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High Frequency Laser Pulse Method Applied to Dissimilar Metal Composite Heat Source Welding

A dissimilar metal, laser pulse technology, applied in welding equipment, metal processing equipment, laser welding equipment and other directions, can solve the problems of poor mechanical properties, low flatness, poor symmetry, etc., to prevent stress concentration, enhance convection effect, compensate for The effect of deformity

Active Publication Date: 2022-02-08
WUHAN UNIV
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  • Summary
  • 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 continuous laser is used as a welding heat source, and the nanosecond pulse laser is used as a high-frequency pulse laser heat source. The continuous laser power is 1500W, the spot diameter is 3 mm, the travel speed is 4mm / s, the nanosecond pulse laser pulse energy is 2J, the pulse spot has a diameter of 1.3 mm, the pulse frequency is 5 Hz, and the pulsed laser spot is coincident with the central convergence laser spot. figure 2 A comparative diagram of the effects of the present invention. The three-dimensional shape of the weld joint when the white light interferometer is used: When the pulsed laser intervention is not used, the material is melted under the laser irradiation of high energy densities, and the melt is fluctuated inside the molten pool. With the movement of the laser heat source, the molten pool melt is condensed, a weld having a raised morphology is formed; under the action of the pulsed laser shock wave, the melt in the molten tank is s...

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Abstract

The invention discloses a high-frequency laser pulse method applied to heterogeneous metal compound heat source welding. The invention intervenes with high-frequency pulsed laser beams to increase the disturbance force inside the molten pool, enhance the Marangoni convection effect, accelerate the heat and mass transfer inside the molten pool, and realize the uniform distribution of elements in the molten pool; through the high-frequency pulsed laser The welding seam joint can be shaped by directly or indirectly interfering with the weld pool, which can refine the grain of the weld seam and obtain a flat joint shape symmetrically distributed along the center line of the weld seam; The deformation imbalance caused by the difference, so as to achieve the intervention effect on different time scales and spatial scales of the weldment, improve the reliability of the weld joints of dissimilar metals; it can effectively prevent the stress concentration caused by the asymmetric distribution of pores and micro-crack defects, In turn, the comprehensive mechanical properties of dissimilar metal welded joints can be improved.

Description

Technical field [0001] The present invention relates to welding, surface modification and additive manufacturing technical field, particularly relates to a method applied to high frequency laser pulses hybrid welding of dissimilar metals. Background technique [0002] In order to meet the new power different functional characteristics in different regions of the same structural member engineering requirements, the structure requires the use of dissimilar metal welded together. However, the metal weldment properties compared to the same type of material, the dissimilar metal welding operation process, there is often a more complex multi-physics coupling mechanism, such as a phase change material, and keyhole plasma effect. Furthermore, since there is a difference of thermal expansion coefficients of different metallic materials, the dissimilar metal welding between there is often excessive thermal mismatch which would result in non-asymmetric distribution element and the bath medi...

Claims

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Application Information

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Patent Type & Authority Patents(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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