JP3587944B2 - High frequency resistance welding method for plated steel sheet containing Al in plating layer - Google Patents
High frequency resistance welding method for plated steel sheet containing Al in plating layer Download PDFInfo
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- JP3587944B2 JP3587944B2 JP25090996A JP25090996A JP3587944B2 JP 3587944 B2 JP3587944 B2 JP 3587944B2 JP 25090996 A JP25090996 A JP 25090996A JP 25090996 A JP25090996 A JP 25090996A JP 3587944 B2 JP3587944 B2 JP 3587944B2
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【０００１】
【産業上の利用分野】
本発明は、Ｚｎ−Ａｌめっき鋼板，アルミめっき鋼板等のめっき層にＡｌを含むめっき鋼板の外観を損傷することなく、高周波抵抗溶接する方法に関する。
【０００２】
【従来の技術】
鋼管，軽量溶接形鋼等の構造材料を使用して構造体を構築する際、鋼管や形鋼を現場で組み立てた後、溶接している。溶接法としては、生産性及び作業能率を改善するために高周波抵抗溶接が多用されている。また、優れた耐久性が要求される場合には、防錆処理が施された構造材料が使用される。
耐久性を向上させるため、溶接後に防錆塗料を塗布する方法も採用されているが、このような方法では現場での作業工数が増加する。そこで、めっき鋼板等の素材を使用することが一般化されている。めっき鋼板としては、亜鉛めっき鋼板が代表的なものであるが、それ以外にもＡｌを含有するもの，たとえば５％Ａｌ含有亜鉛めっき鋼板や、亜鉛めっきより更に耐食性が優れたアルミめっき鋼板等が使用される。
【０００３】
【発明が解決しようとする課題】
通常の亜鉛めっき鋼板に関しては、鋼管，形鋼等を製造する技術が確立されている。他方、めっき層にＡｌを含むめっき鋼板については、板材としては一般的に利用されており、誘導コイルで加熱する高周波誘導溶接法で鋼管を製造することも知られている。しかしながら、形状による制約から誘導コイルで加熱できない構造用軽量溶接形鋼に関しては、めっき層にＡｌを含むめっき鋼板を素材とするものは未だ製品化されていない。
これは、高周波抵抗溶接によって製品表面の損傷，通電チップの損耗が激しくなることが原因である。すなわち、高周波抵抗溶接では、被溶接材料に接触させる通電チップの材質として一般的に銅系材料が使用されているが、めっき層にＡｌを含むめっき鋼板を被溶接材料とするとき、めっき層中のＡｌにより通電チップの先端に硬質で脆弱な合金層が形成され易くなる。この合金層は、剥離し易く、通電チップの損耗を著しく促進させる。また、合金層が剥離するとスパークが発生し、製品表面を損傷させる。
本発明は、このような問題を解消すべく案出されたものであり、物性が特定された材質の通電チップを使用することにより、めっき層表面の損傷や通電チップの損耗を抑制し、めっき層にＡｌを含むめっき鋼板の外観を損なうことなく高周波抵抗溶接することを目的とする。
【０００４】
【課題を解決するための手段】
本発明の高周波抵抗溶接方法は、その目的を達成するため、導電率が８０％ＩＡＣＳ以上で８００℃における強度が５ｋｇ／ｍｍ2以上の材質の通電チップをＡｌ含有めっき層で被覆されているめっき鋼板に直接接触させ、摺動させつつ高周波電流を供給してめっき鋼板を連続的に溶接することを特徴とする。
通電チップの材質としては、アルミナ分散銅が使用される。被溶接材料に対する通電チップの接触面積は、２００ｍｍ2以上が好ましい。
【０００５】
【作用】
通電チップの先端に生成する合金層は電極素材とめっき層との反応のし易さや電極の発熱に影響され、合金層の剥離に伴ったスパークの発生には合金層の厚み及び高温における電極材の変形抵抗が関与している。本発明者等は、合金層の生成及びスパークの発生について種々調査検討した結果、めっき層にＡｌを含むめっき鋼板を被溶接材料とするとき、導電率が８０％ＩＡＣＳ以上で８００℃における強度が５ｋｇ／ｍｍ２ 以上の材質でできた通電チップが最適であることを見い出した。なかでも、Ａｌとの反応性が低く、電気伝導度及び熱伝導度が高く高温強度に優れたアルミナ分散銅が優れたチップ材質である。形状としても被溶接材料に対する接触面積を２００ｍｍ２ 以上にすると、面圧が低下し、且つ単位面積当りの発熱量が減少するため、合金層の成長が抑制される。
