箱形截面构件薄壁板与内隔板电渣焊接时，易产生壁板烧穿和焊缝未熔合现象。
The weld defects of incomplete fusion and burn through always occur when the electro-slag welding is used between the outside thin metal plate and the inner clapboard in a box-section member.
粗糙表面的晶粒间易产生V形口，导致应力集中，降低了膜的断裂强度。
Rough surface is easy to generate V shape of stress concentration, which reduce fracture strength.
超薄反射镜具有重量轻的优点，但它极易受各种力学、热力学等环境的影响，因而其面形易发生变化。
Although a membrane mirror has a light weight, its surface is easily deformed due to certain mechanical and thermodynamic factors.
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