帮忙看一下？ 1.in addition to the provisions of the applicable codes the validity of the pqr is five years from issue date and the following essential variables, if modified from what qualified during the procedure qualification record as indicated in the following tables, require the welding qualification tests to be repeate． 除了适当的规范规定外,pqr从发布日起五年有效,以下关键变量,如果经修改不同于pqr,如下表所示, 要求重新焊接资格试验. 2.a change in the welding position (a pqr done in 3g-5g-6g-vertical-uphill progression qualify all other position except vertical-down progression) 焊接位置的变化(3g-5g-6g垂直向上焊接工艺的pqr可代表其它位置,除了垂直向下焊接工艺)查看更多
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