Dear Prasu, The simple answer read it carefully. Essential variable: The variable which affects the properties of the weld metal is known as essential variable. Change in essential variable requires requalification of PQR. Welding Technique is Non essential variable and hence will not affect the properties of the weld metal and no requalification of PQR is required. The DOT/DWT technique it will not affect the properties of the weld metal and hence Requalification of PQR is not required nor the welders Requalification required if welders are qualified for suitable position and thickness range of base metal. AS PER MY KNOWLEDGE Hope the answer to the question Regards ABDUL JABBAR KHAN normally for requalification of PQR the --- On Fri, 29/7/11, Prasu Cutie <pracuty@gmail.com> wrote:
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