| 摘要 |
The method for connecting thin-walled casings by fusion welding comprises the following: preparation of the end faces to be connected of the casings, abutting arrangement on centring devices and common melting of the end faces to be connected while an arrangement gap sufficient for carrying out the welding is temporarily maintained between the surfaces lying against one another of the end faces. On each of the casings to be connected, deforming of the micro-projections on the surface to be welded of the end faces is carried out by plastic deformation along with upsetting of the material. On the end face, the metal to be deformed is moved to the side of the inner surface of the casing and an inner, annular bead strip is formed thereupon. The casings to be connected are arranged in a device that carries out centring with respect to the outer diameter. Then, initially at the circumference in the plane of the connection, spot welding thereof is carried out. Subsequently, main welding is carried out right through, thereby forming a fusion zone of a width between 4 d and 6 d, where d is the thickness of the wall of the casing to be welded in mm, and the heat removal in the parts to be welded begins at a distance that does not exceed 8 d from the centre line of the connection.
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