Process for welding copper materials
US4134001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Oct 11, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/23
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for welding a pair of thick copper plates which comprises welding the pair of copper plates with respective edges placed adjacent to each other on a backing support made of carbon at the adjacent edges in an atmosphere of an inert gas by melting a filler metal with the use of a direct current arc generated between the copper plates connected to the negative pole and a positive electrode with an arc voltage V (volt) and a welding current I (ampere) satisfying the conditions: EQU V = 37 - 45 (1) EQU vi>q (2) EQU i.sup.2 /.sqroot.v < f (3) wherein Q and F are respectively determined from the equations: EQU Q = Va Ia (4) EQU F = Ib.sup.2 /.sqroot.Va (5) wherein Ia (ampere) is the minimum current at which a penetration to the underside of the copper plate is obtained and Ib (ampere) is the minimum current at which a blow hole is formed in the weld by the decomposition of the backing support at any voltage Va (volt) within the above stated range (1). The above stated process makes it possible to weld thick copper plates without causing the oxidation of the weld bead and occurrence of blow holes in the weld bead. Furthermore, this process can be carried out without pre-heating o…
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