Dear Vasanth
For following formula as per ASME code
Considering fluctuation in Current ,Volt and speed
You consider (while qualifying PQR)—i) Max Current and volt you get on Tong tester ii) Min welding speed /min
in 3 G position This will give you Heat input by Formula with practical consideration
Moreover The fluctuation depends upon Welders skill, machine type ,length of the cable etc.
ii) Heat input by bead length, you consider the method as explained earlier
This wi
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 1:08 PM
To: materials-welding@googlegroups.com
Subject: [MW:2350] RE: 2347] RE: 2345] Heat Input formula
Hegde Saab,
I agree with you. However, as per Sec IX, the heat input can be calculated in either bead length or formula basis. If formula basis, then which one is applicable apart from bead length. Pl give me your input.
Regards,
Vasanth
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PB HEGDE
Sent: 08 June 2009 08:28
To: materials-welding@googlegroups.com
Subject: [MW:2347] RE: 2345] Heat Input formula
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
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