Method of producing weld metal tubing empoying a reusable mandrel
US4830266A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Apr 29, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K37/053
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of producing substantially distortion-free weld metal tubing wherein a mandrel and a thin metal layer covering the mandrel are used to provide structural support for a starter tube while a weld metal is being deposited on the exterior surface of the starter tube to a desired thickness. The material used for the thin metal layer is selected to have a lower melting temperature than that of the mandrel, starter tube and weld metal, and after the weld metal deposit process is completed, the entire assembly is heated to a temperature in excess of the melting temperature of the thin metal layer, the molten material is flowed out from between the mandrel and the starter tube, thereby facilitating extraction of the mandrel from the weld metal tubing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.