| Dear John,
We have already tried two layers, but then the hardness is only 45RC, there is no problem in the hard facing electrode as we have tested it in a separate pad it is giving 60 RC. One of our group professional has suggested the following process, I layer 7018 next 309 one layer, then we have to grind the half bead of 309 deposit, then again one more layer 309, grind the half bead,finally the hard facing layer, intension is to reduce the dilution.
Please given your comments on this
Srinivas --- On Mon, 9/8/10, John Du Plessis <duplessisj@saiw.co.za> wrote:
From: John Du Plessis <duplessisj@saiw.co.za>
Subject: [MW:6403] RE: 6343] HARDNESS ON SS WELDING
To: materials-welding@googlegroups.com
Date: Monday, 9 August, 2010, 9:38 PM
The loss or reduction in hardness is purely because of dilution. The only way to overcome the issue is to minimize the dilution. Reduce the heat input to ass low as possible on the first layer of the hardfacing. Normally a single pass will never achieve the hardness required and ths yu will have to weld at least two passes. It is fairly easy to assume the amount of dilution and calculate how many weld passes must be deposited to achieve the minimum hardness John du Plessis Technology Manager Tel: +27 (11) 298 2100 Tel: +27 (11) 298 2103 (Direct) Fax: +27 (11) 836 6014 Mobile:+27 (0) 82 883 4970 www.saiw.co.za This email and any files transmitted with it are confidential and may be legally privileged. They are intended solely for the use of the individual or entity to whom they are addressed. Access to this e-mail by anyone else is unauthorised, and any disclosure, copying, distribution or other use of this e-mail is prohibited and may be unlawful. We will not under any circumstances have any responsibility or liability arising out of or in connection with any unauthorised use of this e-mail. If you have received this email in error please notify the sender before deleting it.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of gaddam Srinivas
Sent: 07 August 2010 04:23 AM
To: materials welding
Subject: [MW:6343] HARDNESS ON SS WELDING One layer MS electrode 7018 and 2 layers of SS-309 grade electrode is being used to fill the gaps, and finally hardfacing electrode of 60 RC (appplication) fabricators of ID fans. They are using the above combination to join MS plate to hardfaced wearplate, now the problem is, the hardness of the hardfacing electrode when directly tested, it is coming 60 RC and when it is used as a final layer on SS 309 grade electrode it is coming 35 RC. They require the hardness of 60 RC but they cannot change the process of using 7018 and 309 as it is mentioned in the drawing. Now how can they get the 60 RC, whether they have to change the welding sequence or any other solution plealse let me know. | --
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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. -- 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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