JP2005052858A - High-speed butt welding method of aluminum material - Google Patents
High-speed butt welding method of aluminum material Download PDFInfo
- Publication number
- JP2005052858A JP2005052858A JP2003285187A JP2003285187A JP2005052858A JP 2005052858 A JP2005052858 A JP 2005052858A JP 2003285187 A JP2003285187 A JP 2003285187A JP 2003285187 A JP2003285187 A JP 2003285187A JP 2005052858 A JP2005052858 A JP 2005052858A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- speed
- aluminum material
- rod
- butt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Arc Welding In General (AREA)
Abstract
Description
本発明は、アルミニウム材料の高速突合せ溶接方法に関し、特に突合せ部を連続的に溶接しつつ金属管を製管する際に好適なアルミニウム材料の高速突合せ溶接方法に関する。 The present invention relates to a high-speed butt welding method for aluminum materials, and more particularly, to a high-speed butt welding method for aluminum materials suitable for forming a metal pipe while continuously welding butt portions.
従来、金属管の内面を合成樹脂でライニングした金属複合管の製造方法としては種々のものがあるが、なかでも、例えば特許文献１に開示されるように、帯状金属板をその両側縁部を突き合わせ円筒状に成形し、その突き合わせ部を溶接等により互いに接合して金属管を連続的に製管しつつ、その内面に溶融樹脂を押し出すことによって被覆する方法は、あらかじめ金属管および樹脂管を製造して、金属管内に樹脂管を挿入して両者を接着剤で接合する等のバッチ式の製造方法等に比して、特に製造効率およびスペース効率の点で優れている。 Conventionally, there are various methods for producing a metal composite tube in which the inner surface of a metal tube is lined with a synthetic resin. Among them, as disclosed in, for example, Patent Document 1, both sides of the belt-like metal plate are provided. A method of forming a butt-cylindrical shape, joining the butt portions together by welding or the like and continuously forming a metal tube while extruding a molten resin on the inner surface of the metal tube and the resin tube in advance Compared to a batch-type manufacturing method such as manufacturing and inserting a resin tube into a metal tube and bonding them together with an adhesive, the manufacturing method and the space efficiency are particularly excellent.
ところで、このような連続製管による方法においては、金属としてアルミニウム材料が用いられ、溶接方法としてＴＩＧ溶接（タングステンイナートガスアーク溶接）が多用されるが、一般にアルミニウム材料におけるＴＩＧ溶接は、例えばＪＩＳ Ｚ３６０４−１９８５で規定されるイナートガスアーク溶接標準によれば、その溶接速度は１０〜１００ｃｍ／分とされるため、十分な製管速度が得られがたいものであった。このため、更に製管速度を向上することが可能な高速溶接方法が求められていた。 By the way, in such a continuous pipe manufacturing method, an aluminum material is used as a metal, and TIG welding (tungsten inert gas arc welding) is frequently used as a welding method. Generally, TIG welding in an aluminum material is, for example, JIS Z3604- According to the inert gas arc welding standard defined in 1985, since the welding speed is 10 to 100 cm / min, it is difficult to obtain a sufficient pipe making speed. For this reason, the high-speed welding method which can improve a pipe making speed further was calculated | required.
しかし、上記ＴＩＧ溶接においては、単に溶接速度を上げた場合、入熱不足による材料の溶け込み不足が生じやすくなる反面、熱量を上げすぎると入熱過大となって材料の溶け落ちやアンダーカットが生じやすくなるという問題があった。また、溶接時の電流が過小になると、アークのふらつきが生じやすくなる反面、電流を大きくし過ぎると溶接棒の劣化や消耗が促進されるという問題があった。 However, in the above TIG welding, if the welding speed is simply increased, insufficient material penetration due to insufficient heat input is likely to occur. On the other hand, if the amount of heat is increased too much, the heat input will be excessive and the material will melt and undercut. There was a problem that it became easier. Further, if the current during welding becomes too small, arc wobbling tends to occur, but if the current is too large, there is a problem that deterioration and wear of the welding rod are promoted.
本発明の目的は、上記従来の問題に鑑み、溶接速度を上げても材料の溶け込み不足や溶け落ちが発生し難く、また、アークのふらつき、溶接棒の劣化や消耗が発生し難い、アルミニウム材料の高速突合せ溶接方法を提供することにある。 In view of the above-described conventional problems, the object of the present invention is to prevent the material from being insufficiently melted or melted down even when the welding speed is increased, and to prevent arc wobbling, welding rod deterioration and wear, and aluminum materials. It is to provide a high-speed butt welding method.
