| 摘要 |
The protective gas, for protective gas arc welding to form joints between materials of different types and melting points, is a mixture with an active gas component. The gas mixture is especially of helium and active gases at 0.005-0.5 vol.%. The gas mixture contains oxygen (O2), carbon dioxide (CO2), nitrogen oxide (NO), dinitrogen oxide (N2O) or nitrogen (N2), argon and/or helium. |
