Just run a PQR, get mech tests done; if all comes Ok, try to stick to the lower end of the range as far as possible. Sec IX allows +15% deviation from the PQR values. Also, PB's guidelines can be followed.
--- On Mon, 8/6/09, PB HEGDE <hegde.pb@isgec.com> wrote:
From: PB HEGDE <hegde.pb@isgec.com>
Subject: [MW:2347] RE: 2345] Heat Input formula
To: materials-welding@googlegroups.com
Date: Monday, 8 June, 2009, 12:58 PM
Friends i)For SMAW process , The Formula given is a thumb rule but ii)We generally major on bead length basis ,As we have observed in SMAW ,it is difficult to control the consistent Current and Voltage i.e. Say For 4Dia x 450 length of electrode We measure the weld bead length after burning say 400mm length of electrode and the same is recorded in PQR/ e.g. 350mm bead length for burning of 400mm electrodes . This way we control the heat input of weld to get good impact property We can mention the bead length against individual size electrodes in WPS Regards Hegde p.B. From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Chandra, Vasanthan (Lagos)
Sent: Monday, June 08, 2009 12:26 PM
To: materials-welding@googlegroups.com
Subject: [MW:2345] Heat Input formula Friends, I have got the following formulae for calculating the heat input for SMAW and other welding processes'. Pl confirm which one is correct. As far as I am concerned, I am following the FIRST SET for all the process. First Set: - Max Amp x Max V / Min Speed : Max Heat Input
- Min Amp x Min V / Max Speed : Min Heat Input
Second Set: - Max Amp x Max V / Max Speed : Max Heat Input
- Min Amp x Min V / Min Speed : Min Heat Input
Third set: - Min Amp x Max Volts /Min Speed : Maximum Heat Input
- Max Amp x Min Volt / Max Speed : Minimum Heat Input
Regards,
Vasanth *** WORLEYPARSONS GROUP NOTICE *** "This email is confidential. If you are not the intended recipient, you must not disclose or use the information contained in it.. If you have received this email in error, please notify us immediately by return email and delete the email and any attachments. Any personal views or opinions expressed by the writer may not necessarily reflect the views or opinions of any company in the WorleyParsons Group of Companies."
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