Purpose

The purpose of this paper is to quantitatively investigate the effect of process parameters (including welding current, voltage and speed) and plate thickness on in-plane inherent deformations in typical fillet welded joint; meanwhile, the plastic strains remaining in the weld zone are also analyzed under different influencing factors.

Design/methodology/approach

To achieve the purpose of this study, a thermal-elastic-plastic finite element (TEP FE) model is developed to analyze the thermal-mechanical behavior of the T-welded joint during the welding process. Experimental measurements have verified the validity of the established TEP FE model. Using the effective model, a series of numerical experiments are performed to obtain the inherent deformations under the conditions of different influencing factors, and then the calculation results are discussed based on the relevant data obtained.

Findings

Through numerical simulation analysis, it is found that the longitudinal and transverse inherent deformations decrease with the increase of welding speed and plate thickness, whereas as the nominal heat input increases, the inherent deformations increase significantly. The longitudinal shrinkage presents a quasi-linear and nonlinear distribution in the middle and end of the weld, respectively. The plastic strains in the cross section of the T-joint also vary greatly because of the process parameters and plate thickness, but the maximum value always appears near the location of the welding toe, which means that this point faces a relatively large risk of fatigue cracking. The inherent deformations are closely related to the plastic strains remaining in the weld zone and are also affected by many influencing factors such as process parameters and plate thickness.

Research limitations/implications

In this study, relatively few influencing factors such as welding current, voltage, speed and plate thickness are considered to analyze the inherent deformations in the T-welded joint. Also, these influencing factors are all within a certain range of parameters, which shows that only limited applicability can be provided. In addition, only in-plane inherent deformations are considered in this study, without considering the other two out-of-plane components of inherent deformations.

Originality/value

This study can help to expand the understanding of the relationship between the inherent deformations and its influencing factors for a specific form of the welded joint, and can also provide basic data to supplement the inherent deformation database, thereby facilitating further researches on welding deformations for stiffened-panel structures in shipbuilding or steel bridges.

中文翻译：

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T型角焊缝工艺参数和板厚对面内固有变形的影响

目的

本文的目的是定量研究工艺参数（包括焊接电流、电压和速度）和板厚对典型角焊缝面内固有变形的影响；同时，还分析了不同影响因素下焊缝区残留的塑性应变。

设计/方法/方法

为实现本研究的目的，开发了热弹塑性有限元 (TEP FE) 模型来分析 T 型焊接接头在焊接过程中的热机械行为。实验测量验证了所建立的 TEP FE 模型的有效性。利用有效模型进行一系列数值实验，得到不同影响因素条件下的固有变形，然后根据得到的相关数据讨论计算结果。

发现

通过数值模拟分析发现，纵向和横向固有变形随着焊接速度和板厚的增加而减小，而随着标称热输入的增加，固有变形显着增加。纵向收缩在焊缝中部和端部分别呈现准线性和非线性分布。T型接头横截面的塑性应变也因工艺参数和板厚的不同而变化很大，但最大值总是出现在焊趾位置附近，这意味着该点面临相对较大的疲劳风险开裂。

研究限制/影响

本研究仅考虑相对较少的焊接电流、电压、速度和板厚等影响因素来分析 T 型焊接接头的固有变形。而且，这些影响因素都在一定的参数范围内，只能提供有限的适用性。此外，本研究仅考虑面内固有变形，不考虑固有变形的其他两个面外分量。

原创性/价值

该研究有助于加深对特定焊接接头形式固有变形及其影响因素之间关系的认识，也可以为补充固有变形数据库提供基础数据，从而促进加筋焊接变形的进一步研究。 -造船或钢桥中的面板结构。