All the part should be welded firmly.
所有部件必须焊接牢固。
It is permissible to change the specific make of filler material to another with the same compulsory part of the designation when an additional test piece is welded.
当焊接附加试件时，允许将专用类型的焊料改为另一种具有相同规定部分的焊料。
Connect the ground connection of the electric arc welding equipment as near as possible to the welding point on the part to be welded.
将电弧焊设备上的接地连接尽可能近地连接到将要焊接零件的焊接点上。
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