JPS6055236B2 - Repair welding method for non-ferrous alloys - Google Patents

Description

【発明の詳細な説明】 本発明は非鉄合金製物品の欠陥部を補修溶接する方法
に関し、特に該補修溶接において発生し易い割れや変形
を防止できる様に改善した非鉄合金の補修溶接方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repair welding of defective parts of non-ferrous alloy articles, and more particularly to a repair welding method for non-ferrous alloys that is improved so as to prevent cracking and deformation that are likely to occur during repair welding. It is.

従来、例えは非鉄合金の溶接母材に割れ、溶接不良、
オーバーラップ、ピット、ブローホール、スラグ巻込み
等の溶接欠陥個所が発見された時には、必要に応じてそ
の欠陥個所をはつつて除去し、その欠陥除去あとに再び
欠陥が発生しない様に配慮しながら山盛溶接を施こすい
わゆる補修溶接が行なわれている。Conventionally, for example, cracks in the welding base material of non-ferrous alloys, welding defects,
When welding defects such as overlaps, pits, blowholes, and slag entrainment are discovered, remove the defects by removing them as necessary, and take care to prevent the defects from occurring again after the defects are removed. However, so-called repair welding, in which welding is carried out using heap welding, is performed.

他方非鉄合金鋳物特にアルミニウム合金係、マグネシウ
ム合金系及び銅合金系鋳物等においては、表面欠陥、樹
脂状晶間収縮、ガスポロシテイ、亀裂、変形等の欠陥個
所を除去した後溶接によつて容易に補修することが行な
われている。 第１、２図は従来の非鉄合金鋳物の２つ
の山盛溶接方法を例示する説明図であつて、第１図は母
材Ｂの裏側まで貫通しない程度の欠陥部Ａをはつて母材
の裏側まで貫通しない開先部Ｃを設けた例を示し、第２
図は母材Ｂの裏まで達する欠陥部Ａをはつつて母材の裏
側まで貫通した開先部Ｃ’を設けた例を示している。On the other hand, nonferrous alloy castings, especially aluminum alloy, magnesium alloy, and copper alloy castings, can be easily repaired by welding after removing defects such as surface defects, resinous intercrystalline shrinkage, gas porosity, cracks, and deformation. things are being done. Figures 1 and 2 are explanatory diagrams illustrating two conventional heap welding methods for non-ferrous alloy castings, and Figure 1 shows the process of welding the base metal by cutting out a defect A that does not penetrate to the back side of the base metal B. An example is shown in which a groove C that does not penetrate to the back side is provided, and the second
The figure shows an example in which a groove portion C' that penetrates to the back side of the base material B is provided by cutting off a defective portion A that reaches the back side of the base material B.

