JPS5913570B2 - Annealing method for strip welds - Google Patents
Annealing method for strip weldsInfo
- Publication number
- JPS5913570B2 JPS5913570B2 JP14503676A JP14503676A JPS5913570B2 JP S5913570 B2 JPS5913570 B2 JP S5913570B2 JP 14503676 A JP14503676 A JP 14503676A JP 14503676 A JP14503676 A JP 14503676A JP S5913570 B2 JPS5913570 B2 JP S5913570B2
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- strip
- temperature
- oxygen
- weld
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】
本発明はストリップ溶接工程後の該溶接部を燃焼式バー
ナーによって焼鈍する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for annealing a weld after a strip welding process using a combustion burner.
ストリップの製造工程、例えばステンレス鋼冷延薄板の
製造工程においては、通常ゼンジミアミル等における作
業能率の向上を目的として、複数の熱延コイルを溶接(
TIG又はMIG)によって接続し大径コイルとするコ
イルビルドアップ工程がある。In the manufacturing process of strips, for example cold-rolled stainless steel sheets, multiple hot-rolled coils are usually welded (
There is a coil build-up process in which the coils are connected by TIG or MIG to form a large diameter coil.
該工程において溶接された溶接部は通常燃焼式バーナー
を用いたボストアニーラ−によって焼鈍を行っている。The welded parts welded in this process are usually annealed by a boss annealer using a combustion type burner.
しかし該燃焼式バーナーによる焼鈍においては、供給口
からヘッダーを介し、ノズルから噴出する火炎は供給口
からの流れ方向によりノズル長手方向に片寄りが発生し
、又ノズルの直下中上・部がノズル間部に比べ局部加熱
されるため、溶接部長手方向において不均一加熱される
ことになる。However, in annealing using the combustion type burner, the flame ejected from the nozzle through the header from the supply port is biased in the longitudinal direction of the nozzle due to the flow direction from the supply port, and the upper middle part directly below the nozzle is Since the weld is heated locally compared to the intermediate part, the weld is heated non-uniformly in the longitudinal direction.
このため溶接部に波釘が発生し次工程のビード切削作業
に困難をきたし、又不均一加熱による焼鈍不良が発生し
次工程の圧延時板破断が発生することがあった。As a result, corrugated nails were generated in the welded part, making it difficult to perform bead cutting in the next process.Furthermore, annealing failures occurred due to uneven heating, which could lead to plate breakage during rolling in the next process.
また、従来の燃焼は、酸素源としては空気のみの供給が
一般的であるが、酸素単味もしくは酸素を富化させるこ
とは、時間短縮をはかる上で有効である。Further, in conventional combustion, only air is generally supplied as an oxygen source, but it is effective to use only oxygen or enrich oxygen in order to shorten the time.
しかしながら、この方法では、前記ノズル直下部とノズ
ル間部の温度差(焼ムラ)を助長し、更に均熱時の温度
保持が極めて難しい欠点がある。However, this method has the drawback that it promotes a temperature difference (uneven baking) between the area immediately below the nozzle and the area between the nozzles, and furthermore, it is extremely difficult to maintain the temperature during soaking.
即ち、酸素単味もしくは酸素を富化して供給すると火炎
温度が急上昇し、急速加熱面では目的を達するが、火炎
の衝突するノズル直下部とノズル間では、使用に耐えな
い程の温度差を生じ、特に薄板では実用できない。In other words, supplying oxygen alone or enriched with oxygen causes the flame temperature to rise rapidly and achieve the goal in terms of rapid heating, but between the nozzle and the area directly below the nozzle where the flame collides, a temperature difference that cannot be used is created. , it is not practical, especially for thin plates.
又前記の昇温過程の他に、均熱過程で、火炎温度をあげ
ると許容温度域上限を越え、焼鈍の目的を達し得なくな
る。In addition to the above-mentioned temperature raising process, if the flame temperature is increased in the soaking process, the upper limit of the allowable temperature range will be exceeded, and the purpose of annealing will not be achieved.
