[MW:13606] RE: 13596] WPS with baking for welding single side welded Joint without backing with qualified Welder without backing

Backing is a non-essential variable, QW-402.5, for most common welding processes. 

ASME Section IX addresses non-essential variables in QW-200.1(c) thusly; 

“Changes may be made in the nonessential variables of a WPS to suit production requirements without requalification provided such changes are documented with respect to the essential, nonessential, and, when required, supplementary essential variables for each process.  This may be by amendment to the WPS or by use of a new WPS.”

So:

(1)  Your weld must be within the qualified ranges for all the essential variables and, if impact testing is required, supplementary essential variables.

(2)  Your WPS must be revised/or new WPS written to allow the “new” non-essential variable

(3)  Your weldor must be properly qualified per Article III (if required)

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Aly
Sent: Tuesday, January 31, 2012 11:07 AM
To: materials-welding@googlegroups.com
Subject: [MW:13596] WPS with baking for welding single side welded Joint without backing with qualified Welder without backing

 

Dear experts,   Could you please clarify following;   If I have qualified WPS with backing & qualified Welder without backing; with this can we weld single side welded joint without backing.Please reply me in the light of ASME SEC IX.   Thanks in advance   Ali Mhaskar

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