High-frequency laser pulse method applied to dissimilar metal composite heat source welding

A dissimilar metal and laser pulse technology, applied in welding equipment, metal processing equipment, laser welding equipment, etc., can solve problems such as poor symmetry, low flatness, and poor mechanical properties, so as to prevent stress concentration, compensate for deformation imbalance, and improve reliability effect

Active Publication Date: 2021-03-19
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the technical bottlenecks of low flatness, poor symmetry and poor mechanical properties of the current dissimilar metal composite heat source welding weld joints

Method used

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  • High-frequency laser pulse method applied to dissimilar metal composite heat source welding
  • High-frequency laser pulse method applied to dissimilar metal composite heat source welding
  • High-frequency laser pulse method applied to dissimilar metal composite heat source welding

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Embodiment

[0039] The Nd:YAG solid-state continuous laser is used as the welding heat source, and the nanosecond pulse laser is used as the high-frequency pulse laser heat source. The power of the continuous laser is 1500W, the diameter of the spot is 3mm, the traveling speed is 4mm / s, the pulse energy of the nanosecond pulsed laser is 2J, the diameter of the pulse spot is 1.3mm, the pulse frequency is 5Hz, and the center of the spot of the pulsed laser coincides with the center of the spot of the continuous laser. figure 2 It is a schematic diagram of the effect comparison of the present invention. White light interferometer is used to characterize the three-dimensional morphology of the weld joint with or without the action of pulsed laser: when pulsed laser is not used, under high energy density laser irradiation, the material melts to form a molten pool, and the melt fluctuates inside the molten pool , with the movement of the laser heat source, the melt in the molten pool condenses...

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Abstract

The invention discloses a high-frequency laser pulse method applied to dissimilar metal composite heat source welding. Through high-frequency pulse laser beam intervention, disturbance force in a molten pool can be increased, the Marangoni convection effect is enhanced, heat and mass transfer in the molten pool is accelerated, and uniform distribution of elements in the molten pool is achieved; aweld joint is shaped by directly or indirectly intervening a weld seam pool through a high-frequency pulse laser beam, weld seam grains can be refined, and a flat joint morphology which is symmetrically distributed along the center line of a weld seam is obtained; deformation maladjustment caused by difference of thermophysical performance parameters of dissimilar metal materials can be made up, so that the effect of intervening weldments in different time scales and space scales is achieved, and the reliability of dissimilar metal weld seam joints is improved; and the phenomenon of stress concentration induced by asymmetric distribution of pore and microcrack defects can be effectively prevented, and then the comprehensive mechanical property of the dissimilar metal weld seam joints is improved.

Description

technical field [0001] The invention relates to the technical fields of welding, additive manufacturing and surface modification, in particular to a high-frequency laser pulse method applied to the welding of dissimilar metal composite heat sources. Background technique [0002] In order to meet the engineering requirements of different functional characteristics in different areas of the same structural part of the new power plant, the structural parts need to be welded by dissimilar metals. However, compared with metal weldments with the same material properties, there are often more complex multi-physics coupling mechanisms in the welding process of dissimilar metals, such as material phase transition, pinhole effect and plasma effect. In addition, due to the differences in the thermal expansion coefficients of different metal materials, there is often an excessive thermal mismatch between dissimilar metals during welding, which will lead to asymmetric distribution of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/0622B23K26/24B23K26/70
CPCB23K26/0622B23K26/24B23K26/702
Inventor 胡耀武张啸寒
Owner WUHAN UNIV
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