Orthogonal test and analysis of carbon steel spot welding for rail vehicles

ZHAO Guoxin; ZHANG Yong; WANG Ting; ZHAO Xiaofei

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Orthogonal test and analysis of carbon steel spot welding for rail vehicles
Vol. 49, Issue 5, Pages: 100-103(2019)
Published：2019
DOI：
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DOI：

ZHAO Guoxin, ZHANG Yong, WANG Ting, et al. Orthogonal test and analysis of carbon steel spot welding for rail vehicles[J]. Eletric Welding Machine2019, 49(5): 100-103. DOI：

摘要

采用正交试验法对Q345D碳钢电阻点焊进行参数优化实验分析。通过对点焊强度影响较大的点焊参数(焊接电流、焊接时间和电极压力)进行单因素分析

得到焊接参数对点焊拉伸强度的影响规律

获得点焊参数的工艺窗口。在单因素分析基础上确定三因素三水平正交试验参数进行点焊实验

以点焊拉伸强度为评价指标对正交试验结果进行极差和方差分析

得到Q345D点焊的最佳工艺参数:焊接时间25CYC

焊接电流12 k A

电极压力9 kN。

Abstract

Orthogonal test is used to optimize the resistance spot welding parameters of Q345 D carbon steel. Through single factor analysis of welding current

welding time and electrode pressure which have great influence on spot welding strength

the rule of influence of welding parameters on tensile strength of spot welding is obtained

and the procedure window of spot welding parameters is gained. On the basis of single factor analysis

three factors and three levels orthogonal test parameters are determined to conduct spot welding experiments. The range and variance analysis of the orthogonal test results are carried out by using the tensile strength of spot welding as the evaluation index. The optimum parameters of Q345 D spot welding are gained as follows: welding time of 25 CYC

welding current of 12 kA and electrode pressure of 7.5 kN.