QW-381.1(c)中的一句话，如何理解？

chgzh0101

这句话如何理解，是否可举个例子。

When specified as essential variables, the limitations of position and diameter qualified for groove welds shall apply to overlay welds, except the limitations on diameter qualified shall apply only to welds deposited in the circumferential direction.

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(c) The essential variables of QW-350 and QW-360
shall apply for welders and welding operators, respectively,
except there is no limit on the maximum thickness of corrosion‐resistant overlay that may be applied in production. When specified as essential variables, the limitations of position and diameter qualified for groove welds shall apply to overlay welds, except the limitations on diameter qualified shall apply only to welds deposited in the circumferential direction.

除了耐蚀堆焊最大焊缝金属厚度无限制外，QW350和360中的重要变素适用于焊工和操作工资格评定。如果对于坡口焊评定焊接位置和直径被规定为重要变素的情况下，也适用于堆焊评定，但是直径限制只在周向堆焊的情况下有效。

例如，一个管子外壁堆焊，你如果是绕着管轴线做环向堆焊，必须考虑直径限制，如果是焊道与管轴线平行，则无直径限制。