Study of welding deformation and residual stresses in T-joint laser welding

SONG Sheng; LI Bingxue; WAN Bin; LU Hao

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Study of welding deformation and residual stresses in T-joint laser welding
Vol. 48, Issue 10, Pages: 54-60(2018)
Published：2018
DOI：
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DOI：

SONG Sheng, LI Bingxue, WAN Bin, et al. Study of welding deformation and residual stresses in T-joint laser welding[J]. Eletric Welding Machine2018, 48(10): 54-60. DOI：

摘要

三明治板结构简单、质量较轻、强度较高

在船舶行业具有广阔的应用前景

而采用高功率激光穿透焊来制造钢结构三明治板已成为三明治结构钢板的首选。T型接头是三明治结构基本的焊接单元

搭建了基于激光焊接的T型接头焊接平台

在试验基础上

提出了混合热源模型

准确描述了激光焊接过程中的热流分布状态。通过激光焊接试验和有限元仿真

分析三明治结构的焊接变形和残余应力分布

并探讨T型接头激光穿透焊焊接变形和残余应力的影响因素。结果发现

采用激光焊接能够显著减小焊接变形

但不能有效降低残余应力。

Abstract

As the sandwich panel structure is simple and relatively lighter with considerable strength

it has great application prospect in the shipbuilding industry. Using the laser welding to fabricate the steel sandwich panel is the preferred manufacturing technology.As the T-joint structure is the base welding unit of the sandwich structure

this paper has set up a T-joint welding platform based on laser welding. On the basis of the experimental results

a new mixed heat source model was proposed. The heat flux distribution during laser welding could be accurately described by the mixed heat source model. Through laser welding experiment and FEM calculation

the welding deformation and residual stresses of the sandwich structure were analyzed. Besides

the influence factors on the welding deformation and residual stresses were also discussed

finding that the welding deformation was significantly decreased by using laser welding

but the residual stress was still at high level.