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| United States Patent |
6,444,946
|
|
Korte
|
September 3, 2002
|
Method and apparatus for welding
Abstract
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.
| Inventors:
|
Korte; Joern (Huelben, DE)
|
| Assignee:
|
bielomatik Leuze GmbH + Co. (DE)
|
| Appl. No.:
|
563042 |
| Filed:
|
May 1, 2000 |
Foreign Application Priority Data
| Apr 29, 1999[DE] | 199 19 191 |
| Current U.S. Class: |
219/121.6; 219/121.63; 219/121.64; 219/121.66 |
| Intern'l Class: |
B23K 026/00 |
| Field of Search: |
219/121.6,121.63,121.64,121.65,121.66,121.78,121.82
|
References Cited
U.S. Patent Documents
| 3769117 | Oct., 1973 | Bowen et al. | 156/69.
|
| 3989778 | Nov., 1976 | Osborne | 264/25.
|
| 4069080 | Jan., 1978 | Osborne.
| |
| 4908493 | Mar., 1990 | Susemihl | 219/121.
|
| 5267959 | Dec., 1993 | Forman.
| |
| 5501759 | Mar., 1996 | Forman.
| |
| 5645666 | Jul., 1997 | Jones.
| |
| 5729959 | Mar., 1998 | Spatafora et al.
| |
| 5814784 | Sep., 1998 | Kinsman et al. | 219/121.
|
| 5893959 | Apr., 1999 | Muellich | 156/272.
|
| 6191379 | Feb., 2001 | Offer et al. | 219/75.
|
| 6193833 | Feb., 2001 | Gizowski et al. | 156/272.
|
| 2001/0000877 | May., 2001 | Gizowski et al.
| |
| 2001/0000894 | May., 2001 | Gizowski et al.
| |
| Foreign Patent Documents |
| 126824 | Aug., 1977 | DE | .
|
| 42 25 679 | Feb., 1994 | DE.
| |
| 195 10 493 | Oct., 1995 | DE.
| |
| 44 32 081 | Mar., 1996 | DE.
| |
Primary Examiner: Elve; M. Alexandra
Attorney, Agent or Firm: Akerman Senterfitt
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