilizing the welding quality. . Thereby, the said quantitative evaluation can be implemented still more correctly.
Moreover, when performing performance evaluation, it is good to measure the temperature change around the welding groove 4 at the time of welding, for example, attaching a thermocouple to the welding groove 4 vicinity before welding construction. If it does in this way, it is possible to raise the precision of the above-mentioned evaluation in consideration of the influence etc. of the thermal strain of a member.

以上で本発明に係る実施形態の説明を終えるが、実施形態は上記に限られるものではなく、発明の趣旨を逸脱しない範囲で種々変形可能である。
例えば、上記実施形態では、試験片本体１及びタブ２、３を鋼板としたが、本発明は如何なる種類の金属板にも適用可能である。
また、上記実施形態では、長方形の試験片本体１を採用したが、これに限られず、試験片本体１の形状は方形、円形等如何なるものであってもよい。 Although the description of the embodiment according to the present invention is finished above, the embodiment is not limited to the above, and various modifications can be made without departing from the spirit of the invention.
For example, in the above embodiment, the test specimen main body 1 and the tabs 2 and 3 are steel plates, but the present invention is applicable to any kind of metal plate.
Moreover, in the said embodiment, although the rectangular test piece main body 1 was employ | adopted, it is not restricted to this, The shape of the test piece main body 1 may be what is square, circular, etc.

また、上記実施形態では、アーク溶接を施工する場合を例に説明したが、これに限られず、本発明は他の溶接方法（例えば、レーザー溶接等）に対しても同様に適用可能である。   Moreover, in the said embodiment, although the case where arc welding was constructed was demonstrated to the example, it is not restricted to this, This invention is applicable similarly to other welding methods (for example, laser welding etc.).

本発明に係る突合わせ溶接変形実験試験片の上視図である。It is a top view of the butt-weld deformation test specimen according to the present invention. 図１のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG. 溶接金属の断面を示す図である。It is a figure which shows the cross section of a weld metal. 角変形計測の測定点（○印）及び横収縮計測の測定点（△印）を示す図である。It is a figure which shows the measurement point ((circle) mark) of angular deformation measurement, and the measurement point ((triangle | delta)) of lateral contraction measurement.

符号の説明Explanation of symbols

１ 試験片本体
２、３ タブ
４ 溶接溝
５ 底部 1 Test piece body 2, 3 Tab 4 Weld groove 5 Bottom

Claims (3)

一枚の金属板からなる試験片本体と、
該試験片本体の周縁から外方に向けて互いに離反するよう突出して設けられ、該試験片本体と連続して一体をなす一対のタブと、
該一対のタブ及び前記試験片本体の一方の平面上に該一対のタブのうちの一方のタブの中心近傍から他方のタブの中心近傍まで直線状に延びて設けられ、Ｖ型開先を模擬した断面Ｖ字状の溶接溝と、
を備えたことを特徴とする突合わせ溶接変形実験試験片。 A test piece body made of a single metal plate;
A pair of tabs that are provided so as to be separated from each other outward from the periphery of the test piece body, and that are continuously integrated with the test piece body;
The pair of tabs and the test piece main body are provided on one plane so as to extend linearly from the vicinity of the center of one of the pair of tabs to the vicinity of the center of the other tab, simulating a V-shaped groove. A welded groove having a V-shaped cross section,
A butt-weld deformation test specimen characterized by comprising: 前記溶接溝は、底部の最小肉厚が１mm以下であることを特徴とする、請求項１記載の突合わせ溶接変形実験試験片。   The butt welding deformation test specimen according to claim 1, wherein the weld groove has a minimum wall thickness of 1 mm or less. 前記溶接溝は、底部が内面角Ｒ加工されていることを特徴とする、請求項１または２記載の突合わせ溶接変形実験試験片。   The butt weld deformation experimental test piece according to claim 1 or 2, wherein the weld groove has a bottom surface processed to have an inner corner angle R.
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