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。
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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).
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.