即ち第１図では欠陥部Ａがさほど深くはなく母材Ｂを貫
通する程はつらくても補修可能な場合に用いられる補修
溶接方法であり、第２図は欠陥部Ａがかなり深くてはつ
り開先部Ｃ’が母材Ｂの表裏両面にまたがつており、例
えば埋め板や裏当材等を用いて補修溶接しなければなら
ない。しかるに非鉄合金は、加熱状態における周囲の拘
束が強いと概して割れやすく、又クレータ割れやミクロ
シユリンケージキヤビテイ等が発生しやすくしかも融点
が低いという特性を有している。非鉄合金中で最も需要
度の高いアルミニウム合金もマグネシウｌ、合金もこの
範鴫に属しているので山盛溶接条件の選定についてはか
なり慎重な配慮を払う必要がある。これらを母材として
第１図の様な開先部Ｃを設けようとする場合、欠陥部Ａ
を完全に除去する必要性からどうしてもはつり部分が増
える傾向になり、開先底部Ｄの厚さｄは一般にかなり薄
めになり勝ちである。その為開先部Ｃに山盛溶接を行な
つたときの溶接熱は肉厚方向へ十分逃げることができず
薄めの該開先底部Ｄに集中して高熱され−Ｃ局部的な過
熱保持状態となりこの部分が割れ開口応力に抗すること
ができなくなるので、この部分を中心として割れと変形
が発生することになる。即ち割れは開先底部Ｄの母材熱
影響部に端を発して裏面Ｅに割れとして現われたり、溶
接部境界に小さな割れとして現われ、場合によつては更
に小さな欠陥としてミクロシユリンケージ群を生じるこ
とがある。一方変形は開先部Ｃの裏面Ｅに現われ易く、
例えば第３図はその一例である。即ち図面は第１図の方
法に従つて補修溶接したときの変形例であるが、開先底
部Ｄの熱履歴（過熱後の収縮）によつて裏面Ｅ″の様な
凹みが発生している。今一つの方法がある第２図の場合
において貫通開先部Ｃ″を肉盛溶接て埋めて行くにあた
つては貫通開先部Ｃ″の底部を埋める必要がある為に開
先部Ｃ″の底部を第１層肉盛溶接で埋めていき、逐次貫
通部を小さくしていくが最終部では穴埋め溶接をしなけ
ればならず、この部分は凝固する時に開先部Ｃ″の周囲
からの強い拘束を受け且つ溶接熱の逃げる方向が周方向
に限られ更に第１層肉盛部自身の肉厚が小さいので割れ
やすい条件が重なつて肉盛溶接部又は母材Ｂとの境界等
に割れが生じる。In other words, Fig. 1 shows a repair welding method used when the defect A is not very deep and can be repaired even if it is difficult enough to penetrate the base metal B, whereas Fig. 2 shows a repair welding method used when the defect A is quite deep and can be repaired even if it is difficult to penetrate the base metal B. The tip C' spans both the front and back surfaces of the base metal B, and must be repaired and welded using, for example, a filling plate or a backing material. However, nonferrous alloys are generally prone to cracking if the surroundings are strongly restrained during heating, and are prone to crater cracking, microsyringe cavities, etc., and have a low melting point. Since aluminum alloys and magnesium alloys, which are most in demand among non-ferrous alloys, also belong to this category, it is necessary to pay very careful consideration to the selection of heap welding conditions. When trying to provide a groove C as shown in Fig. 1 using these as the base material, the defect A
The need to completely remove the groove tends to increase the number of chiseled parts, and the thickness d of the groove bottom D generally tends to be quite thin. Therefore, when welding is performed on the groove C, the welding heat cannot sufficiently escape in the thickness direction, and is concentrated at the thinner bottom D of the groove and becomes highly heated. -C Localized overheating state As this part becomes unable to resist the crack opening stress, cracking and deformation will occur around this part. In other words, cracks originate from the heat-affected zone of the base material at the bottom of the groove D and appear as cracks on the back surface E, or appear as small cracks at the weld boundary, and in some cases, micro-syringe groups occur as even smaller defects. Sometimes. On the other hand, deformation tends to appear on the back surface E of the groove C,
For example, FIG. 3 is an example. In other words, the drawing shows a modified example when repair welding was performed according to the method shown in Fig. 1, but a dent as shown on the back surface E'' has occurred due to the thermal history of the groove bottom D (shrinkage after overheating). .In the case of Fig. 2, where there is another method, when filling the through groove C'' by overlay welding, it is necessary to fill the bottom of the through groove C''. The bottom of the groove C'' is filled with the first layer of overlay welding, and the penetration part is made smaller one by one, but in the final part, fill welding must be performed, and when this part solidifies, it is removed from the periphery of the groove C''. The welding heat escape direction is limited to the circumferential direction, and the thickness of the first layer overlay itself is small, making it susceptible to cracking. Cracks occur.

又２層目以後の肉盛溶接については第１図に示した肉盛
法と同様の条件となるので、第１図に関して述べた様な
割れや変形に見舞われるという問題がある。即ち以上述
べた様に非鉄合金製物品の溶接や鋳造の手直しとして不
可欠な補修溶接において発生するこれらの割れや変形の
発生防止は、非鉄合金母材の活用の点から是非解決され
なければならない大きな課題であつた。Moreover, since the overlay welding of the second layer and subsequent layers is performed under the same conditions as the overlay method shown in FIG. 1, there is a problem in that cracking and deformation as described in connection with FIG. 1 occur. In other words, as mentioned above, prevention of cracking and deformation that occurs during repair welding, which is essential for reworking welding and casting of non-ferrous alloy products, is a major problem that must be solved from the perspective of utilizing non-ferrous alloy base materials. It was a challenge.

