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。
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。
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