|Table of Contents|

Numerical simulation of EBW pool fluid flow field(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2015年01期
Page:
98-104
Research Field:
工艺与材料
Publishing date:

Info

Title:
Numerical simulation of EBW pool fluid flow field
Author(s):
WANG Kun1;  CAI Qiang-shun2
1. Xi’an Bureau, Naval Equipment Department of China, Xi’an 710065, China 2. Xi’an Space Engine Factory, Xi’an 710100, China
Keywords:
electron beam welding;  flow field;  heat source model;  316L stainless steel
PACS:
V434-34
DOI:
-
Abstract:
Gauss area and rotary Gauss decay body hybrid heat source model was established based on the seam feature of nail-shaped electron beam welding (EBW). The weld pool fluid flow field in EBW was simulated numerically with the finite element software ANSYS FLOTRAN CFD. The vortex flow of liquid-state metal in weld pool under temperature field, interaction among electron beam, weld pool and liquid-state metal vapor, electron beam keyhole effect and energy transmission pattern of keyhole wall as well as liquid-state metal flow mechanism along welding penetration were investigated. The welding specifications (60 kV accelerating voltage, 30 mA electron beam current and 8 mm/s welding speed) of 316L stainless steel were obtained by simulation calculation and solution that inputs thermophysical properties of 316L stainless steel into hybrid heat source model. Applying the above specifications, the welded joint tensile strength of 316L stainless steel specimen reached 425 MPa, which satisfys the design requirement. The comparison result of simulated weld shape and actual weld shape indicates that numerical calculation results is in accordance with actual testing results, which proves the validity and applicability of the heat source model.

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