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Determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation

A technology of multi-wire submerged arc welding and heat source model, which is applied in arc welding equipment, electrical digital data processing, welding equipment and other directions, and can solve problems such as difficulty in determining heat source parameters.

Inactive Publication Date: 2014-09-10
CNPC BOHAI EQUIP MFG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to better use the finite element software to analyze the change of the heat process of multi-wire submerged arc welding, solve the problem that the heat source parameters in the multi-wire submerged arc welding heat source model are difficult to determine, and provide a multi-wire submerged arc welding heat source Parameter determination method

Method used

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  • Determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation
  • Determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation
  • Determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation

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Experimental program
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Embodiment

[0035] Step 1: Determine the parameter U of the heat source model i , I i , V, n, α i , Τ i , Η i

[0036] Welding specification parameter table

[0037]

[0038] Directly determined by welding specification U i , I i , V, n, α i , Τ i By formula S i / v is calculated, where S i Is the distance between i wire and 1 wire, considering the influence of working conditions, η i For the thermal efficiency of submerged arc welding, 0.9 is taken in this embodiment.

[0039] The heat flux density at position (x, y, z) at time t is:

[0040] q ( x , y , z , t ) = X i = 1 4 6 3 f f i , bi η i U i I i a ( f i , b i ) b i c i π π exp { - 3 [ ( x 2 b i 2 ) + ( ( y + v ( τ i - t ) 2 ( a ( f i , b i ) cos α i ) 2 ) + ( z 2 ( c i cos ...

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Abstract

The invention discloses a determination method for heat source model parameters in multiplewire submerged-arc welding by numerical simulation. The determination method comprises the following steps of: determining a heat-flow density distribution function in the multiplewire submerged-arc welding process; initially determining the heat source model parameters, wherein the heat source model parameters to be determined includes Ui, Ii, v, n, taui, etai, alphai, f<fi>, bi, ci, a<fi>, and a<bi>; and finally determining a heat-source model, wherein the determined parameters are substituted into the heat-flow density distribution function q(x, y, z, t) which is then taken as a thermology boundary condition for repeated iterative computations by a numerical simulation tool, the computation result of iterative computation of each time is compared with the shape of a joint fusion pool obtained by actual welding, the heat-source model parameters bi, ci, a<fi>, a<bi> are gradually adjusted by a range of 5% according to the comparison results until the errors between the parameters of the fusion depth and the fusion width of a simulated fusion pool and the fusion depth and the fusion width of the actual joint fusion pool are smaller than 10%, and then the determination of the heat-source model parameters in the multiplewire submerged-arc welding is finished.

Description

Technical field [0001] The invention relates to a numerical simulation calculation method for the temperature field of a multi-wire submerged arc longitudinal seam welded pipe, and proposes a method for quickly determining the parameters of a multi-wire submerged arc welding heat source model combined with a production process, which is specifically used for the rapid thermal process of multi-wire submerged arc welding Calculation can also evaluate the welding process through numerical simulation results, which plays an important role in engineering applications. Background technique [0002] Multi-wire submerged arc welding technology is a key technology in the production of longitudinally welded pipes. The optimization and control of welding process parameters is not only a key factor affecting the performance of welded joints, but also an important factor affecting the manufacturing cost of welded pipes and improving production efficiency. The rapid development of computer tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50B23K9/095
Inventor 王旭赵波张红杨玮玮韩秀林刘涛刘广川胡海朝杨新岐孙灵丽
Owner CNPC BOHAI EQUIP MFG
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