Abstract: Two parts are joined along a joining gap disposed therebetween by welding by illuminating the joining gap with an energy beam through a mobile vacuum chamber which is moved, on the side to be welded, on the parts being joined along the joining gap and in which a vacuum is generated. The vacuum chamber forms a first vacuum chamber in which, during welding, a vacuum having a first pressure level is generated, and a vacuum having a second pressure level is generated in a second vacuum chamber which adjoins the first vacuum chamber directly at a chamber wall thereof and which, during welding, regionally covers the joining gap. The pressure levels in the two vacuum chambers are matched to one another or the first pressure level is raised to above the second pressure level by way of a pressure regulating system.

Abstract: Two parts are joined along a joining gap disposed therebetween by welding by illuminating the joining gap with an energy beam through a mobile vacuum chamber which is moved, on the side to be welded, on the parts being joined along the joining gap and in which a vacuum is generated. The vacuum chamber forms a first vacuum chamber in which, during welding, a vacuum having a first pressure level is generated, and a vacuum having a second pressure level is generated in a second vacuum chamber which adjoins the first vacuum chamber directly at a chamber wall thereof and which, during welding, regionally covers the joining gap. The pressure levels in the two vacuum chambers are matched to one another or the first pressure level is raised to above the second pressure level by way of a pressure regulating system.