JP2006082094A - Shielding gas for welding - Google Patents
Shielding gas for welding Download PDFInfo
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- JP2006082094A JP2006082094A JP2004266944A JP2004266944A JP2006082094A JP 2006082094 A JP2006082094 A JP 2006082094A JP 2004266944 A JP2004266944 A JP 2004266944A JP 2004266944 A JP2004266944 A JP 2004266944A JP 2006082094 A JP2006082094 A JP 2006082094A
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Abstract
Description
本発明は、ガスシールドアーク溶接で軟鋼や低合金鋼を溶接する際に使用するシールドガスの組成に関する。 The present invention relates to a composition of a shielding gas used when welding mild steel or low alloy steel by gas shielded arc welding.
一般に、ガスシールドアーク溶接としては、消耗電極式のシールドガス溶接法であるＭＩＧ溶接やＭＡＧ溶接、あるいは、非消耗電極式のシールドガス溶接法であるＴＩＧ溶接が知られている。これらの溶接方法に使用されるシールドガスとしては、ＭＩＧ溶接にあってはアルゴンガスをベースに２Vol％程度の酸素ガスを添加した混合ガスが、ＭＡＧ溶接にあっては、アルゴンガスをベースに２０Vol％程度の炭酸ガスを添加した混合ガスが、また、ＴＩＧ溶接にあっては、アルゴンガスやヘリウムガスが使用されている。 In general, as gas shielded arc welding, MIG welding and MAG welding, which are consumable electrode type shielding gas welding methods, or TIG welding, which is a nonconsumable electrode type shielding gas welding method, are known. As a shielding gas used in these welding methods, a mixed gas in which about 2 Vol% of oxygen gas is added based on argon gas is used for MIG welding, and 20 vol based on argon gas is used for MAG welding. In the case of TIG welding, argon gas or helium gas is used.
そして、軟鋼や４９０Mpa級高張力鋼あるいは低合金鋼の溶接であってもそのシールドガス組成は大きく異なることはなく、例えば、アルゴンガスをベースに酸素ガスとヘリウムガスの３種ガスの混合ガスを使用する技術が知られている。(特許文献１)
ところが、前記従来のものも、不活性ガスであるアルゴンガス及びヘリウムガスを９０Vol％以上使用していることから、ランニングコストが高く、経済的ではないという問題があった。また、炭酸ガスをシールドガスとして使用するガスシールドアーク溶接も知られているが、炭酸ガスは地球温暖化の要因とされ、環境汚染の原因となるという問題がある。 However, since the above-mentioned conventional gas uses 90 vol% or more of argon gas and helium gas which are inert gases, there is a problem that the running cost is high and it is not economical. Gas shield arc welding using carbon dioxide gas as a shielding gas is also known, but carbon dioxide gas is a cause of global warming and has a problem of causing environmental pollution.
本発明は、このような点に鑑み、ランニングコストが低廉でかつ、高い溶接性能をえることのできる新しい組成のシールドガスを提供することを目的とする。 In view of the above, an object of the present invention is to provide a shielding gas having a new composition that has a low running cost and can achieve high welding performance.
上述の目的を達成するために本発明は軟鋼や低合金鋼の溶接用のシールドガスを、窒素ガスと炭酸ガスとの混合ガスで構成し、混合ガスの配合比率を窒素ガス６〜７０Vol％、残り炭酸ガスとしたことを特徴としている。 In order to achieve the above-mentioned object, the present invention comprises a shielding gas for welding mild steel and low alloy steel with a mixed gas of nitrogen gas and carbon dioxide gas, and the mixing ratio of the mixed gas is 6 to 70 Vol% of nitrogen gas, It is characterized by the remaining carbon dioxide gas.
本発明では、ガスシールドアーク溶接に使用するシールドガスを窒素ガスと炭酸ガスとの混合ガスで構成し、混合ガスの配合比率を窒素ガス６〜７０Vol％、残り炭酸ガスとしていることから、コスト的に安価でありかつ、環境にやさしいものでながら、従来の不活性ガスをベースとするシールドガスを使用した溶接と遜色のない溶接結果を得ることができた。 In the present invention, the shielding gas used for gas shielded arc welding is composed of a mixed gas of nitrogen gas and carbon dioxide gas, and the blending ratio of the mixed gas is 6 to 70 Vol% of nitrogen gas and the remaining carbon dioxide gas. Although it is inexpensive and environmentally friendly, it has been possible to obtain welding results that are comparable to conventional welding using a shielding gas based on an inert gas.
本発明に係る軟鋼溶接用シールドガスは、炭酸ガスと窒素ガスとの混合ガスで構成してあり、主として、ＭＩＧ溶接やＭＡＧ溶接等の消耗電極式シールドガス溶接法に適用される。 The shield gas for mild steel welding according to the present invention is composed of a mixed gas of carbon dioxide gas and nitrogen gas, and is mainly applied to consumable electrode type shield gas welding methods such as MIG welding and MAG welding.
