Thermal conduction theoretical analysis of temperature distribution during multiple-electrode submerged arc welding
Thermal conduction theoretical analysis of temperature distribution during multiple-electrode submerged arc welding
复制标题
多电极埋弧焊温度分布的热传导理论分析
DOI：
10.1080/09507116.2012.715882
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
N. Ishikawa
中科院分区：
文献类型：
--
作者：
Nobuhisa Ochi;Shigetaka Okano;M. Mochizuki;J. Shimamura;N. Ishikawa
近年来，为了降低管道的运输和建设成本，管道通常使用多电极埋弧焊（SAW）来建造，对接头性能提出了更高的要求。因此，有必要从理论上了解和控制适当的热影响区（HAZ）的冶金和力学特性，这对焊接接头的强度和韧性有显着的影响。通常，热影响区的冶金现象是根据最高温度和冷却速度来评价的。因此，为了通过焊接条件控制HAZ的冶金和机械特性，评估熔化区附近的温度分布和温度历史是必要的。然而，多电极SAW的温度分布的详细调查还没有进行足够的。在这项研究中，为了研究多电极SAW过程中的温度分布和历史，实验结果与理论结果进行了比较。在理论分析中，采用求和法建立了多热源焊接的温升方程。此外，通过热传导理论分析，定量地考虑了多热源对焊接过程中温度分布的影响，如热源数量、电极间距等。结果表明，在单热源焊接和多热源焊接中，铅热源和末热源的距离对焊接面积的影响最大。根据计算结果，提出了采用合理的热输入来控制熔化区附近的温度分布，这取决于热源的布置方式。
In recent years, in order to reduce the costs of transportation and construction of pipelines, which are often constructed using multiple-electrode submerged arc welding (SAW), higher joint performance is required. Therefore, there has arisen the need to understand theoretically and control appropriately metallurgical and mechanical characteristics in heat-affected zone (HAZ), which has a significant influence on the strength and toughness of welded joints. Commonly, metallurgical phenomena in HAZ are evaluated based on the highest temperature and the cooling rate. Therefore, in order to control metallurgical and mechanical characteristics in HAZ by means of the welding conditions, evaluating the temperature distribution and the temperature history near the melted zone is essential. However, a detailed investigation of the temperature distribution for multiple-electrode SAW has not yet been carried out enough. In this study, in order to investigate the temperature distribution and histories during multiple-electrode SAW, the experimental results are compared with the theoretical results. In the theoretical analysis, the temperature rise equation in multiple heat sources welding is developed using the method of summation. Furthermore, on temperature distribution during welding, the effects of multiple heat sources, such as the number of heat sources and the distance between each electrodes, are considered quantitatively through the thermal conduction theoretical analysis. As the result, the distance between lead heat source and final heat source primally influences the area with the difference between a single heat source welding and multiple heat sources welding. Based on the results, it is expected to control temperature distribution near melted zone by more appropriate heat input characteristics, which is depended on heat source arrangement.