Re: [MW:23055] Re: 23051] Magnetization of A 335 P11/P12 during grinding process [GroupMail]

Usually during welding, you use earthing connection. Try to add 2 more earthing connections and weld, sure it will demagnetised during welding.

Usually we follow the same for welding of 9%Ni steeel

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On 08-Apr-2015, at 11:13 am, B Osare <bosare@nfl.co.in> wrote:

We have preheated up 250 deg C but no result...please suggest the Preheat Temp.

 

From: Manoj Singh

Sent: Tuesday, April 07, 2015 7:25 PM

To: materials-welding@googlegroups.com

Subject: Re: [MW:23051] Magnetization of A 335 P11/P12 during grinding process [GroupMail]

 

Do preheat before welding do demagnetize it

 

On Tue, Apr 7, 2015 at 2:54 PM, Don Under Survilliance <donsaab3@gmail.com> wrote:

wrap the copper coils around the job at location and ground it. it will surely help

 

 

On Tue, Apr 7, 2015 at 12:36 PM, B Osare <bosare@nfl.co.in> wrote:

Dear Experts,

 

We have observed that piping material  A 335  P11 & P12 of Super heater Header Tee size 12"& 18" (Thickness 45.00 mm & 65.00 mm respectively)  was magnetized during grinding process at Location (not in workshop).   Can anyone tell us how this phenomenon occurs and how it can be de-magnetize at job location? The weld material is getting cracked after welding. Please suggest the  welding procedure with suitable welding electrodes & what precautions  to be taken during welding.

 

 

Regards

 

B Osare

From National Fertilizers Limited, Vijaipur

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