Coaxial laser-paraxial heat wire compound TIG welding gun device and realization method thereof

Abstract

The invention discloses a coaxial laser-paraxial heat wire compound TIG welding gun device and a realization method thereof, and belongs to the technical field of coaxial laser-paraxial heat wire TIG compound welding. The device comprises a gun head, a solid tungsten pole pipe and a gun body; the gun head is a substantially conical structure for facilitating gathering of welding arcs and shielding gas to reduce the dissipating speed of the shielding gas; a laser pipe and a wire feeding pipe inserted from the tail part of the tungsten pole pipe to extend to the head part of the tungsten pole pipe are arranged in the solid tungsten pole pipe; and the laser pipe and the wire feeding pipe are gathered in the solid tungsten pole pipe in the gun head to intersect as one pipe. Meanwhile, the invention discloses the realization method of the device; and the realization method comprises three steps of: leading-in of the shielding gas; automatic feeding of welding wires; and emitting of laser beams. The device is suitable for welding in various joint manners, and improves a traditional solid tungsten pole as a double-hole solid tungsten pole; and the tungsten pole pipe in the gun feeds the wires and the gas to realize a preheating effect before welding, so that oxidation of the welding wires is prevented, the coaxiality of the laser beams is guaranteed, and the welding speed and the welding quality are improved.

Description

technical field [0001] A composite TIG welding torch belongs to the technical field of coaxial laser-paraxial hot wire TIG composite welding, and mainly relates to a coaxial laser-paraxial hot wire composite TIG welding torch device and a realization method thereof. Background technique [0002] TIG welding has outstanding process advantages such as stable arc, excellent welding quality, easy control of heat input, adaptable to active non-ferrous metals, stainless steel and various alloys, etc., especially suitable for thin plate and ultra-thin plate material welding, and can be welded in various positions , It is also an ideal method to realize single-sided welding and double-sided forming. However, TIG welding also has obvious process shortcomings: shallow penetration, low deposition speed, low productivity, and poor current carrying capacity of the tungsten electrode. Excessive current will cause the tungsten electrode to melt and evaporate, and its particles may enter th...

AI Technical Summary

Problems solved by technology

However, TIG welding also has obvious process shortcomings: shallow penetration, low deposition speed, low productivity, and poor current carrying capacity of the tungsten electrode. Excessive current will cause the tungsten electrode to melt and evaporate, and its particles may enter the molten pool. , slag pollution (tungsten inclusion)

Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts, but laser welding also has shortcomings: 1) High reflectivity and high thermal conductivity materials such as aluminum, copper and their alloys, etc. Changes by the laser, the weld bead solidifies rapidly, and there may be concerns about porosity and embrittlement; 2) The laser needs to focus on a very precise range, the weldable thickness is limited, and the energy conversion efficiency is too low, usually less than 10%. The cost of the system is high, and the one-time investment is large. It is mainly used for welding thin-walled materials and low-speed welding, and is not suitable for use in production lines; offset

This is because after the laser is focused, the spot size is small, the weld seam is narrow, the assembly accuracy of the workpiece or the beam positioning accuracy cannot meet the requirements, and it is easy to cause welding defects

Images