PWHT has to be done inmediatelly after welding?... Is it suitable to do it after 48 hours or not?
Thanks and regards
Alexis
Date: Mon, 4 Oct 2010 20:50:45 -0700
From: karthik6684@yahoo.com
Subject: Re: [MW:7367] Tack welding of Low alloy steels.
To: materials-welding@googlegroups.com
| Hi, Please find suggestions as below. Query:1. I needs to follow the same thing for tacking?. Yes.If you are going to use this Tack weld incorporate with final weld.If u plan to grindout the tack weld..then no need. 2. If GT AW process i use ( No flux/coating involved, No question of diffussible hydrogen level to be dried off after welding) for tacking, can i eliminate postheating? Actually,Post heating is required by some customer to avoid cold crack if the PWHT is not followed immedietly after the weld.In your case,if you are use this tack weld as a permanent final weld and after tack weld if the final weld done after a long time,then you have to do post heat as per your customer spec. 3. Is there any other mothods of simplifying/avoiding postheating. As the post heat required by your customer,yo have to follow..There is only option is you have to do PWHT immedietly after the weld finish Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Tue, 10/5/10, P.Rao <vasantharao2009@rediffmail.com> wrote:
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