| 摘要 |
The gas manifold ( 1 ) adapted for installation on a cooking range includes a conduit ( 2 ) for distribution of a flow (Q) at a pressure "P", with a number of regulating taps ( 5 ) fixed to the conduit ( 2 ). The conduit is made from a metal pipe ( 3 ) with a thin cylindrical wall To and the pipe end ( 6 ) is sealed without cracks by means of friction welding with no addition of material, with a sealing wall ( 7 ) formed by means of a thickening in the form of a tip ( 7 a) in the axial direction of an enlargement or height "H" greater than the original thickness To of the pipe. For making the gastight closure a rotary tool ( 8 ) is used that includes at least two rotary rollers ( 9 ) for the compaction of the metallic mass between two counterposed centripetal forces (Fr), in combination with an axial stretching force (Fa).
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