WPS Requalification API 1104
WPS Requalification API 1104
(OP)
Gents
I wonder how to interpret the changes on the essentials variables which require the requalification of the WPS. For instance: Statements like "Major increase" of flow rate; An "Increase" of time between passes; A "change" in the speed travel; A "decrease" of the minimum pre heat temperature. It is not specified a value. When should I consider a major change????? If time between passes "Increase" 1 seg, or the Pre-heat temp "decrease" 1°C should the WPS be requalified?? of course I am exaggerating.
I appreciate any suggestion
Regards
Miguel
I wonder how to interpret the changes on the essentials variables which require the requalification of the WPS. For instance: Statements like "Major increase" of flow rate; An "Increase" of time between passes; A "change" in the speed travel; A "decrease" of the minimum pre heat temperature. It is not specified a value. When should I consider a major change????? If time between passes "Increase" 1 seg, or the Pre-heat temp "decrease" 1°C should the WPS be requalified?? of course I am exaggerating.
I appreciate any suggestion
Regards
Miguel





RE: WPS Requalification API 1104
An increase in time between completion of root and start of hot pass should be self explanatory.
For travel speed, their interpretation was that the travel speed shown on the WPS should be no more than +/- 20 % from the median recorded PQR value. The specified range should reflect the minimum and maximum values that produce an acceptable weld.
For decrease in preheat, if you can measure a one degree difference.....
RE: WPS Requalification API 1104
RE: WPS Requalification API 1104
Ask for Guidelines for Interpretation and Application of API 1104.
Its pricy; $400.00 for non-members