【０００６】
【実施の形態】
本発明に従った高周波抵抗溶接では、図１，２に示すように、被溶接材料１であるめっき層にＡｌを含むめっき鋼板に通電チップ２を接触させ、通電チップ２を介して高周波電流３を被溶接材料１に供給することにより、被溶接材料１を発熱させて溶接する。このとき、接合面４も加熱されるが、被溶接材料１と通電チップ２との接触界面も加熱される。被溶接材料１の表面にあるめっき層は、融点が低いため、このときの加熱によって溶融し、通電チップ２の材質と合金化反応する。
Ａｌを含む合金層は、硬質で脆弱な相であるため、厚く成長すると割れ易い。この状態で通電チップ２が温度上昇によって軟化していると、通電チップ２と被溶接材料１との摺動により通電チップ２が変形すると共に合金層が破壊される。その結果、通電チップ２が損傷し、スパークの発生によって被溶接材料１の表面が損傷する。
【０００７】
この点、本発明で使用する通電チップ２は、導電性が良好な材質でできており、同時に熱伝導性も良好なため温度上昇しにくい。そのため、溶接時の温度で通電チップ２が軟化し難く、めっき層との合金化反応も抑制される。なかでも、材質がアルミナ分散銅である通電チップ２では、合金層の成長速度が遅く、一層良好な結果が得られる。接触面積が２００ｍｍ２ 以上の形状をもつ通電チップ２も、単位面積当りの入熱が相対的に小さくなって温度上昇が抑制され、しかも面圧が低下することから、同様に軟化し難く、めっき層との合金化反応も抑制される。
【０００８】
【実施例】
実施例１：
被溶接材料として、板厚４．５ｍｍ及び３．２ｍｍ，片面当りのめっき付着量９０ｇ／ｍｍ２ で、５重量％のＡｌを含む亜鉛めっき層が形成された溶融めっき鋼板を使用した。この被溶接材料をウエブ及びフランジとし、１５０ｍｍ×１００ｍｍの軽量溶接Ｈ形鋼を高周波抵抗溶接により製造した。通電チップ２として表１に掲げた各種の材質を使用し、電源の真空管プレート電流１４Ａ，電圧１４ＫＶ，ライン速度２０ｍ／分の条件下で溶接した。
溶接結果を示す表１にみられるように、本発明に従った溶接法では、８時間以上連続して溶接しても、通電チップに異常な損耗が発生せず、溶接製品も良好な外観を保っていた。また、同じアルミナ分散銅を通電チップの材質としてものでも、接触面積が大きな試験番号１では長時間使用後も電極の損耗が少なかったのに対し、接触面積が小さい試験番号３では電極が激しく損耗した。他方、導電率，８００℃での引張強さ，接触面積の何れか一つ又は複数が本発明で規定した条件を満足していない比較例では、スパークの発生，電極の損傷等が観察され、良好な結果が得られなかった。
【０００９】
実施例２：
被溶接材料として、板厚２．３ｍｍ，片面当りのめっき付着量６０ｇ／ｍｍ２ で、Ａｌめっき層が形成された溶融めっき鋼板を使用した。この被溶接材料をウエブ及びフランジとし、１００ｍｍ×１００ｍｍの軽量溶接Ｈ形鋼を高周波抵抗溶接により製造した。通電チップ２として表１に掲げた各種の材質を使用し、電源の真空管プレート電流１４Ａ，電圧１４ＫＶ，ライン速度２５ｍ／分の条件下で溶接した。
溶接結果を示す表２にみられるように、本発明に従った溶接法では、長時間連続して溶接しても、通電チップに異常な損耗が発生せず、比較例に比べて品質が著しく優れた溶接製品が得られた。この場合も、試験番号１と３との対比から、接触面積を大きくすることが通電チップの損耗抑制に有効なことが判る。
【００１１】
実施例３：
被溶接材料として、板厚４．５ｍｍ及び６ｍｍ，片面当りのめっき付着量１９０ｇ／ｍｍ２ で、０．２重量％のＡｌを含む亜鉛めっき層が形成された溶融めっき鋼板を使用した。この被溶接材料をウエブ及びフランジとし、２００ｍｍ×１００ｍｍの軽量溶接Ｈ形鋼を高周波抵抗溶接により製造した。通電チップ２として表１に掲げた各種の材質を使用し、電源の真空管プレート電流１４Ａ，電圧１４ＫＶ，ライン速度１５ｍ／分の条件下で溶接した。
溶接結果を示す表３にみられるように、本発明に従った溶接法では、長時間連続して溶接しても、通電チップに異常な損耗が発生せず、溶接製品も良好な外観を保っていた。他方、導電率，８００℃での引張強さ，接触面積の何れか一つ又は複数が本発明で規定した条件を満足していない比較例では、スパークの発生，電極の損傷等が観察された。この場合も、試験番号１と３との対比から、接触面積を大きくすることが通電チップの損耗抑制に有効なことが判る。
【００１３】
【発明の効果】
以上に説明したように、本発明においては、めっき層がＡｌを含むめっき鋼板を高周波抵抗溶接する際、導電率が８０％ＩＡＣＳ以上，８００℃での強度が５ｋｇ／ｍｍ２ 以上の材質の通電チップを使用することにより、溶接中に通電チップの過熱や高温変形を抑制すると共に、電極材質とめっき層との合金化反応を抑制している。そのため、低融点のめっき層が表面にあるめっき鋼板であっても、通電チップの寿命を長くした高周波溶接が可能となり、スパーク発生に起因した表面疵がなく良好な外観を呈する溶接製品が得られる。
