| 摘要 |
For joining two faces (41, 42) of thermoplastics in a penetration beam welding method the covered face (42) is multiply scanned and thus incremently heated by a laser beam (10) directed through the covering face (41). This preheating is repeated until the melting temperature is attained. In the region of the covered face (42) a melt thus materializes simultaneously over the full seam length which wets the covering face (41) and thus also transfers this face into melt by heat conduction. On completion of material softening the faces (41, 42) are mutually moved until abutting. Thus the two faces (41, 42) weld in principle as if they had been plasticized simultaneously over the full seam length which significantly enhances the seal and strength of the seam, whilst the expenditure the apparatus is low. |
