排水罩风场特征及其对焊接电弧影响的数值模拟

发布时间：2018-11-26 07:58

【摘要】：水下焊接技术在水下工程建设和修复方面具有大量的应用需求.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,接头质量较好,易于实现水下自动化焊接.然而,局部干法焊接时需要在排水罩内通入高压空气将水排开.为了研究高压气体在排水罩内形成的风场结构及其对焊接过程和电弧特性的影响,文中采用数值模拟的方法,对排水罩内的湍流气体进行了模拟.并研究了排水罩内侧向风场对电弧等离子体的温度场、速度场、压力场的影响规律.发现侧向风场对弧柱中心区以外部分的影响较大,弧柱的吹偏角度与侧向风速基本上呈线性关系.最后进行了焊接试验,采用高速相机拍摄电弧在不同侧向风速下的形态,发现其实际变化与模拟结果基本一致.
[Abstract]:Underwater welding technology has a lot of application requirements in underwater engineering construction and repair. In the underwater welding method, the drainage cover is used to remove the water from the welding area, and the quality of the joint is good, which is easy to realize the underwater automatic welding. However, high-pressure air is required to drain the water in the drain hood during partial dry welding. In order to study the structure of wind field formed by high pressure gas in the drain hood and its influence on the welding process and arc characteristics, the turbulent gas in the drain hood was simulated by numerical simulation. The influence of the inner wind field on the temperature field, velocity field and pressure field of the arc plasma is studied. It is found that the lateral wind field has a great influence on the part outside the center of the arc column, and the angle of blowing deviation of the arc column is basically linear with the lateral wind speed. Finally, welding experiments were carried out, and the shape of the arc under different lateral wind speeds was photographed with a high-speed camera. It was found that the actual variation of the arc was basically consistent with the simulation results.
【作者单位】：南昌航空大学航空制造工程学院;
【基金】：国家自然科学基金资助项目(51465043)
【分类号】：TG456.5

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