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

An ultra-high-strength steel, composite welding technology, applied in laser welding equipment, welding equipment, workpiece edge parts, etc., can solve the problems of low tolerance of welding assembly, slow welding speed, inhibiting the efficiency of tailor welding of thick plates, etc. Improved operability and welding efficiency

Inactive Publication Date: 2013-08-21
SHENYANG SIASUN ROBOT & AUTOMATION
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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 thi

Method used

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

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Embodiment

[0022] like figure 1 As shown, in this embodiment, the welding base material is 31Si2MnCrMoVE ultra-high-strength steel plate 4 with a thickness of 10 mm and a tensile strength of 1600 MPa, and the welding wire 3 is H10SiMnCrNiMoV with a diameter of 1.2 mm. First, polish off the rusty part of the tailor welding and clean it with acetone. Then proceed as follows:

[0023] (1) Clamping tailor-welded blanks: open an I-shaped bevel on the part to be welded, and the splicing distance is 1 to 2 mm;

[0024] (2) Use oxyacetylene flame to preheat, and control the preheating temperature within the range of 150°C to 250°C;

[0025] (3) Laser-MAG composite welding: After reaching the preheating temperature, the welding is performed in a composite form in which the arc is in front and the laser 3 is in the back; welding process parameters: laser spot diameter 0.3 ~ 1mm, laser power 4.2KW, arc The current is 280A, the arc voltage is 28.2V; the welding speed is 1m / min, the shielding gas ...

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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

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Claims

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Application Information

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Owner SHENYANG SIASUN ROBOT & AUTOMATION
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