Laser-MAG (Metal-Active-Gas) compound welding method used for welding and splicing high-strength or ultrahigh-strength steel of thick plate

Abstract

The invention discloses a laser-MAG (Metal-Active-Gas) compound welding method used for welding and splicing high-strength or ultrahigh-strength steel of a thick plate. The method aims at high-strength or ultrahigh-strength steel thick plates and utilizes a laser-MAG compound heat source to carry out single-side single-channel, single-layer and double-face molding welding; a welding part is an I-shaped groove; laser or oxyacetylene torch is adopted to pre-heat a work-piece before welding; and the temperature is kept for 20 min to 1 hour after the welding. The welding technical parameters are that the spot diameter of the laser is 0.3-1 mm, the laser power is 4-10 KW, the arc current is 200-300 A, and the arc voltage is 25.2-30 V. By improving the form of the groove of the work-piece and reserving an assembling distance and optimized welding parameters during the splicing, the splicing and welding of the ultrahigh-strength steel plate is realized; the welded joint performance is satisfied with and better than that of regular TIG (Tungsten-Inert-Gas) welding, the welding speed can be up to 60 m / h; and the welding efficiency is improved by 10 times than the regular TIG welding.

Description

technical field [0001] The invention relates to the technical field of thick plate processing by laser arc hybrid welding, in particular to a laser-MAG hybrid welding method for tailor welding of high-strength or ultra-high-strength steel for thick plates. Background technique [0002] With the rapid development of high-strength and ultra-high-strength steel in aerospace and other military equipment, higher requirements have been put forward for the welding efficiency of thick-plate high-strength and ultra-high-strength steel on the basis of meeting the performance of welded joints. [0003] For the splicing and welding of high-strength or ultra-high-strength steel in thick plates, the domestic industry mainly adopts conventional TIG welding with blunt edges reserved for beveling. Affected by TIG welding's own process, welding speed and welding penetration, it is necessary to pre-open Y-shaped grooves for multi-layer and multi-pass welding for thick plate tailor welding. The...

AI Technical Summary

Problems solved by technology

Affected by TIG welding's own process, welding speed and welding penetration, it is necessary to pre-open Y-shaped groove for multi-layer and multi-pass welding for thick plate tailor welding. These problems inhibit the improvement of thick plate tailor welding efficiency

In the existing high-strength steel welding technology using laser arc hybrid welding, a Chinese patent application (publication number CN101367157A) discloses a welding method for welding high-strength or ultra-high-strength steel thick plates. " type groove, or the method of opening a 60° "X" type groove, its disadvantage is that the welding speed is slow, and it does not bring efficient production under the input of high-cost laser arc composite heat source

In addition, a Chinese patent application (publication number CN101733564A) discloses a laser-arc composite heat source high-speed welding method for ultra-high-strength steel with a weld gap controlled at 0mm. Assembly before welding brings great difficulty and inconvenience

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