供热管道带水修复介质状态对活性TIG焊覆盖层的影响研究

Study on Influence of Medium State on A-TIG Welding Cover Layerduring Repair of Heating Pipeline with Water

供热管道带水修复,管道内的介质状态是影响修复效果的重要因素。通过搭建可调节管道介质压力和流动状态的试验装置,研究了利用活性TIG焊替代传统焊接方法对6 mm厚管道上的线性裂纹进行覆盖层焊接时,介质压力与流动状态对焊接效果的影响规律。结果表明,当介质压力较高时,熔池成型受介质压力影响,会导致二次泄露;当介质压力较低时,随着压力的减小,裂纹的熔合深度随之增加。常压带水状态下,可以将管壁裂纹的熔透,相比焊条电弧焊盖面,裂纹熔合深度有较大提升。静水静压状态下,裂纹熔合深度大于动水静压状态。动水动压状态下,裂纹的熔合深度随着介质压力的降低而增加。

When the heating pipeline is repaired with water,the state of the medium in pipeline is an important factor affecting the repair effect.By building a test device that can adjust the medium pressure and flow state in pipeline,the active TIG welding was used instead of the traditional welding method for cover welding of the linear crack on 6 mm thick pipeline,and the influence of the medium pressure and flow state on the welding effect was studied.The results show that when the medium pressure is high,the formation of molten pool is affected by the medium pressure,which can lead to secondary leakage;when the medium pressure is low,the fusion depth of the crack increases with the decrease of the pressure.Under the normal pressure with water,cracks on the pipeline can be penetrated.Compared with the electrode arc welding for covering,the crack fusion depth is greatly improved.Under the hydrostatic pressure state,the crack fusion depth is bigger than that under the hydrostatic pressure state.Under the state of hydrodynamic pressure,the crack fusion depth increases with the decrease of the medium pressure.