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
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
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.
- Max Amp x Max V / Min Speed : Max Heat Input
- Min Amp x Min V / Max Speed : Min Heat Input
- Max Amp x Max V / Max Speed : Max Heat Input
- Min Amp x Min V / Min Speed : Min Heat Input
- Min Amp x Max Volts /Min Speed : Maximum Heat Input
- Max Amp x Min Volt / Max Speed : Minimum Heat Input
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