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Method for establishing energy coupling self-consistent model for laser penetration welding

A self-consistent model, energy coupling technology, applied in laser welding equipment, welding equipment, simulators and other directions, can solve problems such as deviation

Inactive Publication Date: 2012-07-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The boundary of the small hole has always been the main action area of ​​the laser and the plasma, and the shape of the small hole is directly related to the area of ​​energy action, which is closely related to the conversion and coupling of energy, and should have a close relationship with the boundary of the heat source model, so , compared with the actual situation, these models still have obvious deviations

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  • Method for establishing energy coupling self-consistent model for laser penetration welding
  • Method for establishing energy coupling self-consistent model for laser penetration welding
  • Method for establishing energy coupling self-consistent model for laser penetration welding

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Embodiment Construction

[0015] The accompanying drawings disclose, without limitation, the structural schematic diagrams of the preferred embodiments involved in the present invention; the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] 1) Measure the power, power density, emission angle and spot diameter of the laser with relevant testing instruments, select a series of specific points in the molten pool and plasma area as the reference point temperature during the welding process, and measure and record these actual measured values ​​and the temperature of the material eigenvalues ​​of relevant physical properties; 2) calculated according to theory and combined with empirical formula φ ( Φ p ,φ H ,φ w ) value range, and set the initial value, and user-defined increment step size; 3) Calculate according to the empirical formula lambda ( lambda p ,λ L ) and set the initial value, and user-defined in...

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Abstract

The invention discloses a method for establishing an energy coupling self-consistent model for laser penetration welding. Compared with the existing point heat source model, plane heat source model and volume heat source model, the laser penetration welding model established by the method can more actually reflect the transmission and conversion of energy in the laser penetration welding process and is closer to an actual weld joint. Meanwhile, the model is also the self-consistent model and can be well applied to numerical simulation for analyzing the distribution of a plasma temperature field and the density of the laser penetration welding.

Description

technical field [0001] The invention relates to a method for establishing an energy conversion and heat transfer model in a laser penetration welding process, belonging to the field of welding numerical simulation. Background technique [0002] Numerical simulation technology of laser welding has become an important means to analyze laser welding thermodynamics, dynamic process and temperature field, stress field, deformation and structure prediction. The key to laser welding numerical simulation technology is to establish a reasonable energy conversion and heat transfer model. At present, the heat source models of laser deep penetration welding mainly include linear heat source, surface heat source, volume heat source model and composite heat source model combining point, line, surface and volume. Most of these models do not consider the energy conversion and coupling between laser and photoplasma, and do not consider the characteristics of the interaction between laser, p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B17/02B23K26/20B23K26/24
Inventor 沈以赴张盛海周小卫李博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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