本発明は以上の様な事情に着眼してなされたものであつ
て、上記課題を解決すると共に非鉄合金の鋳造や溶接欠
陥等の補修溶接にあたつて肉盛り溶接部及びその周辺母
材に割れや変形が発生しない新規な非鉄合金の補修溶接
を提供しようとするものである。The present invention has been made in view of the above-mentioned circumstances, and it solves the above-mentioned problems and also provides a method for overlay welds and surrounding base metals when casting non-ferrous alloys or repairing welding defects. The purpose is to provide a new repair welding method for non-ferrous alloys that does not cause cracking or deformation.

即ち上記目的を達成し得た本発明の構成とは、非鉄合金
製物品の欠陥部をはつつて開先部を形成し補修溶接を行
なう方法であつて、開先部を肉盛溶接する前に前記欠陥
部位置に対応する母材の裏面側に前記開先部よりも広め
の肉盛溶接を施こすことを要旨とするものである。In other words, the configuration of the present invention that achieves the above object is a method for repair welding by removing a defective part of a non-ferrous alloy article and forming a groove, in which the groove is welded before overlay welding. The gist is to perform overlay welding wider than the groove portion on the back side of the base material corresponding to the defective portion position.

以下実施例を示す図面に基づいて本発明の構成および作
用効果を具体的に説明するが、下記実施例は一具体例に
すぎず、もとより前・後記の趣旨に徴して種々設計を変
更することは、いずれも本発明の技術範囲に含まれてい
る。The configuration and effects of the present invention will be explained below in detail based on the drawings showing the embodiments. However, the embodiments below are only one specific example, and the design may be modified in various ways in keeping with the spirit described above and below. All of these are included in the technical scope of the present invention.

第４図及び第５ａ，ｂ，ｃ図は本発明方法を例示する説
ＶＪ！Ｙ３，図てある。4 and 5a, b, c are illustrations of the method of the invention. Y3, illustrated.

