JPS6356365A - Welding method for galvanized steel sheet - Google Patents
Welding method for galvanized steel sheetInfo
- Publication number
- JPS6356365A JPS6356365A JP19945486A JP19945486A JPS6356365A JP S6356365 A JPS6356365 A JP S6356365A JP 19945486 A JP19945486 A JP 19945486A JP 19945486 A JP19945486 A JP 19945486A JP S6356365 A JPS6356365 A JP S6356365A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- galvanized steel
- composition
- component
- gas
- 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.)
- Granted
Links
- 238000003466 welding Methods 0.000 title claims abstract description 30
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 15
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 11
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000011324 bead Substances 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 9
- 239000011701 zinc Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 101000617550 Dictyostelium discoideum Presenilin-A Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
Description
発明の目的
［産業上の利用分野］
本発明は、亜鉛メッキ鋼板の溶接方法の改良に関する。
ここで、「亜鉛メッキ鋼板」とは、亜鉛メッキのほか亜
鉛を主材とする塗装を施した鋼板を包含する、亜鉛被覆
鋼材を意味する。OBJECT OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for welding galvanized steel sheets. Here, the term "galvanized steel sheet" refers to zinc-coated steel materials, including steel sheets coated with zinc-based coatings in addition to galvanizing.
亜鉛メッキ鋼叛は、たとえば自動車部品の防錆対策とし
て広く採用されつつあり、それに伴って溶接技術が重要
さを増している。
従来、亜鉛メッキ鋼板の溶接はガスシールドアーク溶接
によって行なわれているが、表面のＺｎ層が溶接の熱に
より気化して、多数のブローホールを発生させたり、シ
ールドガス雰囲気を乱してアークを不安定化し、スパッ
タを増大させ、ビード外観を不良にするといった問題が
ある。 Ｚｎ層を機械的に切削除去したり、ガス炎で焼
きとばすといった対策もとられているが、こうした前処
理の必要は、当然に生産性を下げコス１〜を高り１−る
ので、できれば行なわないで済ませたい。
しかし、Ｚｎ層が存在するまま溶接をする技術は、これ
まで満足できるものがなかった。 シールドガス組成の
観点からの改善策として、特開昭５７−２０９７７８号
公報には、１〜５％の酸素を含有するアルゴンの使用が
提案されている。
これは、発生したＺｎ蒸気を酸素で酸化して固体化する
ことにより、シールドガス雰囲気の撹乱を防ぐものであ
って、アークの安定化やビート形状の改善には役立つが
、ブローホールの発生を防止する効果は乏しい。
［発明が解決しようとする問題点］
本発明の目的は、上述のような状況を打開して、亜鉛メ
ッキ鋼板を、表面の７ｎ層を除去する前処理なしに溶接
して、安定なアークの下にスパッタ発生を低減し、ブロ
ーホールやピッ１〜のような欠陥が少なく、かつヒート
外観良好な溶接部が得られる溶接方法を提供することに
ある。
発明の構成
［問題点を解決するための手段］
本発明の亜鉛メッキ鋼板の溶接方法は、ガスシールドア
ーク溶接において、Ｃ：Ｏ，’１５％以下、Ｓｉ ：
０．３〜’１．Ｏ％、Ｍｎ ：０．７〜１．８％および
Ｔｉ ：０．００５〜０．６０％を含有し、Ｐ：０．
０２％以下、Ｓ：０．０３％以下であり、残部が実質的
にＦｅからなる組成の鋼ワイヤを使用し、かつＡｒ ±
（３〜１８）％ＣＯ２の組成のシールドカスを使用して
、パルスマグ溶接により実施することを特徴とする。
鋼ワイヤは、上記組成において、Ｓ：０．０１５〜０．
０３０％を含有するものが好ましい。
［作 用］
本発明者らは、前記の目的を達成できる溶接技術を確立
ずべく研究し、溶接法、ワイヤ組成およびシールドガス
組成の三者について総合的に調査した。 その成果とし
て得られたのが、上記の諸条件、すなわちパルスマグ溶
接の採用、特定のワイヤ組成おＪ：びシールドガス組成
の選択である。
ワイヤ組成およびシールドガス組成の限定理由は、つき
のとおりである。
Ｃ：０．１５％以下
亜鉛メッキ鋼板の溶接部にはあまり強度が要求されず、
むしろ靭性を高く保ちたいので、Ｃは少量に抑える。
上限０．１５％は、この観点から定めた。
Ｓｉ：０．３〜１．０％
Ｍｎ ：０．７〜１．８％
いずれも脱酸剤であって、不足すると脱酸不良に起因す
るブローホール発生を（ｔ（りので、それぞれ上記の下
限値以上に添加する。 −方、多量に過ぎるとビート形
状か不良になるので、やはりそれぞれの上限値以下にす
る。
Ｔｉ ：０．００５〜０．６０％
Ｔｉは、ブローホールとくにピットの低減に有効である
ことがわかった。 この効果は、０．００５％の少量か
ら認められる。 しかし、多量になるとスパッタが増加
し、かつビード形状も悪くなるので、０．６０％の上限
を設けた。
Ｐ：０．０２％以下
溶接割れの防止のため、少ないほどよい。
許容できる限界が０．０２％である。
Ｓ：０．０３％以下、好ましくは０．０１５〜０．０３
％
Ｐと同様に溶接割れの原因となるので、０゜０３％を超
