have completed zirconium welding 这句怎么理解? all welders and weld operators shall be re-qualified and a record of the qualification test shall be received by the contractor prior to the start of welding by each welder. this requirement may be reviewed if it can be demonstrated, to the satisfaction of the contractor, that the nominated welders and weld operators have completed zirconium welding during a one month period prior to the start of production welding. 所有焊工与焊接操作工都应重新进行资格评定，且其 评定试验的记录 应在其施焊前交给承包商。 承包商可对此项要求进行审查，看其是否能证明指定的焊工与焊接操作工在开始产品焊接 之前的一个 月期间已完成锆焊接 。 微乎其微的改动，for your reference only! 查看更多
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