Tolerances for I and U for WPS
Tolerances for I and U for WPS
(OP)
Hello,
Iwould like to know what are tolerances for U and I you write on your WPS, according the PQR?
Thank you for your help.
Regards.
Iwould like to know what are tolerances for U and I you write on your WPS, according the PQR?
Thank you for your help.
Regards.





RE: Tolerances for I and U for WPS
Tolerance should be controlled through an equipment maintenance and calibration program. The developer of the PQR should know how far the actual values can deviate from the "Knob".
RE: Tolerances for I and U for WPS
RE: Tolerances for I and U for WPS
RE: Tolerances for I and U for WPS
Thank you for your answers. But my question is about WPS required for welding in shoop floor.
In your PQR you define all electrical parameters, and you fix these parameters, for a grade, a thickness, a diameter, number of layers....and you are qualified for these variables.But in shop floor, in the WPS you have to define the type of joint, parameters ....according the PQR, and my question is about tolerances you write for electrical parameters,U and I ? +- 20% ?
Sometimes, some inspectors require for welding the max and mini!
best regards.
RE: Tolerances for I and U for WPS
RE: Tolerances for I and U for WPS
RE: Tolerances for I and U for WPS
AWS Log: INQ-21
Inquiry: (1) For a prequalified WPS, is it the intent of AWS D1.1:2000 that a single value or mean value
be specified and the limitations of Table 4.5 be applied to the specified value?
(2) For a prequalified WPS, is it the intent of the AWS D1.1:2000 that a range of values may be
specified and the limitations of Table 4.5 be applied to the specified range?
Response: (1) No. Use of a single value or mean value is neither required nor prohibited.
(2) Yes, as long as the range of values is within the range of the manufacturer's
recommendations, see 5.3.1.2.
RE: Tolerances for I and U for WPS
The amperage is to be addressed howver there is nothing that references range or how its controlled. I have been in a few shops where the manufaturer has written into their quality system "Procedures for Calibrating Welding Machines" . Welding machines are not meausuring instruments. The gauges MAY be. The Clamp on Ammeter MAY be. However there is nothing in most of the codes that requires this check to be done. A companies quality system should address this in the "Control Of Special Processes" section in thier manual.
Interpretation: IX-95-18
Subject: Section IX, QW-409.8, Electrical
Characteristics
Date Issued: October 19, 1995
File: BC95-220
Question: Does Section IX require that a
separate amperage range be specified for each
filler metal size listed in the WPS?
Reply: No.
There is a page on my website at htt
Have a nice day.
Gerald Austin
Iuka, Mississippi
http://www.weldinginspectionsvcs.com