HOW TO DECIDE NUMBER OF WELDING PASSES REQUIRED TO BE WELDED BASED ON THICKNESS OF BASE PLATE? OR FOR DIFFERENT PLATE THICKNESS

[API 650 TANK CONSTRUCTION]

Can any one guide me pleaseeeeeee

Based on the base metal thickness or thickness of shell plate how to decide the approximate number of welding passes to be required???..........

For Example:  IF the thickness of the plate is as given Below 

1.  8 mm thickness shell plate how many welding passes required?
2. 12 mm thickness plate how many welding passes required?
3. 25mm thickness plate how many welding passes required????
4. 29mm thickness plate how many welding passes required?
5. 33mm thick plate
6. 36mm thick plate
7. 39mm thick plate 
8. 41mm thick plate 
9. 45mm thick plate 

like this just by knowing the thickness of the plate i must decide and calculate the number of welding passes to be required for this plate thickness 

is there any theoretical formula and or excell sheet or methods to calculate the number of welding passes for different plate thicknesses ???????????

just guide me any CALCULATION FORMULA????

just guide me any EXCEL SHEET ?????????

ANY ATTACHMENT MATERIALS??????

PLEASE GUIDE ME...............................IF ANYTHING LIKE THAT  

[Souravbohray]

welding throat for two diff thickness is .7 x min thickness of plate.
for same thickness throat should be more than thickness of plates.

[Gurunath Guruputranavar]

Mr.sourav can you share more hints and ideas regarding above topic 

Can you please give more detailed explanations?????????????

Send if any attachment files in word or Excel file Or Pdf file????????????????

On Fri, Dec 8, 2017 at 9:00 AM, Souravbohray <ermechsou...@gmail.com> wrote:

welding throat for two diff thickness is .7 x min thickness of plate.
for same thickness throat should be more than thickness of plates.

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[Er Sourav Bohray]

sr its universal law .. but if size is given in drawing than we have to do weld according to that.
if not than use my hint.
passes does not main thing is throat and leg size.
to decide the electrode diameter root gap and root face is to be maintained.
thickness also..

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[Gurunath Guruputranavar]

kindly send if any excel sheet attachment for reference 

to identify and calculate the number of welding passes to be required for different plate thickness 

[Er Sourav Bohray]

type of welding u want to do ..... according to that size of electrode..
and there is no excel file for this sr its common we have to do full thickness welding with type of reinforcment mention in drawing.. dnt make it complicate ... only width can be achived lyk 3 - 4mm x dia of electrode..
ampere can be 30 -40 x dia of electrode.
or its also depend welding can be achived in single pass or multiple pass.