【発明の詳細な説明】本発明は非消耗性電極または消耗性電Ｉｉｖ用いる溶融
滴ＩＩにおいて、溶接金属の低温割れを防止するパック
シールド方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packshield method for preventing cold cracking of weld metal in a molten droplet II using a non-consumable electrode or a consumable electrode Iiv.
ＴＩＧ溶接やＭ Ｉ Ｇ＠ｆｉの場合、溶融した溶接金
属を大気から保躾するのに不活性ガスを用いてバックシ
ールドすることが行われて′いる。従来このバックシー
ルドの際のガスの供給は一般にポンベより直接供給する
ととｋより行われ、ガスａＸは環境温［Ｋ順応するのが
一般であった。In the case of TIG welding and MIG@fi, backshielding using an inert gas is used to protect the molten weld metal from the atmosphere. Conventionally, gas was generally supplied directly from a pump during backshielding, and the gas aX was generally adapted to the environmental temperature [K].
このため低い環境温度で溶接した場合、溶接金属の受け
る熱サイクルは急激となり、それに伴う収縮応力や外的
拘束応力の変化も急激となって、価撃的になるという問
題があった。その結果低合金鋼やマルテンサイト系ステ
ンレス鋼、あるいはフェライト系ステンレス鋼などのう
ち衝撃値遷移温度の低いものを低環境温度下で溶接した
場合、低温割れな起す例が従来性々にしてあった。For this reason, when welding is carried out at a low environmental temperature, the thermal cycle to which the weld metal is subjected becomes rapid, and the accompanying changes in shrinkage stress and external restraint stress also become rapid, which poses a problem. As a result, when welding materials with low impact value transition temperatures such as low alloy steels, martensitic stainless steels, or ferritic stainless steels at low environmental temperatures, cold cracking has often occurred. .
本発明はこのような衝撃値遷移温度が低い材料を低源′
境温［下でｉｌ＊しても低温割れの生じないパンクシー
ルド法を提供するものであり、非消耗性電極、消耗性電
極のいずれの電極を用いるかに関係なく、すべての溶融
溶接に適用できるものである。The present invention utilizes materials with low shock value transition temperatures as low-cost materials.
This method provides a puncture shielding method that does not cause cold cracking even at ambient temperatures (IL*), and is applicable to all fusion welding regardless of whether a non-consumable electrode or a consumable electrode is used. It is possible.
本発明者らは、低温割れ発生の原因は溶接金属が衝撃値
遷移温度より低い環境温度まで冷却される途中において
低温脆化状態となったとき、熱サイクルに伴５１１撃的
収縮応力および外的拘束応力が加わるととＫある点に着
目し、これらの衝撃的応力の加わる時期にパックシール
ドガスにより加温して電性を付与し続ければ低温割れを
防止できることを知見した。The present inventors believe that the cause of low-temperature cracking is that when the weld metal enters a low-temperature embrittlement state while being cooled to an environmental temperature lower than the shock value transition temperature, 511 impact shrinkage stress and external stress due to thermal cycles occur. Focusing on certain points when confining stress is applied, the researchers found that low-temperature cracking can be prevented by continuing to provide electrical properties by heating with pack shield gas during the period when these impulsive stresses are applied.
すなわち、本発明は従来の無加熱パックシールド法に対
して、パックシールドガスを加熱して供給する点を特徴
とするものであり、低温割れを防止する加熱温度として
は溶接金属の衝撃値の遷移温度以上、２００１［以下が
適当であることを１ＩＩ１１した。That is, the present invention is characterized in that the pack shielding gas is heated and supplied in contrast to the conventional non-heating pack shielding method, and the heating temperature to prevent cold cracking is determined by the transition of the impact value of the weld metal. It was determined that a temperature above 2001 [1II11] is appropriate.
ここでバックシールドガスの加熱温度下１１１ｖ溶綴金
属の衝撃値の遷移温度以上としたのは従来の無加熱パッ
クシールド法、において発生した低温割れが低温脆化に
よるものであるため、この低温脆化を防止するには溶接
金属の衝撃値の遷移温度以上に溶接金属゛を加温する必
要があるからである。Here, the reason why the heating temperature of the back shielding gas was set to 111V or higher than the transition temperature of the impact value of the welded metal is because the low temperature cracking that occurs in the conventional unheated pack shielding method is due to low temperature embrittlement. This is because in order to prevent this, it is necessary to heat the weld metal to a temperature higher than the transition temperature of the impact value of the weld metal.