板厚２.３mmの軟鋼板(ＳＳ４００)の突き合わせ部を、Ｔi・Ａl入りの１.２mmφ溶接ワイヤを使用して、溶接電流を１００Ａに固定するとともに、溶接速度を３０cm／minに固定し、窒素ガスと炭酸ガスの混合割合を変化させてＭＡＧ溶接機を使用して溶接した。この場合、窒素ガス混合量は９５Vol％から７０Vol％までは５Vol％ごとに、７０Vol％以下では１０Vol％ごとに変化させた。 Using a 1.2 mmφ welding wire containing Ti · Al, the welding current is fixed at 100 A and the welding speed is fixed at 30 cm / min. Welding was carried out using a MAG welding machine while changing the mixing ratio of nitrogen gas and carbon dioxide gas. In this case, the amount of nitrogen gas mixed was changed every 5 Vol% from 95 Vol% to 70 Vol%, and every 10 Vol% below 70 Vol%.
その結果を、溶接部でのブローホール発生状態による溶接評価として図１に示す。
図１によれば、窒素ガス濃度が７０Vol％よりも多い場合には、アークが安定せず、溶接部表面や溶接部内にブローホールが多数見られ、溶接の評価として不可であった。
The result is shown in FIG. 1 as welding evaluation by the blowhole generation state in a welding part.
According to FIG. 1, when the nitrogen gas concentration is higher than 70 Vol%, the arc is not stable, and many blowholes are observed on the surface of the welded part or in the welded part, which is not possible for the evaluation of welding.
図１の結果から、窒素ガスと炭酸ガスの混合ガスで窒素ガスの混合割合が７０Vol％よりも少ない場合には、溶接欠陥の発生を少なくすることができ、アルゴンガス等の不活性ガスをベースとする混合ガスを使用するものと遜色のない溶接を行うことができ、溶接用シールドガスとして十分使用することができることがわかる。 From the results shown in FIG. 1, when the mixing ratio of nitrogen gas and carbon dioxide gas is less than 70% by volume, the occurrence of welding defects can be reduced and an inert gas such as argon gas is used as a base. It can be seen that welding comparable to that using the mixed gas can be performed and can be sufficiently used as a shielding gas for welding.
また、炭酸ガスは地球温暖化に影響を及ぼすガスとして知られていることから、炭酸ガスの混入割合は少ないほうがよいが、京都議定書での炭酸ガス削減目標である６％以上削減することで地球環境にやさしい溶接用シールドガスとすることができる。 Also, since carbon dioxide is known as a gas that affects global warming, it is better for carbon dioxide to be mixed in less, but by reducing the carbon dioxide reduction target of 6% or more under the Kyoto Protocol, It can be a shielding gas for welding that is environmentally friendly.
なお、溶接用シールドガスとして使用する混合ガスは、窒素ガスボンベや液体窒素貯蔵容器等の高純度の窒素ガスを貯蔵している窒素ガス貯蔵容器からの窒素ガスと、炭酸ガスガスボンベ等の炭酸ガス貯蔵容器からの炭酸ガスとを溶接現場で、窒素ガスの混合濃度が７０〜６Vol％となるように混合して使用したり、予め窒素ガスの混合濃度が７０〜６Vol％のうちの所要の濃度に調整されて貯蔵されている炭酸ガス−窒素混合ガス容器から取り出して使用するようにしてもよい。 The mixed gas used as welding shield gas is nitrogen gas from a nitrogen gas storage container that stores high-purity nitrogen gas such as a nitrogen gas cylinder or liquid nitrogen storage container, and carbon dioxide storage such as a carbon dioxide gas cylinder. The carbon dioxide gas from the container is used by mixing at the welding site so that the mixed concentration of nitrogen gas becomes 70 to 6 Vol%, or the mixed concentration of nitrogen gas is previously set to a required concentration of 70 to 6 Vol%. You may make it use it, taking out from the carbon dioxide gas-nitrogen mixed gas container adjusted and stored.
本発明は、軟鋼や４９０Mpa級高張力鋼あるいは低合金鋼の消耗電極式ガスシールドアーク溶接法のシールドガスとして使用することができる。 INDUSTRIAL APPLICABILITY The present invention can be used as a shielding gas for a consumable electrode type gas shielded arc welding method of mild steel, 490 Mpa class high strength steel or low alloy steel.
Claims (1)
Shield gas used for gas shielded arc welding of mild steel and low alloy steel, which is a mixed gas of nitrogen gas and carbon dioxide gas, and the mixture ratio of the mixed gas is 6 to 70 Vol% of nitrogen gas and the remaining carbon dioxide gas Shielding gas for welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004266944A JP2006082094A (en) | 2004-09-14 | 2004-09-14 | Shielding gas for welding |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004266944A JP2006082094A (en) | 2004-09-14 | 2004-09-14 | Shielding gas for welding |
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| JP2006082094A true JP2006082094A (en) | 2006-03-30 |
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