A Method for Determining Parameters of Heat Source Model in Numerical Simulation of Single Wire Submerged Arc Welding

Abstract

The invention discloses a method for determining heat source model parameters of single wire submerged arc welding numerical simulation. The method comprises the following steps: I, establishing a double ellipsoid heat source model to obtain a heat flux density distribution function; II, establishing a finite element model to simulate a temperature field, and taking a set of welding voltage, welding current, welding speed and welding angle which is matched with single wire submerged arc welding as a base parameter of simulation to obtain a set of appropriate double ellipsoid heat source model parameters based on experimental results; III, adjusting the double ellipsoid heat source model parameters obtained in step II by 10%, and implementing finite element numerical simulation on each parameter combination to obtain multiple sets of sample values of weld width and weld penetration so as to determine sensitivity equations of the double ellipsoid heat source model parameters and the welding speed to the weld width and weld penetration; IV, ignoring the parameters that affect the sensitivity equations slightly to obtain the simplified sensitivity equation; and V, promoting and verifying the equations. Compared with a traditional method for artificially searching the heat source model parameters, the method disclosed by the invention is high in efficiency and can be used for greatly reducing the calculating time.

Description

technical field [0001] The invention belongs to the technical field of welding numerical simulation heat source models, and in particular relates to a method for determining parameters of single wire submerged arc welding numerical simulation heat source models. Background technique [0002] Submerged arc welding (including submerged arc surfacing and electroslag surfacing, etc.) is a method in which the arc burns under the flux layer for welding. Its inherent advantages such as stable welding quality, high welding productivity, no arc light and little smoke make it the main welding method in the manufacture of important steel structures such as pressure vessels, pipe section manufacturing, and box-shaped beams and columns. In recent years, although many new welding methods with high efficiency and high quality have appeared successively, the application field of submerged arc welding has not been affected in any way. [0003] The welding process is a dynamic process at hig...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for determining the parameters of the heat source model in the numerical simulation of single-wire submerged arc welding, and to solve the problem of large amount of calculation and low precision in determining the parameters of the heat source model in the prior art question

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