この対処法として、温度を検出し燃焼量の制御を行う方
法が考えられるが、一般的に溶接部の焼鈍炉は、コイル
のビルドアップ(溶接)をはじめ、サイドトリミングな
ど、一連の多機能を連続的に処理するラインに組込まれ
るケースが多く、これらの作業性を損わぬ様、オープン
タイプの簡素な炉を用いていることから該構造の炉では
、温度制御(検出法を含め)そのものの精度上の問題も
あり、適用できない。One way to deal with this problem is to detect the temperature and control the amount of combustion, but generally speaking, annealing furnaces for welded parts perform a series of multi-functional functions such as coil build-up (welding) and side trimming. In many cases, it is installed in a continuous processing line, and a simple open type furnace is used so as not to impair workability. It cannot be applied due to accuracy problems.
又余分の温度制御装置及び炉の構造を温度制御可能なタ
イトな構造にする必要があり投資額の増大を招くので適
当でない。Furthermore, it is not appropriate to use an additional temperature control device and the furnace structure because it requires a tight structure that allows temperature control, which increases the investment amount.
本発明はストリップ溶接後の該溶接部を燃焼式バーナー
によって焼鈍する方法においてこのような欠点を解決す
るものでバーナ一本体をストリップ幅方向(溶接部長手
方向)へ揺動させながら焼鈍を行うことを特徴とするも
のである。The present invention solves these drawbacks in a method of annealing the welded part after strip welding using a combustion burner, and the annealing is performed while the burner body is oscillated in the width direction of the strip (longitudinal direction of the weld length). It is characterized by:
第1図はストリップ溶接部を燃焼式バーナーによって焼
鈍する場合のバーナ一本体の揺動の例を示し、1はスト
リップ、2はストリップの溶接部、3はストリップ幅方
向表裏面に接近して配設され溶接部長手方向に多数のノ
ズル4が配列された燃焼式バーナーである。Figure 1 shows an example of the swinging of the burner main body when a strip weld is annealed by a combustion burner, where 1 is the strip, 2 is the welded part of the strip, and 3 is arranged close to the front and back surfaces of the strip in the width direction. This is a combustion type burner in which a large number of nozzles 4 are arranged in the longitudinal direction of the welding length.
そしてこのような燃焼式バーナー3がストリップ下面側
にも配設されている。Such a combustion type burner 3 is also arranged on the lower surface side of the strip.
溶接部2の焼鈍に際しては燃焼ガス及び空気が供給口5
からヘッダー6を介してノズル4から、溶接部2の表裏
面に火炎として噴射されるが、この場合前記の如くして
ノズル4の直下中心部0点が局部加熱される。When annealing the welded part 2, combustion gas and air are supplied to the supply port 5.
The flame is injected from the nozzle 4 through the header 6 onto the front and back surfaces of the welded portion 2, but in this case, the zero point directly below the nozzle 4 is locally heated as described above.
又バーナ一本体長手方向において火炎の分布に片寄を生
ずる。Also, the flame distribution is uneven in the longitudinal direction of the burner body.
そこで燃焼式バーナー3を揺動するものである。Therefore, the combustion type burner 3 is oscillated.
即ちストリップ幅方向に往復動〔矢印45口の方向〕す
ることにより、火炎の中心部0点さらにはノズル長手方
向における火炎の強さの分布が溶接部長手方向へ移動す
るから溶接部が均一に加熱されるものである。That is, by reciprocating in the width direction of the strip [in the direction of arrow 45], the zero point at the center of the flame and the distribution of flame intensity in the longitudinal direction of the nozzle move in the longitudinal direction of the welding length, so that the welded area is uniform. It is heated.
往復動の距離についてはノズル4の間隔及び火炎の片寄
り分布により適宜に調節することが好ましく、又揺動の
周期は比較的緩やかな速度でよい。It is preferable that the distance of the reciprocating movement be appropriately adjusted depending on the interval between the nozzles 4 and the uneven distribution of the flame, and the period of the oscillation may be set at a relatively gentle speed.
本発明の効果は上記の如く均一加熱されるから燃焼式バ
ーナーによって短時間に焼鈍を行う場合特に効果が大き
い。The effect of the present invention is particularly great when annealing is performed in a short time using a combustion type burner because uniform heating is achieved as described above.
即ち複数のノズルからの火炎分布が拡散されるから急速
加熱を行っても不均一加熱されることがない。That is, since the flame distribution from the plurality of nozzles is spread, even if rapid heating is performed, uneven heating will not occur.