【図面の簡単な説明】
【図１】めっき鋼板を使用して溶接Ｈ形鋼を高周波抵抗溶接するときの説明図
【図２】高周波抵抗溶接時に被溶接材料中を流れる電流の説明図
【符号の説明】
１：被溶接材料 ２：通電チップ ３：高周波電流 ４：接合面[0001]
[Industrial applications]
The present invention relates to a method for high-frequency resistance welding without damaging the appearance of a plated steel sheet containing Al in a plating layer such as a Zn—Al plated steel sheet or an aluminum plated steel sheet.
[0002]
[Prior art]
When constructing a structure using a structural material such as a steel pipe and a lightweight welded steel, the steel pipe and the shaped steel are assembled on site and then welded. As a welding method, high-frequency resistance welding is frequently used to improve productivity and work efficiency. Further, when excellent durability is required, a structural material subjected to a rust-proof treatment is used.
In order to improve the durability, a method of applying a rust preventive paint after welding is also adopted, but such a method increases the number of work steps on site. Therefore, it is common to use a material such as a plated steel sheet. A typical example of a galvanized steel sheet is a galvanized steel sheet. In addition, a galvanized steel sheet containing Al, for example, a 5% Al-containing galvanized steel sheet, an aluminum-coated steel sheet having more excellent corrosion resistance than zinc plating, and the like are also available. used.
[0003]
[Problems to be solved by the invention]
With respect to ordinary galvanized steel sheets, techniques for manufacturing steel pipes, section steels, and the like have been established. On the other hand, a plated steel sheet containing Al in a plating layer is generally used as a sheet material, and it is also known to manufacture a steel pipe by a high-frequency induction welding method of heating with an induction coil. However, regarding a structural lightweight welded steel that cannot be heated by an induction coil due to restrictions due to the shape, a product made of a plated steel sheet containing Al in a plating layer has not yet been commercialized.