一方加熱温度゛上限１に２００Ｃ以下としたのは、２０
０Ｕｔ−超えるへ予熱効果により溶接熱サイクルの冷却
速度がゆるやかになりすぎて、フエフイト系ステンレス
鋼などにおい″Ｃ４７５Ｃ脆化の危険が増すためである
。On the other hand, the heating temperature 'upper limit 1 was set to 200C or less.
This is because the cooling rate of the welding thermal cycle becomes too slow due to the preheating effect beyond 0 Ut, increasing the risk of C475C embrittlement in Fehuite stainless steel and the like.
溶接の際の上述のように加熱したバックシールドガスの
供給は溶接金属がバックシールドガス温置まで低下して
定常状態になるまで行う。During welding, the heated backshield gas is supplied as described above until the weld metal reaches the temperature of the backshield gas and reaches a steady state.
本発明におけるバックシールドガスの加熱はガス内゛に
温気や粉塵など溶接上障害となるものの混入するおそれ
がなければいかなる方法によってもよい。The backshielding gas in the present invention may be heated by any method as long as there is no risk of the mixture of hot air, dust, or other substances that would be a hindrance to welding into the gas.
次に実施例により説明する。Next, an example will be explained.
第１図は従来の無加熱バンクシールド法によりＴＩＧ溶
接およびＭＩＧ＠接を行う場合の溶接方法を示す図で、
第２図は本発明法によりＴＩＧ溶接およびＭＩＧ溶接を
行う場合の溶接方法を示す図である。第１．２図におい
て１および２はそれぞれアークシールド用Ａｒガスボン
ベおよび）（ツクシールド用Ａｒガスボンベで、３は溶
接機である。Figure 1 is a diagram showing a welding method when performing TIG welding and MIG@ welding using the conventional non-heating bank shield method.
FIG. 2 is a diagram showing a welding method when performing TIG welding and MIG welding according to the method of the present invention. In Fig. 1.2, 1 and 2 are Ar gas cylinders for arc shielding and ) (Ar gas cylinders for Tsukshield, respectively), and 3 is a welding machine.
４４’！、）−４５のパワーケーブル、６および１＆！
それぞれ拘束治具の下板および上押え板で、両者の関に
溶接サンプル８を入れて、拘束用ボルト９で固定し【あ
る。拘束治具の下板６にはノ（ツクシールド用ガス供給
できる穴１０があけられ、そこにバックシールド用ムｒ
ガスボンベ２よりの鋼配管１１を接続しである。そして
第２図の場合はこの銅配管１１の途中に加熱炉１２を設
けて、）（ツ゛−クシールドガスな加熱し、七や加勢ガ
ス温Ｊ［を、熱電対１３で測定して記録計１４に記録で
、きるようにしである。44'! , )-45 power cables, 6 and 1 &!
A welding sample 8 was inserted between the lower plate and the upper holding plate of the restraint jig, respectively, and fixed with restraint bolts 9. A hole 10 is drilled in the lower plate 6 of the restraint jig to supply gas for the back shield.
A steel pipe 11 from the gas cylinder 2 is connected. In the case of Fig. 2, a heating furnace 12 is installed in the middle of this copper piping 11, and the heating gas is heated with a thermocouple 13. It was recorded on the 14th so that it could be completed.
１、以上のよ−うな溶接方法により第１表に示す溶接素
材および溶接心線ｐ化、学組成のものを使用、し、板厚
６．〇−溶接心１１＠Ｌ２コ、溶−接環境温匿−１０〜
’ｑ、ｏｃ、かつバックシールドガス温度を素材遷移温
度約１０．Ｃ，心線の溶着金属の遷移温［２０ＣよりＣ
高い、たとへば６ＧＣ１−選んで施工した。
・ −−１第 １ 表この溶接素材の遷移温！ＩＬ′４Ｉ：第３図に示す。第
４図は第１表に示す溶接素材と溶接心線を用い溶接した
場合の溶着金属の遷移温度を示す。上記の）（ツクシー
ルドガス温度は第３図、第４６図の遷移温ｊｌｊ（１０
Ｃ）、（２０Ｃ）より高い６０Ｇを選んで実施した。こ
の結果を第５．６．７．８図をもって説明する。1. Using the welding method described above, welding materials and welding cores with p-type and chemical compositions shown in Table 1 were used, and the plate thickness was 6. 〇-Welding core 11@L2, welding environment warmth -10~
'q, oc, and backshield gas temperature to material transition temperature of about 10. C, transition temperature of the weld metal of the core wire [C from 20C
It was expensive, so I chose 6GC1 and installed it.