また前記燃焼式バーナーによるストリップ溶接部の揺動
焼鈍において溶接部が所要の均熱温度域に到達するまで
は燃焼ガスに酸素のみを供給するか又は供給空気に酸素
を富化し急速昇温を行い、均熱温度域に達したら空気の
みを供給して火炎温度を下げることによって急速加熱を
行っても溶接部長手方向に均一加熱することができる。In addition, in the oscillating annealing of strip welds using the combustion burner, only oxygen is supplied to the combustion gas, or the supply air is enriched with oxygen to rapidly raise the temperature until the weld reaches the required soaking temperature range. By supplying only air to lower the flame temperature once the soaking temperature range is reached, even if rapid heating is performed, uniform heating in the longitudinal direction of the welded length can be achieved.
第2図は燃焼式バーナーによるガス焚焼鈍装置を用いた
フェライト系ステンレス鋼熱延板(板厚40朋)溶接部
の焼鈍において、加熱開始から焼鈍終了までの加熱域、
均熱域を通して燃料ガスに空気のみを供給した場合■と
所定の均熱温度(750℃)までの加熱温度域では前記
供給空気に代えて酸素のみを供給し、均熱温度域(75
0〜850℃)においては酸素の供給を中止し代わりに
空気を供給した場合■の溶接部の昇温曲線を示す。Figure 2 shows the heating range from the start of heating to the end of annealing during annealing of a welded part of a hot-rolled ferritic stainless steel plate (thickness: 40 mm) using a gas-fired annealing device using a combustion burner.
In the case where only air is supplied to the fuel gas through the soaking temperature range (■) and in the heating temperature range up to the predetermined soaking temperature (750°C), only oxygen is supplied instead of the supply air.
0 to 850°C), the temperature rise curve of the welded part (3) is shown when the supply of oxygen is stopped and air is supplied instead.
第2図から明らかなように■の場合は焼鈍に3分を要し
ているのに対し、■の場合は僅か1.5分に短縮されて
いる。As is clear from FIG. 2, annealing takes 3 minutes in the case of ①, whereas it takes only 1.5 minutes in the case of ②.
即ち焼鈍時間を短縮するには加熱開始から所定の均熱温
度域までは燃焼ガスに酸素のみ又は供給空気に酸素を富
化することにより火炎温度を高くし加熱時間の短縮を画
ることが可能である。In other words, to shorten the annealing time, it is possible to increase the flame temperature and shorten the heating time by using only oxygen in the combustion gas or enriching the supplied air with oxygen from the start of heating until the predetermined soaking temperature range. It is.
次に均熱温度域において溶接部温度を所定の温度域に安
定して保持する必要がある。Next, it is necessary to stably maintain the welding part temperature within a predetermined temperature range in the soaking temperature range.
このためには酸素の富化供給を停止し空気のみを供給す
ることにより溶接部温度を全域に拡散することが可能で
ある。For this purpose, it is possible to spread the temperature of the weld zone over the entire area by stopping the enriched supply of oxygen and supplying only air.
本発明を実癩することによって急速加熱が可能でありス
トリップの連続処理ラインにおける焼鈍においては、ラ
イン停止時間も少なくて済むから該溶接工程を連続処理
ラインに組込み工程省略する上で、より好ましい効果を
発揮するものである。By implementing the present invention, rapid heating is possible and during annealing in a continuous strip processing line, the line stop time can be shortened, so the welding process can be incorporated into the continuous processing line and the process can be omitted, resulting in a more favorable effect. It is something that demonstrates the.
次に本発明の実癩例を示す。Next, a practical example of the present invention will be shown.
第1表はSUS 430熱延板(板厚4.0龍)をTI
G溶接後燃焼式バーナーを用いて本発明による焼鈍を行
った/161〜Nと比較例として本発明外の焼鈍を行っ
たAIV〜■の結果を示す。Table 1 shows the TI of SUS 430 hot-rolled plate (thickness 4.0).
The results are shown for /161~N in which annealing according to the present invention was performed using a combustion type burner after G welding and for AIV~■ in which annealing outside the present invention was performed as a comparative example.