請求項１記載のアルミニウム材料の高速突合せ溶接方法は、裏当て材を用いないアルミニウム材料の突合せＴＩＧ溶接において、棒径が２．０〜３．５ｍｍの溶接棒を用い、１７〜３２Ａ／ｍｍ2の電流密度で溶接することを特徴とする。 The high-speed butt welding method for aluminum material according to claim 1 uses a welding rod having a rod diameter of 2.0 to 3.5 mm in butt TIG welding of an aluminum material that does not use a backing material, and is 17 to 32 A / mm 2. It welds with the current density of.
請求項２記載のアルミニウム材料の高速突合せ溶接方法は、アルミニウム材料からなる帯状金属板をその両側縁部を突き合わせ円筒状に成形し、その突き合わせ部をＴＩＧ溶接により互いに接合して金属管を連続的に製管する際に用いられるアルミニウム材料の高速突合せ溶接方法であって、裏当て材を用いず、棒径が２．０〜３．５ｍｍの溶接棒を用い、１７〜３２Ａ／ｍｍ2の電流密度で溶接することを特徴とする。 The high-speed butt welding method for aluminum material according to claim 2 is a method in which a metal strip made of aluminum material is formed into a cylindrical shape with both side edges butt-joined and joined together by TIG welding. A high-speed butt welding method for aluminum materials used for pipe making, using a welding rod having a rod diameter of 2.0 to 3.5 mm without using a backing material, and a current of 17 to 32 A / mm 2 It is characterized by welding at a density.
以下、本発明を詳細に説明する。
本発明におけるアルミニウム材料としては、特に限定されず、アルミニウム金属、及びアルミニウム金属を主成分とするアルミニウム合金などが挙げられる。
Hereinafter, the present invention will be described in detail.
The aluminum material in the present invention is not particularly limited, and examples thereof include an aluminum metal and an aluminum alloy containing aluminum metal as a main component.
アルミニウム材料の厚みとしては、特に限定されないが、厚すぎると入熱不足の問題が起こりやすくなり、薄すぎると溶け落ちの問題が起こりやすくなるので、通常０．２ｍｍ〜１．７ｍｍとされる。 The thickness of the aluminum material is not particularly limited, but if it is too thick, a problem of insufficient heat input is likely to occur, and if it is too thin, a problem of melting through is likely to occur. Therefore, the thickness is usually 0.2 mm to 1.7 mm.
本発明における溶接棒の棒径は２．０〜３．５ｍｍとされる。棒径が２．４ｍｍに満たない場合には、高速で溶接した場合溶接棒の加熱損傷が起こりやすくなり、溶接不良が発生し易くなる。また、棒径が３．２ｍｍを超える場合には、溶接アークの集中性低下による入熱不足となり、溶接強度が不十分になることがある。 The rod diameter of the welding rod in the present invention is 2.0 to 3.5 mm. When the rod diameter is less than 2.4 mm, the welding rod is liable to be damaged by heating when it is welded at a high speed, resulting in poor welding. On the other hand, if the rod diameter exceeds 3.2 mm, the heat input is insufficient due to the reduced concentration of the welding arc, and the welding strength may be insufficient.
尚、本発明において「高速」とは、溶接速度５〜３０ｍ／分を意味する。 In the present invention, “high speed” means a welding speed of 5 to 30 m / min.
本発明における電流密度は１７〜３２Ａ／ｍｍ2とされる。ここで電流密度とは電流を溶接棒の断面積で除した値であり、電流密度が小さすぎると、高速で溶接した場合アークのふらつきが発生しやすくなることがある。また、電流密度が大きすぎると、溶接棒の劣化や摩耗が進行し易くなる傾向があり好ましくない。より好ましい範囲は２５〜２９Ａ／ｍｍ2である。 The current density in the present invention is 17 to 32 A / mm 2 . Here, the current density is a value obtained by dividing the current by the cross-sectional area of the welding rod. If the current density is too small, an arc wobbling is likely to occur when welding at high speed. On the other hand, if the current density is too large, the welding rod tends to deteriorate and wear easily, which is not preferable. A more preferable range is 25 to 29 A / mm 2 .
