[MW:857] Diffusible H2 content and Hydrogen cracking study

Dear Mr Mathusoothanan

Apriciate your posting, but I have to approve this message without the
attchements, since it is agianst the rules of this group (and all
members are requested to not post any codes/standards as attachements
in the group)

Thanking you for your co operation!

-----Original Message-----
From: mathu.subramanian [mailto:mathu.subramanian@kharafinational.com]
Sent: Thursday, June 12, 2008 10:20 AM
To: materials-welding@googlegroups.com
Subject: 851] Diffusible H2 content and Hydrogen cracking study

Dear friend,

E6013 is not the compatible electrode to weld Cr-Mo steels and it is
normal
carbon steel electrode. In Cr-Mo steels so many grades are there. Gr.1,
Gr.11, Gr.22, Gr.5, Gr.9, Gr.91. Please refer attached ASME Specs for
Electrodes & Materials. According to grade of material welding
electrodes is
to be selected.

As said by Mr Raghuram, two different AWS classifications can not be
compared for
diffusible hydrogen level. Two hydrogen levels of same AWS
classification
should be selcted.

I think the material grade you have selected might be Grade 9.

Regards.

S.Mathusoothanan

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
Raghuram
(Mumbai - PIPING)
Sent: 12 June, 2008 6:31 AM
To: materials-welding@googlegroups.com
Subject: [MW:851] Diffusible H2 content and Hydrogen cracking study

What type of Cr-Mo steel it is?
What is the basis of selecting E6013 for Cr-Mo steel?
Why diffusion hydrogen level required for E6013, when it is not a low
hydrogen electrode?
One can't compare the stress value with two different AWS
classifications; instead you can study by taking two different batches
of E9015B9 electrodes with different diff H2 levels (not comparing with
E6013) and test it!

Members please share your thoughts

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of mech
Sent: Wednesday, June 11, 2008 7:49 PM
To: Materials & Welding
Subject: [MW:846] on preheating effect

dear sir
i am a welding engg student and doing project on hydrogen cracking
of cr-mo steel by using implant test method.
the following result were observed

electrode diff hydrogen
level critical stress

E6013 (ruttile type) 5
ml 456 mpa
E9015 B9
10.6ml 500 mpa
according to theory if hydrogen level increases critical cracking
stress will decreases but in my exp critical cracking stress is coming
more in low level of hydrogen

i would like to have your comment on this result

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