Pulsation negative-pressure type laser enhancement KTIG-MIG hybrid welding device and KTIG-MIG hybrid welding method

Abstract

The invention belongs to the technical field of welding equipment and discloses a pulsation negative-pressure type laser enhancement KTIG-MIG hybrid welding device and a KTIG-MIG hybrid welding method. The pulsation negative-pressure type laser enhancement KTIG-MIG hybrid welding device comprises a KTIG welding gun, a laser beam, a MIG welding gun, a welding gun supporting frame, a protective gashood, a welding base, a cooling water device, a gas sending device and a pulsation negative-pressure device. The laser beam penetrates a hollow tungsten electrode of the KTIG welding gun and combineswith a KTIG electric arc in an axial manner. The KTIG welding gun and the MIG welding gun form a certain angle and the angle is adjustable. A hybrid welding torch penetrates the welding base. The welding base is fixedly connected with the welding supporting frame and the protective gas hood is fixedly connected with the welding base. According to the welding device, stable penetration type drilling welding is achieved by the assist of KTIG through the condition that the key hole characteristic of the KTIG electric arc is enhanced with lasers generated by a laser machine; the electric arc formis improved from a goblet shape to a cone shape, so that the welding line heat effect area is reduced; the pulsation negative-pressure device can constrict the electric arc and make the electric arc generate vibration; and a welding joint structure is improved, the welding joint quality is optimized, the welding line forming is uniform and smooth and the welding efficiency is improved.

Description

technical field [0001] The patent of the present invention relates to the technical field of welding equipment, in particular to a pulsating negative pressure laser-enhanced KTIG and MIG composite welding device and method. Background technique [0002] In 1997, Australia's CSIRO Research Institute proposed a high-efficiency welding method—Keyhole TIGwelding, referred to as KTIG welding (Patent No. WO 2010 / 045676 A1). More than 6mm, current greater than 300A, KTIG arc energy and arc pressure will be significantly increased, the welding process will form a stable tail hole, forming a perforation welding similar to plasma arc, especially suitable for materials with high surface tension of liquid metal, for medium thickness below 14mm The plate can realize single-sided welding and double-sided forming effect without opening and filling wire, the weld texture is fine, the quality of welded joints and welding efficiency are significantly improved, and the welding cost is greatly ...

AI Technical Summary

Problems solved by technology

A foreign patent (US2015001185A1) proposes a TIG-MIG composite welding method and a welding torch. This method solves the problems of slow TIG welding speed, low welding efficiency, and large splash in MIG welding. However, this method still has shallow weld penetration and is mostly used for thin plates. Welding and other issues

The domestic utility model patent (application number: 201520695698.3) proposes a fiber-guided weak laser coaxial composite welding torch, that is, a controllable and high-precision arc is obtained through laser-induced TIG arc, but this method also has problems such as shallow welding penetration

In addition, in 1995, the PLT company (Plasma Laser Technologies) formed the core personnel of Barton graduate students in the former Soviet Union Ukraine, combined the plasma arc and the MIG arc on the side axis, and developed the SUPER-MIG hybrid welding, which significantly improved the welding efficiency and achieved 1 +1>2, but the core technology is limited by foreign countries, the welding equipment is complicated and the cost is high

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