Minimum of three tack welds.

最少有三个点焊。

Factory and site welds.

工厂及现场焊接。

Iron welds easily.

铁易焊接。

Then before I primer it I will do the welds.

然后之前，我引它，我会做的焊缝。

All welds shall be undetectable in finished work.

完成设备的所有焊接应无法探察。