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左侧是技能评定时用的母材P-No.号,右侧是可焊接的母材P-No.号。标准上的原话是“When a base metal
shown in the left column is used for welder qualification ,the welder is qualified to weld all combinations of base metals shown in the right column , including unassigned metals of similar chemical composition to these metals .” 也就是说技能评定时用的左侧的任何一种母材能替代所有右侧的母材组合。但是技能 ...