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Laser filler wire welding method for thick plate narrow gap

A technology of laser wire filling and welding method, which is applied to laser welding equipment, welding equipment, welding/welding/cutting objects, etc., can solve the problems of small received energy on the side wall, small melting amount, unfused side wall and bottom, etc. Achieve the effect of avoiding welding porosity and spatter, small heat affected zone, and increasing the thickness range of weldable plates

Active Publication Date: 2014-05-21
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

This method suppresses the occurrence of incomplete fusion of the side wall to a certain extent and increases the weldable plate thickness range of narrow-gap laser welding. When the welding wire is fed into an unstable situation, unfused defects on the side wall and bottom are prone to occur

Method used

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  • Laser filler wire welding method for thick plate narrow gap

Examples

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Embodiment Construction

[0016] In this example, the workpiece is two 60mm thick 304 stainless steel plates that are butted, the groove width is 3.5mm, the blunt edge thickness is 2mm, and the groove depth is 58mm. Stainless steel welding wire ER347 with a diameter of 1mm is used. Using IPG company YLS-6000 fiber laser. The welding parameters are: welding speed 0.36m / min, welding power 4200W, wire feeding speed 3.1m / min, defocus distance 54mm, spot diameter 4mm. The distance between the welding wire and the beam is 2mm. The side-blowing gas protection form is adopted, the flow rate of the protection gas is 25L / min, the protection gas is argon with a purity of 99.9%, and the diameter of the protection gas nozzle is 7mm. The welded joint of the example of the present invention is well formed, and the width of the weld seam is 3.8 mm. No defects such as unfused side walls and welding pores are found in the cross section of the weld seam.

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Abstract

The invention relates to a laser filler wire welding method for a thick plate narrow gap, and belongs to the technical field of laser material processing. The laser filler wire welding method for the thick plate narrow gap is characterized by comprising the steps that positive out-of-focus laser beams are adopted, the laser beams enter a narrow gap groove of a workpiece to be welded and act on the bottom and the side wall of the groove, and a welding pool is formed in a thermal conducting welding mode; a filler wire enters the welding pool in a wire forward feeding mode and is heated through the welding pool to be molten, the gap is filled with the molten wire to form a weld joint, and a thick plate is connected in a single-path multi-layer welding mode. According to the laser filler wire welding method for the thick plate narrow gap, the thermal conducting welding mode and the mode that the filler wire is heated through the welding pool to be molten are adopted, and the welding process is stable; meanwhile, the laser beams act on the side wall of the groove so that the welding defects such as the defect that the side wall is incompletely fused can be effectively avoided.

Description

Technical field [0001] The narrow gap laser welding method of a thick plate belongs to the field of material processing technology. Background technique [0002] The thick plate welding structure is widely used in the fields of ship manufacturing, marine engineering, nuclear power equipment, aerospace and other fields, especially in the field of nuclear power equipment.Success, and some container wall thickness can reach up to 250mm.At present, the method of thick plate welding is the main is arc welding (TIG), the narrow gap buried arc welding and the narrow gap melting polar gas protection welding.Due to the large thermal input volume of these welding methods, the welding joint tissue is relatively large, and the residual stress and deformation of the joints are large. [0003] Compared with conventional welding methods, the narrow gap laser filter welding method combines the dual advantages of laser welding and narrow gap welding. It has the advantages of small thermal input, ...

Claims

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Application Information

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IPC IPC(8): B23K26/26B23K26/14
CPCB23K26/123B23K26/24B23K2101/16B23K2103/04
Inventor 肖荣诗张国伟
Owner BEIJING UNIV OF TECH
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