第４図は欠陥部Ａを有する非鉄合金製母材Ｂに補修溶接
を施すに際して、前記従来の補修溶接方法の様に、欠陥
部Ａをはつつて開先部を形成し該開先部を肉盛溶接する
に先立つてまず欠陥部Ａの位置に対応する母材Ｂの裏面
Ｅ側に適当厚さの肉盛溶接１を行なつた状態を示してい
る。該肉盛溶接１を設けることは発明の最も重要なポイ
ントをなす工程であつて、詳細は後述するが肉盛溶接１
の広さは後で前記欠陥部Ａをはつり取つて設けられる開
先部Ｃを十分カバーできる広さが必要でありその位置も
該開先部の位置と対応させた位置でなければならない。
一方肉盛溶接１の形は欠陥部Ａのはつり形状に応じて種
々変化するが代表的な例として以下夫々丸形の場合につ
いて説明する。尚肉盛溶接１の形成ははつり前に行なう
のが放熱の均一性という観点から特に好まれる。第５ａ
，ｂ，ｃ図は第４図における欠陥部Ａの程度がさほど深
くなり、母材Ｂを貫通するほどはつらなくても補修可能
な場合の補修溶接方法の手順を示しており夫々第５ａ図
は欠陥部Ａをはつつて開先部Ｃを設けた状態、第５ｂ図
は該開先部Ｃに肉盛溶接２を行なつた状態及び第５ｃ図
は仕上がり状態を示している。第５図ａは裏面Ｅに肉盛
溶接１を施して第４図の状態にしてから母材Ｂの欠陥部
Ａをはつつて開先部Ｃ″を形成した状態を示す。この場
合欠陥部Ａが深くまで存在しておれは当然開先深さは大
きくなりそれに従つて開先底部Ｄの厚さｄは薄くなる。
前述した様に欠陥部Ａを充分はつり取つて完全に除去す
る必要性があるから、該開先底部Ｄの厚さｄは薄めにな
り勝ちであるが、本発明方法の場合既に裏面Ｅに厚さｅ
のしかも開先部Ｃよりも広めの肉盛溶接１が施されてい
る為開先底部Ｄの厚さは実質的にはｄ＋ｅとなりはつり
取られた欠陥部Ａに代つて開先底部Ｄの厚さが補充され
たのと同じことになつている。肉盛溶接１の厚さｅにつ
いては例えば８順程度の厚みの母材の場合、すくなくと
も２ｗｍ以上は必要であるが、１５Ｔｓｎ以上の厚さは
不要である（２くｅ＜１５）。ついで第５ｂ図に示す様
に開先部Ｃに溶接を行ない肉盛溶接２を設ける。そして
第５ｃ図の様に肉盛溶接１及び肉盛溶接２の不要部分を
削り落して母材Ｂの両面を仕上げる。本発明では予め欠
陥部Ａの位置に対応する母材Ｂの裏面Ｅに開先部Ｃより
も広めの肉盛り溶接１を施しておくことによつて開口底
部Ｄの厚さｄを実質的には肉盛り溶接１の厚さ１だけ厚
く構成している。FIG. 4 shows that when performing repair welding on a non-ferrous alloy base material B having a defect A, the defect A is removed to form a groove, as in the conventional repair welding method. A state is shown in which, prior to overlay welding, overlay welding 1 of an appropriate thickness is first performed on the back surface E side of base material B corresponding to the position of defective portion A. Providing the overlay weld 1 is the most important step of the invention, and the details will be described later, but the overlay weld 1
It is necessary that the area is large enough to cover the groove C which will be provided later by picking out the defective part A, and the position thereof must also correspond to the position of the groove.
On the other hand, the shape of the overlay weld 1 varies depending on the chiseled shape of the defective portion A, but as a typical example, a round shape will be described below. From the viewpoint of uniformity of heat radiation, it is particularly preferable to form the overlay weld 1 before chiseling. Chapter 5a
, b, and c show the procedure for a repair welding method when the degree of defect A in FIG. 4 is so deep that it can be repaired even if it is not hard enough to penetrate the base metal B, and FIG. 5a, respectively. 5b shows a state in which the defective portion A has been removed and a groove portion C has been provided, FIG. 5b shows a state in which overlay welding 2 has been performed on the groove portion C, and FIG. 5c shows a finished state. FIG. 5a shows a state in which overlay welding 1 is applied to the back surface E to obtain the state shown in FIG. If A is deep, the groove depth will naturally increase, and the thickness d of the groove bottom D will become thinner accordingly.
As mentioned above, since it is necessary to sufficiently pick up and completely remove the defective portion A, the thickness d of the groove bottom D tends to be thinner, but in the method of the present invention, the thickness d is already on the back surface E. Sae
Moreover, since the overlay welding 1 is wider than the groove C, the thickness of the groove bottom D is essentially d+e, and the thickness of the groove bottom D is replaced by the removed defect A. It has become the same thing as the Saga has been replenished. Regarding the thickness e of the overlay welding 1, for example, in the case of a base material having a thickness of about 8 or so, it is necessary to be at least 2wm or more, but a thickness of 15Tsn or more is not necessary (2xe<15). Next, as shown in FIG. 5b, welding is performed on the groove C to provide an overlay weld 2. Then, as shown in FIG. 5c, unnecessary portions of build-up welding 1 and build-up welding 2 are scraped off to finish both sides of base material B. In the present invention, the thickness d of the opening bottom part D can be substantially reduced by applying in advance a build-up weld 1 wider than the groove part C on the back surface E of the base material B corresponding to the position of the defective part A. is configured to be thicker by the thickness 1 of the build-up weld 1.

従つて開先部Ｃの肉盛り溶接２に伴なう溶接熱による開
先底部Ｄの局部加熱が起こらなくなつて割れ開口応力に
充分耐え得る為裏面Ｅには割れが発生しなくなり又開先
部Ｃと肉盛溶接２の溶接部境界にも小さな割れがなくな
ると共にミクロシユリンケージ群が発生することもなく
なつた。勿論第３図に示した様な裏面のへこみの発生や
母材Ｂの其の他の変形も皆無となつた。次に、第６ａ，
ｂ，ｃ図は本発明の他の方法を例示する説明図であつて
、第４図に示す欠陥部Ａがかなり深くて母材Ｂを貫通し
てはつる必要がある場合の補修溶接方法の手順を示して
おり、このケースでは欠陥部Ａのはつりに先立つて裏面
側の肉盛溶接１を形成する必要がある。Therefore, local heating of the groove bottom D due to the welding heat accompanying the overlay welding 2 of the groove C does not occur, and the crack opening stress can be sufficiently withstood, so no cracks occur on the back surface E, and the groove There were no small cracks at the weld boundary between part C and overlay weld 2, and no microscopic linkages were generated. Of course, there was no occurrence of any dents on the back surface as shown in FIG. 3, or any other deformation of the base material B. Next, 6th a,
Figures b and c are explanatory diagrams illustrating another method of the present invention, which is a repair welding method when the defect A shown in Figure 4 is quite deep and needs to be welded through the base metal B. In this case, it is necessary to form the overlay weld 1 on the back side before chipping out the defective part A.