えて存在してはならない。 ところが、Ｓは、Ｔｉ と
あいまってブローホールの発生防止に寄与するので、０
．０１５％以上存在する方が、むしろ好ましいといえる
。
シールドカス組成：Ａｒ ＋（３〜１８）％ＣＯ２従来
はＡｒ＋２０％ＣＯ２が代表的であったが、上記組成の
ワイヤを使用してパルスマグ溶接を行なう場合には、Ｃ
Ｏ２を少な目にした方が、ブローホールの減少、スパッ
タの低減のためによく、１８％止まりにすべきことがわ
かった。 ただし、３％を下回ると、かえってブローホ
ールとくにピットが増大する。
［実施例］
第１表に示す組成の鋼を圧延および伸線して、＝ ６−
径１．２＃のワイヤを製造した。 Ａ〜１〕が本発明の
範囲内にあり、＊印を付したＥ〜１−１は範囲外の組成
のものである。
第 １ 表
ＵＣ鉦歴几ＰＳ
Ａ Ｏ，０４０，３６０，７７０，１４０，００８０，
００６Ｂ Ｏ，０８０，３５１，７３０，３２０，０１
００，０２８ＣＯ，０５０，９４０，７６０，０６０，
００７０，００９Ｄ Ｏ，０４０，９５１，７５０，５
６０，０１１０，００４Ｅ＊ ０．０５ ０．
６１ １．３８＜Ｏ，０Ｏ１０，９０９０，０１２Ｆ
＊ ０．０６０．６３１．３５０．６８０．０１２０．
００８Ｇ＊ ０．０５０．２Ｂ ０．６７０．０Ｂ ０
．００９０．０１０Ｈ＊ ０．０６ １．０８ １．
８７ ０．１０ ０．０１３ ０．０１３上記のワイヤ
を使用して、つぎの溶接条イ′１で亜鉛メッキ鋼板のガ
スシールドアーク溶接を行なった。
シールドガス流量： ２０．１） ／ｍｉｎパルス条件
：
ピーク電流 パルス幅 ベース電流
ａ−４，２０Δ １．２ｍ５ｅｃ ３０Ａｂ・５
２０Ａ ０．６ｍ５ｅｃ ３０Ａ溶接電流：１
８０〜２０ＯＡ
母 祠 ：厚ざ２．３ｍｍ、４５／４５目付の両面亜鉛
メッキ鋼板
継手形状：重ね隅肉形状、ギャップなし溶接長さ：２５
０ｍ
全溶接長さにわたり、ピット、ブローホールの数をかぞ
え、ビード形状を評価するとともに、スパッタの多少を
記録した。 その結果を、溶接条件とともに、第２表に
示す。 Ｎｏ、 １〜６が本発明の実施例であり、Ｎｏ
、 ７ ＊〜１２＊が比較例である。
発明の効果
本発明の溶接方法によるときは、亜鉛メッキ鋼板のガス
シールドアーク溶接を、７０層除去の前処理なしに実施
しても、ブローホールは僅少であり、ピットは実質上ゼ
ロになり、しかもピード形状のよい溶接部が得られ、ス
パッタも軽減する。Galvanized steel is being widely adopted, for example, as a rust prevention measure for automobile parts, and welding technology is becoming increasingly important. Conventionally, galvanized steel sheets are welded by gas-shielded arc welding, but the Zn layer on the surface evaporates due to the heat of welding, creating many blowholes and disturbing the shielding gas atmosphere, causing arc welding. There are problems such as instability, increased spatter, and poor bead appearance. Countermeasures such as mechanically cutting away the Zn layer or burning it off with a gas flame have been taken, but the need for such pretreatment naturally reduces productivity and increases costs, so it is preferable to I want to get away with not having to do it. However, until now there has been no satisfactory technique for welding with the Zn layer still present. As an improvement measure from the viewpoint of shielding gas composition, Japanese Patent Application Laid-Open No. 57-209778 proposes the use of argon containing 1 to 5% oxygen. This prevents disturbance of the shielding gas atmosphere by oxidizing the generated Zn vapor with oxygen and solidifying it. This is useful for stabilizing the arc and improving the beat shape, but it also prevents the generation of blowholes. There is little effect in preventing it. [Problems to be Solved by the Invention] The purpose of the present invention is to overcome the above-mentioned situation and to weld galvanized steel sheets without pre-treatment to remove the 7n layer on the surface, thereby achieving a stable arc. It is an object of the present invention to provide a welding method that can reduce the occurrence of spatter on the bottom, have few defects such as blowholes and pits, and obtain a welded part with a good heat appearance. Composition of the Invention [Means for Solving the Problems] The method for welding galvanized steel sheets of the present invention uses gas-shielded arc welding to reduce C:O, not more than 15%, Si:
