The processes of preheating and welding of super scale penstocks were detailed.

本文详细叙述了巨型压力钢管的预热装配和焊接过程。

youdao

Steel surface should be no visible grease and dirt, and there is no attachment not firm scale, rust, paint and other impurities (water soluble salt and welding residue).

钢材表面应无可见的油脂和污物，并且没有附着不牢的氧化皮、铁锈和油漆涂层及其它杂质（水溶性盐和焊接残渣）。

youdao

The thesis aims to develop a micro-vibration platform using Giant Magnetostrictive Vibrator (GMV), which is expected to improve the vibrating force and frequency scale of vibration welding technic.

针对振动焊接中激振器的激振力不大、频带不宽等缺陷，本文研制了一种以超磁致伸缩激振器为执行元件的微振动平台。

youdao