Calculation method for simulating impact effects caused to molten pools by molten drops in laser arc hybrid welding

A hybrid welding and laser arc technology, which is applied in laser welding equipment, computing, welding equipment, etc., can solve the problems of low accuracy in calculating short-circuit transition and jet transition

Active Publication Date: 2018-01-19
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The accuracy of traditional methods for calculating short-circuit transition and jet transition is not high

Method used

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  • Calculation method for simulating impact effects caused to molten pools by molten drops in laser arc hybrid welding
  • Calculation method for simulating impact effects caused to molten pools by molten drops in laser arc hybrid welding
  • Calculation method for simulating impact effects caused to molten pools by molten drops in laser arc hybrid welding

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Embodiment Construction

[0041] like figure 1 As shown, the calculation method for simulating the impact of droplets on the molten pool in hybrid laser arc welding in an embodiment of the present invention is characterized in that the impact of droplets on the molten pool is divided into three types: momentum impact, mass addition and energy addition. Aspects, and then sorted into corresponding mathematical functions for calculation, and finally obtained the surface deformation, temperature and velocity distribution of the molten pool under the impact of the droplet, the processing steps are as follows:

[0042] Step 1. According to the state information of the current welding wire, organize it into a function P d (x,y) to represent the momentum impact of the droplet, and then the function P d (x,y) is added to the surface equation of the melt pool.

[0043] where the function P d (x,y) can be obtained as follows:

[0044] Step 11, set the volume of the welding torch wire feeding per unit time as ...

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Abstract

The invention provides a calculation method for simulating impact effects caused to molten pools by molten drops in laser arc hybrid welding. The method comprises the following steps of: dividing an impact effect caused to a molten pool by molten drops into three aspects of momentum impact, quality addition and energy addition; respectively arranging the three aspects into corresponding mathematicfunctions to carry out calculation; and finally obtaining surface deformation and temperature and speed distribution states of the molten pool under the impact of the molten drops. According to the method, a free interface tracking method which takes volume conservation as a constraint condition is utilized, so that surface deformation and temperature field and speed field distribution conditioncalculation of molten pools under the impact of molten drops can be realized. The method is capable of efficiently and correctly calculating influences caused to molten pool dynamics by impact of molten drops, and has a great significance to scientific research and engineering design.

Description

technical field [0001] The invention relates to the field of welding, in particular to a numerical calculation method of droplet impact for droplet transfer under conditions such as high transition frequency and irregular droplet shape. Background technique [0002] Due to the complex physical process of laser-MIG hybrid welding, the heat transfer and flow of the molten pool cannot be effectively observed by experimental means, so it is necessary to numerically simulate the molten pool behavior under the impact of droplets. During the welding process, the droplet detaches from the end of the welding wire and transitions into the molten pool at a certain frequency, and the molten droplet transitions into the molten pool, which brings additional mass, momentum and energy to the molten pool, and impacts the molten pool to make the molten The surface of the pool is severely deformed, which greatly affects the heat transfer and flow of the molten pool. The traditional numerical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B23K26/348
Inventor 虞钢陈旭阳何秀丽郑彩云李少霞宁伟健
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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