压力水管常常受到由于水锤所引起的震动动力荷重,而此种水锤是在水电站的负荷变化时发生的。因此,在制造及安装压力水管时,对焊接工作施工质量的要求就特别高。 当工作量很大时,如果采用手工焊接,那末除了生产率很低以外,而且往往不能保证焊缝的质量良好,因为在这种情况下,焊缝质量的高低完全取决于焊接工人的经验。 Pressure pipes are often subject to shock loads due to water hammer, which occur when the load on a hydropower station changes. Therefore, in the manufacture and installation of pressure pipes, the quality of the welding work requirements are particularly high. When heavy work load is used, manual welds, except for very low productivity, often do not guarantee good weld quality because weld quality in this case depends entirely on the experience of the welder.