上記アルミニウム材料の高速突合せ溶接方法が、アルミニウム材料からなる帯状金属板をその両側縁部を突き合わせ円筒状に成形し、その突き合わせ部をＴＩＧ溶接により互いに接合して金属管を連続的に製管する際に用いられた場合には、裏当て材を用いる必要が無く、製管速度を大幅に向上し得る点で好ましい。
（作用）
The above-described high-speed butt welding method of aluminum material is a method of continuously forming a metal tube by forming a strip-shaped metal plate made of aluminum material into a cylindrical shape with both side edge portions being joined to each other by TIG welding. When used at the time, it is not necessary to use a backing material, which is preferable in that the pipe making speed can be greatly improved.
(Function)
一般に、アルミニウム材料の突合せ溶接は、その溶接条件が把握しにくく、その溶接速度の向上が困難であったが、本発明によれば、特定の範囲の棒径と電流密度を組み合わせることで、溶接速度の高速化が可能となり、溶接速度が５〜３０ｍ／分の溶接速度においても良好なＴＩＧ溶接が可能となるものである。 In general, butt welding of aluminum material, it is difficult to grasp the welding conditions, it was difficult to improve the welding speed, but according to the present invention, welding by combining a specific range of rod diameter and current density, The speed can be increased, and good TIG welding can be performed even at a welding speed of 5 to 30 m / min.
更に、本発明によれば、一般に裏当て材を用いることが困難な、突合せ部を連続的に溶接しつつ金属管を製管する際にも好適に用いることができ、製管速度を向上することができる。 Furthermore, according to the present invention, it is generally difficult to use a backing material, which can be suitably used when a metal pipe is made while continuously welding the butt portion, and the pipe making speed is improved. be able to.
本発明のアルミニウム材料の高速突合せ溶接方法は、裏当て材を用いないアルミニウム材料の突合せＴＩＧ溶接において、棒径が２．０〜３．５ｍｍの溶接棒を用い、１７〜３２Ａ／ｍｍ2の電流密度で溶接することを特徴とするので、溶接速度を上げても材料の溶け込み不足や溶け落ちが発生し難く、また、アークのふらつき、溶接棒の劣化や消耗が発生し難い、アルミニウム材料の高速突合せ溶接方法を提供することができる。 The aluminum material high-speed butt welding method of the present invention uses a welding rod having a rod diameter of 2.0 to 3.5 mm in a butt TIG welding of an aluminum material without using a backing material, and has a current of 17 to 32 A / mm 2 . Because it is welded at a high density, even if the welding speed is increased, it is difficult for the material to melt or melt, and it is difficult to cause arc wobbling, welding rod deterioration or wear. A butt welding method can be provided.
本発明のアルミニウム材料の高速突合せ溶接方法が、アルミニウム材料からなる帯状金属板の両側縁部を突き合わせ円筒状に成形し、その突き合わせ部をＴＩＧ溶接により互いに接合して金属管を連続的に製管する際に用いられる場合には、上記効果が発揮されることにより製管速度を大幅に向上することが可能となる。 The high-speed butt welding method for aluminum material according to the present invention is such that both side edges of a strip-shaped metal plate made of aluminum material are formed into a butt cylindrical shape, and the butt portions are joined to each other by TIG welding to continuously produce a metal tube. In the case of being used, the pipe making speed can be greatly improved by exhibiting the above effect.
以下に実施例および比較例を示すことにより、本発明を具体的に説明する。
尚、本発明は下記実施例のみに限定されるものではない。
The present invention will be specifically described below by showing examples and comparative examples.
In addition, this invention is not limited only to the following Example.
（実施例１）
アルミニウム材料（材質：ＪＩＳ Ｈ Ａ１１００Ｐ−Ｏ、厚み０．４５ｍｍ）製の帯状金属板を半円筒状に予備成形した後、その両側縁部を突合せ円筒状に成形し、その突合せ部を棒径３．２ｍｍの溶接棒を用い、電流密度が１７．４Ａ／ｍｍ2の条件のもとで１７ｍ／分の溶接速度で、裏当て材を用いずにＴＩＧ溶接し金属管を連続的に製管した。
(Example 1)
A band-shaped metal plate made of an aluminum material (material: JIS H A1100P-O, thickness 0.45 mm) is pre-formed into a semi-cylindrical shape, and then both side edges are formed into a butt-cylindrical shape. Using a 2 mm welding rod, a metal tube was continuously formed by TIG welding without using a backing material at a welding speed of 17 m / min under the condition of a current density of 17.4 A / mm 2 . .
