Re: [MW:4130] Demagnetization after completion of MPI test

Dear Mr. Raghavendra   1.  Carrying out the MT using AC yoke will not necessaite demagnatization. 2.  When DC is used, you may reverse the current flow and progressively decrease the magnetic current. If you have done the MT using 900 amps. you must do the same with initial current of 900+ and decreasing. 3.  Carry out the MT on completion of all welding just prior to PWHT.  If MT is required after PWHT carry out the same using AC yoke.   Regards   Gopu Nair --- On Thu, 21/1/10, PEMMARAJU RAGHAVENDRA <rpe@hzw.ltindia.com> wrote: From: PEMMARAJU RAGHAVENDRA <rpe@hzw.ltindia.com> Subject: [MW:4123] Demagnetization after completion of MPI test To: materials-welding@googlegroups.com Date: Thursday, 21 January, 2010, 5:54 PM Dear All, Can any one tell us the various methods / procedure  of demagnetizing the weld after completion of Magnetic particle testing on Ferritic steel welds. Regards, Raghavendra  Larsen & Toubro Limited www.larsentoubro.com This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.