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Laser wire-filling welding method for thick plate with 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 melting amount, unfused side wall and bottom, and low energy received by the side wall, etc. Achieve the effect of small heat affected zone, avoid welding pores and spatter, and increase the thickness range of weldable plates

Active Publication Date: 2016-05-25
BEIJING UNIV OF TECH
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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 wire-filling welding method for thick plate with narrow gap
  • Laser wire-filling welding method for thick plate with narrow gap

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Embodiment Construction

[0014] For the implementation of this example, see the attached figure 1 . The laser beam is perpendicular to the horizontal plane, the angle between the welding wire and the laser beam is 45°, and the front wire feeding mode is adopted.

[0015] 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. The diameter of stainless steel wire ER347 is 1mm. 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 i...

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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 invention relates to a narrow-gap laser wire-filling welding method for a thick plate, which belongs to the technical field of material processing. Background technique [0002] Thick plate welded structures are widely used in shipbuilding, marine engineering, nuclear power equipment, aerospace and other fields, especially in the field of nuclear power equipment, thick plates are most widely used, and the thickness range is also the largest. For example, reactor pressure vessels are mostly welded with large thickness stainless steel plates. into, while some containers have a wall thickness of up to 250mm. At present, the welding methods of thick plates are mainly argon arc welding (TIG), narrow gap submerged arc welding and narrow gap MIG welding. Due to the large heat input of these welding methods, the structure of the welded joint is relatively coarse, and the residual stress and deformation of the joint are large. [0003] Compared with the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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