| 摘要 |
A contact tip (1) for gas metal-arc welding comprising: A body (3) of a metal material with a tubular base portion (4) and two or more fingers (5a, 5b) extending in the axial direction from a front end of the base portion; At least one wire-feed conduit (7) extending axially through the body, in which a welding wire is to be received and fed; slots (10a, 10b) arranged between the fingers in order to space these apart, and A spring means (11) surrounding the fingers and exerting a radially acting spring force on the fingers of such strength that the fingers, when cool, are kept spaced apart, such that no pressure will be exerted on the casing surface of a welding wire introduced in the wire-feed conduit, and when heated to a temperature above the softening temperature of the metal material, are compressed by the spring force radially inward in order to exert pressure on the casing surface of a welding wire received in the wire-feed conduit. |