即ち第６ａ図は欠陥部Ａをはつつて裏面Ｅまで貫通する
開先部Ｃ″を設けた状態、第６ｂ図は該開先部Ｃ″に肉
盛溶接３を行なつた状態及び第６図ｃ図は仕上がり状態
を示している。第６ａ図の開先部Ｃ″には第５ａ図に示
された様な開先底部Ｄは無いが、裏面Ｅの肉盛溶接１が
開先底部Ｄに相当すると共に、肉盛溶接１の厚さｅは実
質的には開先底部Ｄの厚さｄを形成することになつてい
る。That is, Fig. 6a shows a state in which a groove C'' is provided that penetrates through the defective part A to the back surface E, and Fig. 6b shows a state in which overlay welding 3 has been performed on the groove C'', and Figure c shows the finished state. Although the groove C″ in FIG. 6a does not have a groove bottom D as shown in FIG. 5a, the overlay weld 1 on the back surface E corresponds to the groove bottom D, and the overlay weld 1 The thickness e is intended to substantially form the thickness d of the groove bottom D.

この場合の肉盛溶接１の厚さｅは第？図の場合とほぼ同
程度か乃至は開先底部の無い分だけ余分な厚さを加えた
程度の厚さであればよい。ついで第６ｂ図に示す様に開
先部Ｃ″に溶接を行ない肉盛り溶接３を設ける。そして
第６ｃ図の様に肉盛り溶接１及び肉盛り溶接３の不要部
分を削り落して母材Ｂの両面を仕上げる。本発明ては予
め欠陥部Ａの位置に対応する母材Ｂの裏面に開先部Ｃ″
よりも広めの肉盛り溶接１を設けているので、肉盛溶接
３の溶接によつて貫通開先部Ｃ″を埋めて行く場合、該
肉盛り溶接１が開先底部Ｄの役割りを果して埋め板や裏
当金等の使用が不要であると共に肉盛溶接３が凝固する
時に溶接熱が周囲の母材Ｂの方向だけでなく該肉盛り溶
接１へも逃げ得る為肉盛溶接１に対する周囲からだけの
強い拘束力をやわらげることができて開先部Ｃ″と肉盛
り溶接３の溶接部境界に発生していた割れもなくなりミ
クロシユリンケージ群の発生することもなくなつた。勿
論第３図に示した様な裏面Ｅのへこみや母材Ｂの変形も
皆無となつた。次に本発明の実施例を揚げて本発明の効
果を更に詳述する。In this case, the thickness e of the overlay welding 1 is ?th? The thickness may be approximately the same as in the case shown in the figure or an extra thickness for the absence of the bottom of the groove. Next, as shown in Fig. 6b, welding is performed on the groove C'' to provide a built-up weld 3.Then, as shown in Fig. 6c, unnecessary portions of the built-up weld 1 and build-up weld 3 are scraped off to form the base metal B. In the present invention, a groove C'' is prepared in advance on the back surface of the base material B corresponding to the position of the defective part A.
Since the build-up weld 1 is provided wider than the build-up weld 1, when filling the through-groove portion C'' by welding the build-up weld 3, the build-up weld 1 plays the role of the groove bottom D. It is not necessary to use a filling plate or a backing metal, and when the overlay weld 3 solidifies, the welding heat can escape not only to the surrounding base material B but also to the overlay weld 1. It was possible to alleviate the strong restraining force exerted only from the surroundings, and the cracks that had occurred at the weld boundary between the groove C'' and the built-up weld 3 were eliminated, and the formation of micro-syringe groups was also eliminated. Of course, there were no dents on the back surface E or deformation of the base material B as shown in FIG. Next, the effects of the present invention will be explained in further detail by referring to Examples of the present invention.

実施例１ 溶加材としてＡ５ｌ８３−ＢＹ（２．４ｗｎφ又は４Ｔ
１ａφ）を用いたＡ５Ｏ８３Ｐ−０の溶接品（８ｍｔ）
を母材として第５ａ図に示す様な開先部を形成し交流Ｔ
ＩＧ手動溶接を行なつた。Example 1 A5l83-BY (2.4wnφ or 4T
A5O83P-0 welded product (8mt) using 1aφ)
A bevel as shown in Fig. 5a is formed using the base material, and an AC T is applied.
Performed IG manual welding.

