1、Special welding equipment must be developed, to achieve Cu-Al pipe weldment in high quality.
為實現(xiàn)銅-鋁管的優(yōu)質(zhì)焊接，需要研制相應(yīng)的焊接設(shè)備。

2、It is more usual to complete the weldment first and then to galvanize it.
所以常用的方法是先把鋼板焊起來再鍍鋅。

3、The application of weldment and its economic efficiency is also described.
并闡述了焊接件的應(yīng)用及其經(jīng)濟效益。

weldment翻譯