（実施例２）
棒径２．４ｍｍの溶接棒を用い、電流密度を２２．０Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Example 2)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 22.0 A / mm 2 .
（実施例３）
棒径２．４ｍｍの溶接棒を用い、電流密度を２４．２Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Example 3)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 24.2 A / mm 2 .
（実施例４）
棒径２．４ｍｍの溶接棒を用い、電流密度を２６．４Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
Example 4
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 26.4 A / mm 2 .
（実施例５）
棒径２．４ｍｍの溶接棒を用い、電流密度を２８．６Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Example 5)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 28.6 A / mm 2 .
（実施例６）
棒径２．４ｍｍの溶接棒を用い、電流密度を３０．８Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Example 6)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 30.8 A / mm 2 .
（比較例１）
棒径３．２ｍｍの溶接棒を用い、電流密度を１３．６Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 1)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 3.2 mm was used and the current density was 13.6 A / mm 2 .
（比較例２）
棒径３．２ｍｍの溶接棒を用い、電流密度を１４．９Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 2)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 3.2 mm was used and the current density was 14.9 A / mm 2 .
（比較例３）
棒径３．２ｍｍの溶接棒を用い、電流密度を１６，１Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 3)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 3.2 mm was used and the current density was 16,1 A / mm 2 .
（比較例４）
棒径３．８ｍｍの溶接棒を用い、電流密度を２６．４Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 4)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 3.8 mm was used and the current density was 26.4 A / mm 2 .
（比較例５）
棒径２．４ｍｍの溶接棒を用い、電流密度を３３．２Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 5)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 2.4 mm was used and the current density was 33.2 A / mm 2 .
（比較例６）
棒径１．８ｍｍの溶接棒を用い、電流密度を２８．６Ａ／ｍｍ2としたこと以外は実施例１と同様にして金属管を連続的に製管した。
(Comparative Example 6)
A metal tube was continuously produced in the same manner as in Example 1 except that a welding rod having a rod diameter of 1.8 mm was used and the current density was 28.6 A / mm 2 .
上記実施例及び比較例について、以下の評価を行った。評価結果は表１に示した。
（溶接強度）
得られた金属管を用いて水圧破壊試験を行い以下の基準で溶接強度を評価した。
○：溶接部以外で破壊
×：溶接部破壊
（不良発生頻度）
実施例１〜６について、金属管の連続製管中１２時間当たりの溶接部における不良発生頻度を求めた。
The following evaluation was performed about the said Example and comparative example. The evaluation results are shown in Table 1.
(Welding strength)
A hydraulic fracture test was performed using the obtained metal pipe, and the welding strength was evaluated according to the following criteria.
○: Fracture other than welded part ×: Welded part destruction (frequency of defects)
About Examples 1-6, the defect frequency in the welding part per 12 hours was calculated | required during the continuous pipe manufacture of a metal pipe.
表１に示すように、本発明の実施例においては、１７ｍ／分の高速溶接においても、不良発生頻度が極めて小さく、また、十分な溶接部強度を有することが判明した。
As shown in Table 1, in the examples of the present invention, it was found that even in high-speed welding at 17 m / min, the frequency of occurrence of defects was extremely small and the weld strength was sufficient.