This is because high-frequency resistance welding increases the damage on the product surface and the wear of the current-carrying tip. That is, in the high-frequency resistance welding, a copper-based material is generally used as a material of a current-carrying tip to be brought into contact with a material to be welded. Al makes it easy to form a hard and brittle alloy layer at the tip of the current-carrying chip. This alloy layer is easy to peel off and significantly promotes the wear of the current-carrying chip. Further, when the alloy layer peels off, sparks are generated, and the product surface is damaged.
The present invention has been devised to solve such a problem, and by using a current-carrying chip of a material whose physical properties are specified, it is possible to suppress damage to the plating layer surface and wear of the current-carrying chip, An object is to perform high-frequency resistance welding without impairing the appearance of a plated steel sheet containing Al in a layer.
[0004]
[Means for Solving the Problems]
In order to achieve the object, the high-frequency resistance welding method of the present invention is a plating method in which a current-carrying chip of a material having a conductivity of 80% IACS or more and a strength at 800 ° C. of 5 kg / mm 2 or more is covered with an Al-containing plating layer. The present invention is characterized in that a plated steel sheet is continuously welded by supplying a high-frequency current while making direct contact with the steel sheet and sliding the steel sheet.
Alumina-dispersed copper is used as the material of the current-carrying chip. The contact area of the current-carrying tip to the material to be welded is preferably 200 mm 2 or more.
[0005]
[Action]
The alloy layer formed at the tip of the current-carrying tip is affected by the ease with which the electrode material reacts with the plating layer and the heat generated by the electrodes. Deformation resistance is involved. The present inventors have conducted various investigations and studies on the formation of an alloy layer and the occurrence of sparks. As a result, when a plated steel sheet containing Al is used as a material to be welded, the strength at 800 ° C. is 80% IACS or more and the electrical conductivity is 80% IACS or more. It has been found that a current-carrying tip made of a material of 5 kg / mm 2 or more is optimal. Among them, alumina-dispersed copper, which has low reactivity with Al, high electrical conductivity and high thermal conductivity, and excellent high-temperature strength, is an excellent chip material. When the contact area with the material to be welded is 200 mm 2 or more, the surface pressure is reduced and the calorific value per unit area is reduced, so that the growth of the alloy layer is suppressed.
[0006]
Embodiment
In the high-frequency resistance welding according to the present invention, as shown in FIGS. 1 and 2, a current-carrying
Since the alloy layer containing Al is a hard and brittle phase, it tends to crack when grown thick. If the current-carrying
[0007]
In this regard, the current-carrying
[0008]
【Example】
Example 1
As a material to be welded, a hot-dip galvanized steel sheet having a thickness of 4.5 mm and 3.2 mm, a coating weight of 90 g / mm 2 on one side, and a galvanized layer containing 5% by weight of Al was formed. The material to be welded was used as a web and a flange, and a lightweight welded H-section steel of 150 mm × 100 mm was produced by high frequency resistance welding. Various materials listed in Table 1 were used as the current-
As can be seen from Table 1 showing the welding results, in the welding method according to the present invention, even if welding is continuously performed for 8 hours or more, abnormal wear does not occur in the current-carrying tip, and the welded product also has a good appearance. I was keeping it. In addition, even when the same alumina-dispersed copper was used as the material of the current-carrying chip, the electrode of Example No. 1 having a large contact area showed little loss of the electrode even after long-time use, whereas the electrode of Test No. 3 having a small contact area was severely worn. did. On the other hand, in a comparative example in which one or more of the electrical conductivity, the tensile strength at 800 ° C., and the contact area do not satisfy the conditions specified in the present invention, generation of sparks, damage to electrodes, and the like are observed. Good results were not obtained.