0.3~'1. O%, Mn: 0.7-1.8% and Ti: 0.005-0.60%, P: 0.
0.02% or less, S: 0.03% or less, and the remainder is substantially Fe, and Ar ±
It is characterized in that it is carried out by pulsed MAG welding using shielding scum with a composition of (3 to 18)% CO2. In the above composition, the steel wire has S: 0.015 to 0.015.
Those containing 0.030% are preferred. [Function] The present inventors conducted research to establish a welding technique capable of achieving the above object, and comprehensively investigated three factors: welding method, wire composition, and shielding gas composition. The results were the above-mentioned conditions, namely the adoption of pulsed MAG welding and the selection of a specific wire composition and shielding gas composition. The reasons for limiting the wire composition and shielding gas composition are as follows. C: 0.15% or less Welded parts of galvanized steel sheets do not require much strength,
Rather, we want to maintain high toughness, so C is kept to a small amount.
The upper limit of 0.15% was determined from this viewpoint. Si: 0.3 to 1.0% Mn: 0.7 to 1.8% Both are deoxidizing agents, and if insufficient, blowholes occur due to insufficient deoxidation. Add above the lower limit value. - On the other hand, if too large a amount, the beat shape will become defective, so it should be below the respective upper limit value. Ti: 0.005 to 0.60% Ti is used to reduce blowholes, especially pits. It was found that this effect is effective from a small amount of 0.005%.However, when the amount is large, spatter increases and the bead shape becomes poor, so an upper limit of 0.60% was set. P: 0.02% or less To prevent weld cracking, the smaller the better. Acceptable limit is 0.02%. S: 0.03% or less, preferably 0.015 to 0.03
% Since it causes weld cracking like P, it must not be present in an amount exceeding 0.03%. However, S, together with Ti, contributes to the prevention of blowholes, so 0
．． It can be said that it is rather preferable that it exists in an amount of 0.015% or more. Shielding gas composition: Ar + (3-18)% CO2 Traditionally, Ar + 20% CO2 was typical, but when performing pulsed MAG welding using wire with the above composition, C
It was found that reducing the amount of O2 is better in order to reduce blowholes and spatter, and that it should be kept at 18%. However, if it is less than 3%, blowholes, especially pits, will actually increase. [Example] Steel having the composition shown in Table 1 was rolled and drawn to produce a wire having a diameter of 6-1.2#. A~1] is within the scope of the present invention, and E~1-1 marked with an * has a composition outside the range. Table 1 UC Calendar PS A O,040,360,770,140,0080
006B O,080,351,730,320,01
00,028CO,050,940,760,060,
0070,009D O,040,951,750,5
60,0110,004E* 0.05 0.
