Shielding gas, welding method by using the same and weldment...

B - Operations – Transporting – 23 – K

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B23K 35/38 (2006.01) B23K 9/167 (2006.01)

Patent

CA 2555426

The object of the present invention is to achieve a deep weld penetration in a welded portion in metal by setting appropriate conditions for welding without deteriorating the quality of welding. That is, in the present invention, the weld penetration can be made deep by using a shielding gas comprising: 0.2% by volume or more (preferably 0.4% by volume or more) of oxygen gas; and the balance being helium gas, and by further setting the other welding conditions, such that the concentration of oxygen in the welded metal in the range of 70 to 700 ppm, and the scale ratio, i.e. the value D/W, can be made large. According to the present invention, a deeper weld penetration can be achieved without deteriorating the quality of welding by adopting at least one selected from the appropriate conditions of the welding current, the welding speed, and the arc length.

La présente invention vise à obtenir une soudure à pénétration profonde dans la portion soudée d'un métal en établissant les conditions de soudage appropriées sans détériorer la qualité de la soudure. Cela consiste, pour la présente invention, à obtenir une soudure à pénétration profonde à l'aide d'un gaz de protection composé à au moins 0,2 % en volume (idéalement 0,4 % en volume ou plus) d'oxygène gazeux, le reste étant de l'hélium, tout en fixant d'autres conditions de soudage de telle sorte que la concentration d'oxygène dans le métal soudé se situe entre 70 et 700 ppm, et le rapport profondeur/largeur soit élevé. Selon la présente invention, on peut obtenir une pénétration de soudure plus profonde sans détériorer la qualité de la soudure en adoptant au moins une des conditions appropriées définies, soit quant au courant de soudage, à la vitesse de soudage ou à la longueur de l'arc.

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