US 4,254,322 AGranted

Narrow weld-groove welding process and apparatus therefor

AssigneeBabock-Hitachi Kabushiki Kaisha

InventorIsao Asano

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Abstract

A narrow weld-groove welding process, in which a bare welding wire is fed into a weld groove defined between the opposed surfaces of two pieces of metals for producing a metal arc therein for welding. In this process, a welding wire is subjected to a plastic deformation of a wave form, before being fed into a nozzle hole provided in a contact tip, and then the wire is fed into a nozzle hole, while maintaining elasticity tending to cause waving, whereby the tip of a welding wire being fed through a nozzle exit is automatically waved between the opposed surfaces of metals to be joined, with the tip of wire being alternately faced in the opposite directions, in response to the weaving motion thereof, with the feeding of the welding wire and progress of welding. In addition, the apparatus for use in a narrow weld-groove welding process is also disclosed.

Claims10

Dependent claims

A narrow weld-groove welding apparatus, comprising:

a contact tube and means for advancing said contact tube;
secondary gas supply means for spreading the surface of a molten metal in a molten pool laterally relative to an advancing direction of the contact tube by gas being injected therethrough, said secondary gas supply means including a secondary gas nozzle means positioned in the rear of the contact tube at a first distance from a center longitudinal axis of the contact tube as viewed in the advancing direction of said contact tube and constructed for enabling a free flow of gas therefrom;
and
primary gas supply means for pushing back said molten metal in said molten pool relative to said advancing direction by gas being injected therethrough, said primary gas supply means including a nozzle means positioned in close proximity to the front of said contact tube at a second distance from said center longitudinal axis of the contact tube as viewed in said advancing direction, said second distance being less than said first distance, and said primary gas nozzle means being constructed for enabling a free flow of gas therefrom.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 05/880,108Filed 22 Feb 1978 · division
Priority: JP 51/2717815 Mar 1976
Granted: 3 Mar 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B23K 9/26
Features related to electrodes: accessories for electrodes, e.g. ignition tips
B23K 9/0213
Seam welding; Backing means; Inserts: narrow gap welding
B23K 9/173
Making use of shielding gas: and of a consumable electrode
B23K 9/30
Supporting devices for electrodes: vibrating holders for electrodes