本試験溶接では裏面の肉盛り溶接１の厚さｅと、開先深
さを種々変化させて９種類の試験を行なつた。第１表は
その試験条件と補修溶接実施後の結果を示す。 ゞゞ
ノ〜ＲＩ目ＶＪノ 第１表に示す仕上げ後の判定結果から、開先深さの大き
い（換言すれば開先底部Ｄの厚さｄが薄い）場合は裏面
の割れや裏面のへこみが発生しやすいこと、裏面の肉盛
り溶接を行なうと裏面の割れや裏面のへこみが全く無く
なること及び裏面の肉盛り厚さを約４Ｔｆｒ！ｎ施せば
裏面の割れやへこみの発生は完全に防止できるというこ
と等がわかつた。In this test welding, nine types of tests were conducted while varying the thickness e of the build-up weld 1 on the back surface and the groove depth. Table 1 shows the test conditions and the results after repair welding.ゞゞ
From the judgment results after finishing shown in Table 1 of No~RI VJ, when the groove depth is large (in other words, the thickness d of the groove bottom D is small), cracks and dents occur on the back side. It is easy to weld, there are no cracks or dents on the back side when welding on the back side, and the build-up thickness on the back side is about 4Tfr! It was found that cracks and dents on the back side can be completely prevented by applying n.

本発明の補修溶接方法は拘束力が強いと概して割れやす
い合金、クレータ割れを発生しやすい合金、ミクロシユ
リンケージキヤビテイを発生しやすい合金、融点の低い
合金などの非鉄合金等に対して有効であり中でもアルミ
ニウム合金、マグネシウム合金等に対してその効果が認
められ、この方法はこれらの非鉄合金の鋳物の補修に限
らず溶接欠陥補修にも適用てきる。The repair welding method of the present invention is effective for non-ferrous alloys such as alloys that are generally prone to cracking under strong binding force, alloys that are prone to crater cracking, alloys that are prone to microscopic linkage cavities, and alloys with low melting points. Among these, its effectiveness has been recognized for aluminum alloys, magnesium alloys, etc., and this method can be applied not only to repairing castings of these nonferrous alloys but also to repairing welding defects.

本発明の補修溶接方法は上記の様に行なわれるから補修
溶接によつて割れや変形を完全に防止できる非鉄合金の
汎用化に向けて貴重な功績を果すことがきた。Since the repair welding method of the present invention is carried out as described above, it has achieved valuable results in the development of general-purpose non-ferrous alloys that can completely prevent cracking and deformation by repair welding.

【図面の簡単な説明】[Brief explanation of the drawing]

第１，２図は従来の方法を例示する説明図、第３図は第
１図の方法による変形例を示す説明図、第４，５ａ，ｂ
，ｃ図は本発明方法を例示する説明図、第６ａ，ｂ，ｃ
図は本発明の他の方法を例示する説明図である。 Ａ・・・・・・欠陥部、Ｂ・・・・・・母材、Ｃ，Ｃ″
・・・・・・開先部、Ｄ・・・・・・開先底部、Ｅ・・
・・・・裏面、１，２，３・・・・・・肉盛溶接。Figures 1 and 2 are explanatory diagrams illustrating the conventional method, Figure 3 is an explanatory diagram illustrating a modification of the method in Figure 1, and Figures 4, 5a, and b.
, c are explanatory diagrams illustrating the method of the present invention, and Figs. 6a, b, c are
The figure is an explanatory diagram illustrating another method of the present invention. A...Defect part, B...Base material, C, C''
...... Groove section, D... Groove bottom, E...
...Back side, 1, 2, 3... Overlay welding.

Claims (1)

【特許請求の範囲】[Claims] １ 非鉄合金製物品の欠陥部をはつつて開先部を形成し
補修溶接を行なう方法であつて、開先部を肉盛溶接する
前に前記欠陥部位置に対応する母材の裏面側に前記開先
部よりも広めの肉盛溶接を施こすことを特徴とする非鉄
合金の補修溶接方法。1 A method of repair welding by punching out a defective part of a non-ferrous alloy article to form a groove, in which, before overlay welding the groove, a groove is formed on the back side of the base material corresponding to the position of the defect. A repair welding method for non-ferrous alloys, characterized by performing overlay welding that is wider than the groove.