・--1 Table 1 Transition temperature of this welding material! IL'4I: Shown in FIG. FIG. 4 shows the transition temperature of the deposited metal when welding is performed using the welding materials and welding cores shown in Table 1. The above ) (Tsu shield gas temperature is the transition temperature jlj (10
C), 60G higher than (20C) was selected and implemented. This result will be explained with reference to Fig. 5.6.7.8.
第５図より第８図までは溶接後の溶接金属のＸ線透過写
真を示すもので、第５図、第６−はノ（ツクシールドガ
スを加熱することなくそれぞれＭＩＧ溶接およびＴＩＧ
滴接した場合、第７図、第８図はバックシールドガスｆ
−６０Ｃに加熱してそれぞれＭ Ｉ Ｇ＠接およ、びＴ
ＩＧ溶接した場倉夕ある。Figures 5 to 8 show X-ray photographs of weld metal after welding, and Figures 5 and 6 show MIG welding and TIG welding without heating the shielding gas, respectively.
In the case of droplet contact, Figures 7 and 8 show the backshield gas f.
Heat to -60C and connect M I G @ and T
There is Yu Bakura who did IG welding.
第５図、縞６図には溶Ｉ！章属内に低温割れが認められ
るが、第７図、第、８図には認め、ｇｐれない。Figure 5 and stripe 6 show melt I! Cold cracking is recognized within the chapter, but it is recognized in Figures 7, 8, and 8, and no GP is observed.
以上の如く、本発明によれば衝撃値遷移温度の低い鋼を
低環境温度下で溶接しても低温割れが発生せず１、低環
境ｉｉｔ、下における溶接品質、向上に大き４く寄与す
る。As described above, according to the present invention, even if steel with a low impact value transition temperature is welded at a low environmental temperature, cold cracking does not occur, which greatly contributes to improving welding quality in a low environmental temperature. .
第１図は実施例に用いた従来法による溶接方法を示す図
であり、第２図は本発明法による溶接方法を示す図であ
る。第３図は溶接素材の衝撃特性による遷移温度を示し
、第４図は溶接素材と溶接心線を用い溶接した場合にお
ける溶着金属部の衝撃特性による遷移温Ｗ、！示す。第
５図より第８図は溶接金属のＸ線透過！−゛で輸第５図
、第６図はバックシールドガスを加熱しな−（Ｓでそれ
ぞれＭＩＧ溶接およびＴＩＧ溶接をした場合、第７図、
第８図はバックシールドガス１に６０Ｃに加熱してそれ
ぞれＭＩＧ溶接およびＴｌＧ１！接をした場合である。特許出願人日新製鋼株式会社代理人連勝 満−−・１．５．１、イ゛・ 、 、第２図第：３図試験温度（０Ｃ）試験温度（°Ｃ）FIG. 1 is a diagram showing a conventional welding method used in the example, and FIG. 2 is a diagram showing a welding method according to the present invention. Figure 3 shows the transition temperature due to the impact characteristics of the welding material, and Figure 4 shows the transition temperature W, ! due to the impact characteristics of the welded metal part when welding using the welding material and weld core wire. show. From Figure 5 to Figure 8, X-ray transmission of weld metal! Figures 5 and 6 are shown in Figures 5 and 6 when the backshield gas is not heated.
Figure 8 shows backshield gas 1 heated to 60C and MIG welded and TlG1! This is a case of contact. Patent Applicant Nissin Steel Co., Ltd. Agent Consecutive Wins - 1.5. 1.I... , Figure 2: Figure 3 Test temperature (0C) Test temperature (°C)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4632982AJPS58163575A (en) | 1982-03-25 | 1982-03-25 | Back shielding method of melt welding |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4632982AJPS58163575A (en) | 1982-03-25 | 1982-03-25 | Back shielding method of melt welding |
| Publication Number | Publication Date |
|---|---|
| JPS58163575Atrue JPS58163575A (en) | 1983-09-28 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4632982APendingJPS58163575A (en) | 1982-03-25 | 1982-03-25 | Back shielding method of melt welding |
| Country | Link |
|---|---|
| JP (1) | JPS58163575A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2703109A1 (en)* | 2012-09-04 | 2014-03-05 | Linde Aktiengesellschaft | Methods of and device for providing a heated or cooled protective gas for welding, especially laser welding |
| CN104668865A (en)* | 2015-03-09 | 2015-06-03 | 中国人民解放军第五七一九工厂 | Thermocouple welding clamping device |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2703109A1 (en)* | 2012-09-04 | 2014-03-05 | Linde Aktiengesellschaft | Methods of and device for providing a heated or cooled protective gas for welding, especially laser welding |
| CN104668865A (en)* | 2015-03-09 | 2015-06-03 | 中国人民解放军第五七一九工厂 | Thermocouple welding clamping device |
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