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在水下焊接方法中,局部干法焊接采用排水罩将焊接区域的水排开进行焊接,接头质量容易保证,无需大型排水设备,易于实现水下焊接自动化。然而,横向焊接时熔池在重力作用下产生下榻,影响焊缝成形。局部干法水下横向焊接时,通过优化排水罩结构,使排水罩内高压气体在排水的同时,产生稳定向上的风场吹袭熔池,抑制熔池下淌,并将焊接产生的烟雾迅速带出排水罩,将大幅提高焊接质量。文中采用数值模拟的方法,研究了排水罩内的湍流气体的风场结构,优化了微型排水罩进气口位置、内部结构。研究发现:由端面进气,在排水罩内加挡板,并采用多孔隔板时可以产生理想的风场。
In the underwater welding method, the local dry welding adopts the drainage hood to weld the water in the welding area for welding, the quality of the joint is easy to be ensured, the large-sized drainage equipment is not needed, and the underwater welding is easy to be automated. However, the horizontal weld pool under the action of gravity produced stay, affect the weld shape. Local dry underwater welding, through the optimization of the drainage hood structure, so that the high-pressure gas in the drainage hood in the drainage at the same time, produce a stable upward wind blowing pool, inhibit the pool drip, and welding smoke quickly A drainage hood, will greatly improve the quality of welding. In this paper, the numerical simulation method is used to study the wind field structure of the turbulent gas in the drainage hood, and to optimize the position and internal structure of the intake port of the miniature drainage hood. The study found that: from the end of the intake, the baffle in the drain cover, and the use of porous partitions can produce the ideal wind field.