Arc shield for use in projection welding
US5345054A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/201
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An arc shield is used in projection welding. The projection welding is performed for welding the lower end of a metal stud to the upper surface of a metal plate. The stud has a head and a stem connected securely to the central portion of the lower surface of the head. The arc shield includes an annular horizontal top wall defining a hole therein, and an annular vertical side wall having an annular top end connected securely to the outer peripheral portion of the top wall, and an annular bottom end having a plurality of notches. The annular side wall defines a chamber therein. The hole of the top wall has a size slightly greater than the diameter of the stem of the stud so as to allow for extension of the stem of the stud into the chamber through the hole of the top wall. When the projection welding is being performed, the electric arc is enclosed within the arc shield, while the surplus gas and molten metal that occur in the chamber flow from the arc shield through the notches of the annular side wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.