61 1.38<O,0O10,9090,012F
*0.060.631.350.680.0120.
008G* 0.050.2B 0.670.0B 0
．． 0090.010H* 0.06 1.08 1.
87 0.10 0.013 0.013 Using the above wire, gas-shielded arc welding of a galvanized steel plate was performed in the next welding strip '1. Shielding gas flow rate: 20.1) /min Pulse conditions: Peak current Pulse width Base current a-4, 20Δ 1.2m5ec 30Ab・5
20A 0.6m5ec 30A welding current: 1
80~20OA Mother line: Thickness 2.3mm, double-sided galvanized steel plate with 45/45 area weight Joint shape: Overlap fillet shape, no gap Weld length: 25
0 m Over the entire weld length, the number of pits and blowholes was counted, the bead shape was evaluated, and the amount of spatter was recorded. The results are shown in Table 2 along with the welding conditions. No. 1 to 6 are examples of the present invention, and No.
, 7* to 12* are comparative examples. Effects of the Invention When using the welding method of the present invention, even if gas-shielded arc welding of galvanized steel sheets is performed without pretreatment to remove 70 layers, there will be very few blowholes and virtually no pits. Moreover, a welded part with a good peak shape can be obtained, and spatter can be reduced.
Claims (2)
溶接する方法において、Ｃ：０．１５％以下、Ｓｉ：０
．３〜１．０％、Ｍｎ：０．７〜１．８％およびＴｉ：
０．００５〜０．６０％を含有し、Ｐ：０．０２％以下
、Ｓ：０．０３％以下であり、残部が実質的にＦｅから
なる組成の鋼ワイヤを使用し、かつＡｒ＋（３〜１８）
％ＣＯ＿２の組成のシールドガスを使用して、パルスマ
グ溶接により実施することを特徴とする溶接方法。(1) In a method of welding galvanized steel sheets by gas-shielded arc welding, C: 0.15% or less, Si: 0
．． 3-1.0%, Mn: 0.7-1.8% and Ti:
A steel wire containing 0.005 to 0.60%, P: 0.02% or less, S: 0.03% or less, and the remainder substantially consists of Fe, and Ar+(3 ~18)
A welding method characterized in that it is carried out by pulsed MAG welding using a shielding gas having a composition of %CO_2.
ヤを使用して実施する特許請求の範囲第１項の溶接方法
。(2) The welding method according to claim 1, which is carried out using a steel wire containing S: 0.015 to 0.030%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61199454A JPH0635066B2 (en) | 1986-08-26 | 1986-08-26 | Welding method of zinc plated steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61199454A JPH0635066B2 (en) | 1986-08-26 | 1986-08-26 | Welding method of zinc plated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6356365A true JPS6356365A (en) | 1988-03-10 |
| JPH0635066B2 JPH0635066B2 (en) | 1994-05-11 |
Family
ID=16408080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61199454A Expired - Lifetime JPH0635066B2 (en) | 1986-08-26 | 1986-08-26 | Welding method of zinc plated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635066B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016179483A (en) * | 2015-03-24 | 2016-10-13 | 岩谷産業株式会社 | Welding method of galvanized steel sheet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5666383A (en) * | 1979-11-06 | 1981-06-04 | Nippon Steel Corp | Gas shielded arc welding method |
| JPS58196177A (en) * | 1982-05-13 | 1983-11-15 | Daido Steel Co Ltd | Welding of coated steel plate |
-
1986
- 1986-08-26 JP JP61199454A patent/JPH0635066B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5666383A (en) * | 1979-11-06 | 1981-06-04 | Nippon Steel Corp | Gas shielded arc welding method |
| JPS58196177A (en) * | 1982-05-13 | 1983-11-15 | Daido Steel Co Ltd | Welding of coated steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016179483A (en) * | 2015-03-24 | 2016-10-13 | 岩谷産業株式会社 | Welding method of galvanized steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0635066B2 (en) | 1994-05-11 |
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