[0009]
Example 2:
As a material to be welded, a hot-dip coated steel sheet having a thickness of 2.3 mm and a coating weight per side of 60 g / mm 2 and having an Al plating layer formed thereon was used. The material to be welded was used as a web and a flange, and a 100 mm × 100 mm lightweight welded H-section steel was manufactured by high frequency resistance welding. Various materials listed in Table 1 were used as the current-carrying
As can be seen from Table 2 showing the welding results, in the welding method according to the present invention, even when welding was performed continuously for a long time, abnormal wear did not occur in the current-carrying tip, and the quality was remarkably higher than the comparative example. Excellent welding products were obtained. Also in this case, the comparison between Test Nos. 1 and 3 shows that increasing the contact area is effective in suppressing the wear of the current-carrying chip.
[0011]
Example 3
As a material to be welded, a hot-dip galvanized steel sheet having a thickness of 4.5 mm and 6 mm, a coating weight of 190 g / mm 2 per side, and a galvanized layer containing 0.2% by weight of Al was used. The material to be welded was used as a web and a flange, and a lightweight welded H-section steel of 200 mm x 100 mm was produced by high frequency resistance welding. Various materials listed in Table 1 were used as the current-carrying
As can be seen from Table 3 showing the welding results, in the welding method according to the present invention, even when welding is performed continuously for a long time, abnormal wear does not occur in the current-carrying tip, and the welded product maintains a good appearance. I was On the other hand, in a comparative example in which one or more of the conductivity, the tensile strength at 800 ° C., and the contact area did not satisfy the conditions specified in the present invention, generation of sparks, damage to electrodes, and the like were observed. . Also in this case, the comparison between Test Nos. 1 and 3 shows that increasing the contact area is effective in suppressing the wear of the current-carrying chip.
[0013]
【The invention's effect】
As described above, in the present invention, when high-frequency resistance welding is performed on a plated steel sheet in which the plated layer contains Al, the conductivity of a material having a conductivity of 80% IACS or more and a strength at 800 ° C. of 5 kg / mm 2 or more is measured. By using the tip, overheating and high-temperature deformation of the current-carrying tip during welding are suppressed, and an alloying reaction between the electrode material and the plating layer is suppressed. Therefore, even with a plated steel sheet having a plating layer with a low melting point on the surface, high-frequency welding with a long life of the current-carrying tip becomes possible, and a welded product having a good appearance without surface defects due to spark generation can be obtained. .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of high-frequency resistance welding of a welded H-section steel using a plated steel sheet. FIG. 2 is an explanatory diagram of a current flowing in a material to be welded during high-frequency resistance welding.
1: Material to be welded 2: Current carrying tip 3: High frequency current 4: Joining surface
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25090996A JP3587944B2 (en) | 1996-09-02 | 1996-09-02 | High frequency resistance welding method for plated steel sheet containing Al in plating layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25090996A JP3587944B2 (en) | 1996-09-02 | 1996-09-02 | High frequency resistance welding method for plated steel sheet containing Al in plating layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1076373A JPH1076373A (en) | 1998-03-24 |
| JP3587944B2 true JP3587944B2 (en) | 2004-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25090996A Expired - Fee Related JP3587944B2 (en) | 1996-09-02 | 1996-09-02 | High frequency resistance welding method for plated steel sheet containing Al in plating layer |
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| JP (1) | JP3587944B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010061454A1 (en) * | 2010-12-21 | 2012-06-21 | Thyssenkrupp Steel Europe Ag | High-frequency welding of sandwich panels |
| JP6551242B2 (en) * | 2016-01-12 | 2019-07-31 | 日本製鉄株式会社 | Feeding electrode for high frequency resistance welding of plated steel sheet |
| CN113814654A (en) * | 2021-08-20 | 2021-12-21 | 首钢集团有限公司 | Method for preparing hot forming part by using aluminum-containing coating hot forming plate |
-
1996
- 1996-09-02 JP JP25090996A patent/JP3587944B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH1076373A (en) | 1998-03-24 |
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