本発明法は比較例と比べて焼鈍後の溶接部形状が良好で
あり、圧延時の溶接部割れが発生しない。In the method of the present invention, the shape of the welded part after annealing is better than that of the comparative example, and no cracking of the welded part occurs during rolling.
また本発明法iiの焼鈍所要時間が1.9分であるに対
し、比較例の屑■は3分を要しており、約2/3に短縮
している。Further, the annealing time required for method ii of the present invention was 1.9 minutes, whereas the time required for annealing was 3 minutes for the comparative example scrap (2), which was shortened to about 2/3.
従って本発明法を連続処理ラインにおいて実櫂すればル
ープ量が2/3に短縮可能であり連続処理ラインに組み
込む上で好都合である。Therefore, if the method of the present invention is applied to a continuous processing line, the loop amount can be reduced to 2/3, which is convenient for incorporating into the continuous processing line.
【図面の簡単な説明】
第1図はストリップ溶接部を燃焼式バーナーによって焼
鈍する場合のバーナ一本体の揺動状態を例示する図でa
は正面図、bは側面図。
第2図は燃焼式バーナーによるガス焚焼鈍装置を用いた
フェライト系ステンレス鋼熱延板溶接部の焼鈍における
溶接部の昇温曲線を示すグラフ。
図中、1はストリップ、2は溶接部、3は燃焼式バーナ
ー、4はノズル、5は燃焼ガス及び空気の供給口、6は
ヘッダー。[Brief explanation of the drawings] Figure 1 is a diagram illustrating the swinging state of the burner body when a strip weld is annealed using a combustion burner.
is a front view, and b is a side view. FIG. 2 is a graph showing a temperature rise curve of a welded part during annealing of a welded part of a hot rolled ferritic stainless steel plate using a gas-fired annealing apparatus using a combustion type burner. In the figure, 1 is a strip, 2 is a welded part, 3 is a combustion burner, 4 is a nozzle, 5 is a combustion gas and air supply port, and 6 is a header.
Claims (1)
バーナーによってストリップ溶接部の焼鈍を行う方法に
おいて、バーナ一本体を溶接部長手方向へ揺動させなが
ら焼鈍を行うことを特徴とするストリップ溶接部の焼鈍
方法。 2 溶接部が所要の均熱温度域に到達するまでは燃焼ガ
スに酸素のみを供給するか又は供給空気に酸素を富化し
急速昇温を行い、均熱温度域に達したら空気のみを供給
して火炎温度を下げることを特徴とする特許請求の範囲
第1項記載のストリップ溶接部の焼鈍方法。[Claims] 1. A method of annealing a strip weld using a combustion type burner in which a plurality of nozzles are arranged in the longitudinal direction of the weld length, in which annealing is performed while the burner body is oscillated in the longitudinal direction of the weld length. A method for annealing a strip weld characterized by: 2. Until the welding part reaches the required soaking temperature range, only oxygen is supplied to the combustion gas or the supply air is enriched with oxygen to rapidly raise the temperature, and once the soaking temperature range is reached, only air is supplied. 2. The method of annealing a strip weld according to claim 1, wherein the flame temperature is lowered by the step of reducing the flame temperature.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14503676A JPS5913570B2 (en) | 1976-12-02 | 1976-12-02 | Annealing method for strip welds |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14503676A JPS5913570B2 (en) | 1976-12-02 | 1976-12-02 | Annealing method for strip welds |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5370016A JPS5370016A (en) | 1978-06-22 |
JPS5913570B2 true JPS5913570B2 (en) | 1984-03-30 |
Family
ID=15375910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14503676A Expired JPS5913570B2 (en) | 1976-12-02 | 1976-12-02 | Annealing method for strip welds |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913570B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014116950B4 (en) * | 2014-11-19 | 2018-02-15 | Thyssenkrupp Ag | A process for hot or warm forging a workpiece and manufacturing plant for hot or warm forging a workpiece |
WO2016192994A1 (en) * | 2015-05-29 | 2016-12-08 | Voestalpine Stahl Gmbh | Method for the homogeneous non-contact temperature control of non-endless surfaces which are to be temperature-controlled, and device therefor |
-
1976
- 1976-12-02 JP JP14503676A patent/JPS5913570B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5370016A (en) | 1978-06-22 |
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