Numerical Analysis for Aluminum Fused Coating Process with Arc Preheating

doi:10.7652/xjtuxb201812020

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Numerical Analysis for Aluminum Fused Coating Process with Arc Preheating

更新时间：2025-05-08

- Numerical Analysis for Aluminum Fused Coating Process with Arc Preheating
- Vol. 52, Issue 12, Pages: 137-144(2018)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201812020
  CLC： TG249.9
- Online First：10 December 2018，
  
  Published：2018
- 稿件说明：
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Numerical Analysis for Aluminum Fused Coating Process with Arc Preheating[J]. 2018, 52(12): 137-144.
DOI：

Numerical Analysis for Aluminum Fused Coating Process with Arc Preheating[J]. 2018, 52(12): 137-144. DOI： 10.7652/xjtuxb201812020.

摘要

针对金属熔融涂覆成形过程中铝合金铺展不充分的难点以及铝合金对激光吸收率低的问题

设计了惰性气体钨极保护焊电弧辅助预热的成形装置。基于有限差分法

采用Fortran语言自编程与Flow3D软件相结合的方式

分别建立了电弧热源对熔池产生的驱动力的单独作用模型以及耦合分析模型

并阐述了熔池内温度场和流场的演化过程。研究发现

当电流为200 A时

熔池内驱动力影响由大到小的排序为表面张力、电弧压力、洛伦兹力、拖曳力、浮力

该结果可为驱动力耦合作用时熔池内部流场方向的演化提供分析基础。对焊接熔池与喷头流出的高温液体之间的传热传质过程进行了计算

发现高温液体在表面张力与分子亲和力的作用下

接触熔池的瞬间快速流进熔池。将数值计算结果与实验结果进行对比得到

熔池的最大宽度及高度误差分别为1.1%、0.6%

热影响区的最大宽度及高度误差分别为9.3%和5.4%

单层单道件的最大宽度和高度误差分别为3.5%及2.1%

表明数值计算模型对成形过程的分析有较高的可信度。

Abstract

Aiming at the spreading difficulty and low energy absorptivity of aluminum alloy during fused coating process

the GTAW arc-preheating device is designed. With the finite difference method

separate action models and a coupling analysis model for the driving forces generated by the arc heat source on the molten pool are established

and the evolution process of the temperature field and flow field in the molten pool is described. It is found that in the case of 200 A current

the influences of the driving forces in descending order are surface tension

arc pressure

Lorenz force

drag force

and buoyancy force

and this result provides the basis for analyzing the evolution of the flow field inside the weld pool when the coupled driving force is applied. Liquid metal from the nozzle rapidly flows into the molten pool at the moment of contact under the influence of surface tension and molecular affinity. Comparison between the numerical and experimental results indicates that the maximum width and height errors of the molten pool reach 1.1% and 0.6%; the maximum width and height errors of heat-affected zone reach 9.3% and 5.4%; the maximum width and height errors of single-layer single-passage parts reach 3.5% and 2.1%.

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