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本文介绍了水下局部排水CO_2半自动焊接方法及其应用。分析了湿法水下焊接的主要问题是:可见度差、含氢量高、冷却速度快。而解决这些问题,是改善和提高湿法水下焊接质量的三个技术关键.概述了包括电源、水下送丝箱、焊枪在内的水下焊接设备的特点.特别是研究成功了一种特殊结构的焊枪。采用CO_2气体保护和局部排水的工艺,成功地解决了上述三个技术关键,使其接头质量达到了API 1104和ASME Ⅸ规程的要求。这套设备可以配合轻潜、重潜进行不同空间位置和不同接头型式的水下焊接,并成功的在13.5m 水深处,对采油平台的六根水下桩进行了水下焊接施工,效果满意,质量良好.
This paper introduces the semi-automatic submerged CO_2 welding method and its application. Analysis of the main problems of wet underwater welding is: poor visibility, high hydrogen content, cooling speed. Solving these problems is the key to improve and improve the quality of wet underwater welding.The paper summarizes the characteristics of underwater welding equipment, including power supply, underwater wire-feeding box and welding torch, especially the successful one Special structure of the welding torch. The technology of CO 2 gas protection and local drainage has successfully solved the above three key technical problems and made the quality of the joints meet the requirements of API 1104 and ASME Ⅸ regulations. The equipment can cooperate with light-duty snorkelling and dive into underwater welding in different spatial locations and different joint types. Under the water depth of 13.5m, underwater welding of six underwater piles of the oil-producing platform has been successfully carried out, with satisfactory results. Good quality.