| 摘要 |
A method and apparatus for protective gas welding using at least two consumable electrodes to which at least two different potentials are applied is disclosed. A common weld pool is formed by one leading electrode and at least one trailing electrode. When two electrodes are used, this method is also referred to as tandem welding. A larger electrode diameter is used for the leading electrode in comparison with the trailing electrode. Furthermore, a protective gas mixture consisting of 3 to 40 volume % carbon dioxide and/or oxygen and argon and optionally helium is used.
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