Influence of thickness of flange plate on the reduction of angular distortion by welding with trailing reverse-side flame line
Influence of thickness of flange plate on the reduction of angular distortion by welding with trailing reverse-side flame line
复制标题
法兰板厚度对尾随反面火线焊接减少角变形的影响
DOI：
10.1080/09507116.2017.1346842
复制
发表时间：
2018
影响因子：
--
通讯作者：
T. Tsuyama and M. Mochizuki
中科院分区：
文献类型：
--
作者：
Y. Kotani;S. Okano;T. Tsuyama and M. Mochizuki
在钢桥制造中，角焊T型接头应用广泛，经常产生角变形。因此，在不增加焊接工艺的情况下减少或控制角变形是非常必要的，因为校正角变形需要花费大量的时间和精力。本文通过焊接试验和数值模拟，研究了三种不同厚法兰板T型角接头埋弧焊过程中，火焰线加热焊对防止角变形的有效性。首先，通过与实测温度历史和角变形的比较，建立了埋弧焊和火焰线加热数值分析的热源模型。然后，将这些热源模型与不同的两个热源之间的距离相结合，得出了角变形最小的合适距离条件为150 mm，且不依赖于法兰厚度。同时也证实了实验得到的角变形与计算值吻合较好。重点研究了翼缘板厚度对焊接角变形的影响，随着翼缘板厚度的增加，焊后反面火焰线加热对角变形的减小率变小。但在适当的火焰线加热条件下，由于焊接角变形也随着翼缘板厚度的增加而变小，所以在适当的火焰线加热条件下，可以很好地防止角变形。因此，对于钢桥构件角T形接头，采用反向火焰线加热焊接可以有效地防止角变形，而不足以在焊接后纠正其变形。
In manufacturing of the steel bridge, fillet welded T-joint is widely used and angular distortion is often generated. So, reduction or control of angular distortion without additional processes to welding is strongly demanded because it takes great time and effort to correct the angular distortion. In this study, the effectiveness of welding with trailing reverse-side flame line heating for preventing angular distortion was investigated through the welding experiment and numerical simulation in submerged arc welding of fillet T-joint with three different thick flange plate. First, the heat source models for numerical analysis of both submerged arc welding and flame line heating were constructed based on the comparison with the measured temperature histories and angular distortion. And then, these heat source models were used in combination with various kinds of distance between two heat sources to make clear the appropriate distance condition for smallest angular distortion was 150 mm, and it does not depend on thickness of flange plate. It was also confirmed that the experimental angular distortions were in good agreement with those calculated. With a focus on the influence of thickness of flange plate, the reduction of angular distortion by welding with trailing reverse-side flame line heating becomes smaller with increasing thickness of flange plate. However, angular distortion could be adequately prevented under the appropriate flame line heating condition in either thickness of flange plate because the welding-induced angular distortion also becomes smaller with increasing thickness of flange plate. Thus, it was concluded that welding with trailing reverse-side flame line heating could be useful for preventing angular distortion of fillet T-joint, which is a component of steel bridge, enough not to correct it after welding.