Rotary electric arc narrow gap welding method and device driven by hollow shaft motor

Abstract

A welding machine for welding in narrow gap by rotary arc is composed of a connector of welding electric cable, an electric motor unit with hollow shaft for feeding welding wire through it, an electric feeding unit of brush with close slide matching with the flange of electric conducting rod, a spray unit with eccentrical hole for generating the rotary arc at the front end of welding wire, and speed measuring unit consisting of raster and light coupler. Its straight nozzle can be inserted in the narrow gap to be welded.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a rotary arc narrow gap welding method and device driven by a hollow shaft motor. Background technique [0002] Rotary arc narrow gap welding is a new type of narrow gap welding method. It uses a mechanical method to rotate the conductive rod of the torch around its own axis to drive the arc that passes through the end of the welding wire from the eccentric conductive tip to perform a rotary scanning movement, thereby obtaining uniform welding. Stable sidewall penetration. The rotating arc process can also be used in non-narrow gap arc welding occasions to obtain excellent weld shape. The welding torch is the key mechanism to realize the rotary arc welding process. [0003] The narrow-gap welding torch in the existing high-speed rotary arc welding equipment, Japanese Patent Laid-Open No. 58-176073, realizes the movement of the conductive rod through a pair of gear transmission...

AI Technical Summary

Problems solved by technology

The disadvantages of this mechanism are: ①It is driven by an ordinary motor, and the movement of the conductive rod is realized by gear transmission. high

②Relying on two independent springs to make the feed plate contact with the rotating brush to realize welding power feeding, the range of pressing force is small, and the requirements for the consistency of the parameters of the two springs and the symmetry of the pressing force point are high, which may easily cause the pressing force to edge Uneven distribution in the circumferential direction shortens the service life of the key component brushes

③Only use the gas protection nozzle extending into the gap, which makes the protective effect of several welds (especially the cover weld) after multi-layer welding worse

The disadvantages of the scanning torch with this structure are: ①The conductive tip is arranged obliquely and cannot be inserted into the narrow gap groove, so it cannot be used for narrow gap welding

②The large current flows directly through the motor shaft during welding, so that the motor shaft must be made of copper material, and in order to ensure that the motor shaft has sufficient rigidity and conductive area, it is necessary to use a larger diameter motor shaft, thereby increasing the welding time. Torch volume

③The radial sliding cooperation between the brush and the conductive rod realizes the welding power feeding method, which requires multiple brushes to conduct electricity at the same time, which complicates the brush mechanism and is inconvenient for the maintenance of the brushes.

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