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。
3
Connect the ground connection of the electric arc welding equipment as near as possible to the welding point on the part to be welded.