Claims (2)
High-speed butt welding of aluminum material used when continuously forming a metal tube by forming a strip-shaped metal plate made of aluminum material into a cylindrical shape with both side edges butted together by TIG welding A high-speed butt-matching of aluminum materials, characterized by using a welding rod having a rod diameter of 2.0 to 3.5 mm without using a backing material and welding at a current density of 17 to 32 A / mm 2 Welding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003285187A JP2005052858A (en) | 2003-08-01 | 2003-08-01 | High-speed butt welding method of aluminum material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003285187A JP2005052858A (en) | 2003-08-01 | 2003-08-01 | High-speed butt welding method of aluminum material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2005052858A true JP2005052858A (en) | 2005-03-03 |
Family
ID=34364898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003285187A Withdrawn JP2005052858A (en) | 2003-08-01 | 2003-08-01 | High-speed butt welding method of aluminum material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2005052858A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100997511B1 (en) | 2008-06-19 | 2010-12-06 | 알메탈주식회사 | Welding method for organic photo conductor drum and welding product thereof |
| CN102837115A (en) * | 2012-09-27 | 2012-12-26 | 中国化学工程第三建设有限公司 | Seamless welding method for aluminum and aluminum alloy or pipeline |
| CN104439641A (en) * | 2014-11-27 | 2015-03-25 | 芜湖中集瑞江汽车有限公司 | Aluminum plate welding process |
| CN104475938A (en) * | 2014-11-27 | 2015-04-01 | 芜湖中集瑞江汽车有限公司 | 10-12mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process |
| CN104493339A (en) * | 2014-11-27 | 2015-04-08 | 芜湖中集瑞江汽车有限公司 | TIG (tungsten inert gas) welding process of 12 to 14mm thick aluminum and aluminum alloys |
| CN104526128A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | Tungsten electrode inert gas shielded welding process of aluminum plate |
| CN104526126A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | TIG (tungsten inert gas) welding process of aluminum with thickness of 14-16mm and alloy thereof |
| CN104526121A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | Aluminum and aluminum alloy inert-gas shielded welding process suitable for plates of 12 mm thickness |
-
2003
- 2003-08-01 JP JP2003285187A patent/JP2005052858A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100997511B1 (en) | 2008-06-19 | 2010-12-06 | 알메탈주식회사 | Welding method for organic photo conductor drum and welding product thereof |
| CN102837115A (en) * | 2012-09-27 | 2012-12-26 | 中国化学工程第三建设有限公司 | Seamless welding method for aluminum and aluminum alloy or pipeline |
| CN104439641A (en) * | 2014-11-27 | 2015-03-25 | 芜湖中集瑞江汽车有限公司 | Aluminum plate welding process |
| CN104475938A (en) * | 2014-11-27 | 2015-04-01 | 芜湖中集瑞江汽车有限公司 | 10-12mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process |
| CN104493339A (en) * | 2014-11-27 | 2015-04-08 | 芜湖中集瑞江汽车有限公司 | TIG (tungsten inert gas) welding process of 12 to 14mm thick aluminum and aluminum alloys |
| CN104526128A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | Tungsten electrode inert gas shielded welding process of aluminum plate |
| CN104526126A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | TIG (tungsten inert gas) welding process of aluminum with thickness of 14-16mm and alloy thereof |
| CN104526121A (en) * | 2014-11-27 | 2015-04-22 | 芜湖中集瑞江汽车有限公司 | Aluminum and aluminum alloy inert-gas shielded welding process suitable for plates of 12 mm thickness |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5283306B2 (en) | Submerged arc welding method for steel | |
| JP5024475B1 (en) | Laser welded steel pipe manufacturing method | |
| JP4686289B2 (en) | Friction stir welding method for hollow workpieces | |
| JP4256879B2 (en) | Method of joining iron-based material and aluminum-based material and joint | |
| JP2010253511A (en) | Method of welding circumference of fixed steel pipe | |
| JP2005052858A (en) | High-speed butt welding method of aluminum material | |
| JP2009214127A (en) | Submerged arc welding method for steel material | |
| JP5866790B2 (en) | Laser welded steel pipe manufacturing method | |
| JP4978121B2 (en) | Butt joining method of metal plates | |
| JP2009233679A (en) | Submerged arc welding method of steel material | |
| JPH08243754A (en) | Inner face welding method of clad steel tube | |
| JP2010172896A (en) | Multi-electrode submerged arc welding method of steel material | |
| JP3992592B2 (en) | Method for producing welded joint made of dissimilar metals | |
| JP2005279744A (en) | Butt welding method of different kind of material using high energy beam | |
| JP5803160B2 (en) | Laser welded steel pipe manufacturing method | |
| JP3182672B2 (en) | Internal welding method of clad steel pipe | |
| JP2010274276A (en) | Submerged arc welding method for steel material | |
| JPH0857642A (en) | Manufacture of welded steel tube | |
| JP2011101891A (en) | Joining method | |
| JPH08276273A (en) | Butt welding method for clad steel | |
| JP2010274275A (en) | Submerged arc welding method for steel material | |
| JP4128022B2 (en) | Groove butt welding method using insert member and insert member used therefor | |
| KR102597063B1 (en) | Clad pipe producting method using pulse wavedorm overlay welding | |
| JPH07256456A (en) | One-side submerged arc welding | |
| JP2005271016A (en) | Friction welding method of steel tube and aluminum alloy hollow member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060518 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071207 |
|
| A131 | Notification of reasons for refusal |
Effective date: 20071219 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
|
| A761 | Written withdrawal of application |
Effective date: 20080128 Free format text: JAPANESE INTERMEDIATE CODE: A761 |