影响核设备焊接质量坡口现场加工工艺研究

Research on on-site processing technology of grooves affecting welding quality of nuclear equipment

针对核电维修现场镍基合金焊缝切割及坡口加工需要,设计了一种便携式焊缝切割装置,装置采用铣削原理和数控技术实现现场焊缝的快速切割及坡口加工,采用风冷技术解决了现场不允许使用冷却液的刀具冷却问题,通过试验验证了装置的结构设计合理,可应用于现场。针对镍基合金焊缝坡口技术要求,开展坡口加工工艺研究,设计坡口根部R1倒角坡口的加工和15°角度坡口两种加工工艺,通过合理设置刀具材料、加工工艺参数开展工艺试验,重点观察两种工艺方案的加工精度、加工平稳性和刀具磨损,确定最优工艺方案和工艺参数。

Aiming at the requirement of nickel-based alloy weld cutting and groove processing in nuclear power maintenance site,a portable weld cutting device is designed. The device adopts milling principle and numerical control technology to realize rapid cutting and groove processing of weld in site. The problem of tool cooling which is not allowed to use coolant in site is solved by air-cooling technology. The structure design of the device is reasonable through experiments. It can be used in the field. According to the technical requirements of nickel-based alloy weld groove,the groove processing technology was studied and two kinds of processing technology were designed. They are the processing of the groove root R1 chamfer groove and the processing of 15°angles. The process test was carried out through the reasonable setting of cutting tool materials and processing parameters. The processing accuracy,processing stability and tool wear of the two process schemes were mainly observed and determined through the test. The optimum technological scheme and process parameters were obtained.