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Active Contributor

Join Date: Apr 2007
Posts: 23

# Calculations for Welding Pipe

05/02/2007 7:48 AM

Dear All,

I am mechnical Engineer,we are doing pipe line project, Dia of the pipe is 72" which used for our project but Maximum dia we are getting only upto 48",so we tried to bring plates and roll it using roller machine and it also get sucess

Plate used for rolling is 2M x 12M x 10MM thick Material:S275 JR,Please Advice how much electrode used

Note: 1) we required to weld in Lth Section and as well as in dia Section

2) Welding using for this project is Make:-Essab,E-7018,dia 2.4mm,3.2mm lth

3) Total Length of the pipe line 200M2

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Active Contributor

Join Date: Oct 2006
Location: West Brabant - Netherlands
Posts: 21
#1

### Re: Calculations for Welding Pipe

05/03/2007 12:26 AM

Assume the rolled 72"sections are 2 mtr in length

Welding volume calculation Weld V60 º

Plate thickness 10 mm

Root opening 3 mm

Nose 3 mm

Welding volume for V welds 60 ° for each mtr

Rootopening x Plate thickness + ( Plate th. – nose length) ^2 / (SQRT(3) = mm2 cross section

mm2 crossection x 1000 mm length / 10^3 = netto weldvolume cm3

3 x 10 + 49/1,732 = 28,29 mm x 1000 mm / 10^3 = 58,29 cm3

100 pcs of longitudinal weld of 2 mtr 11.658 cm3

99 pcs of circumferential welds 72" 33.083 cm3

--------------

Total nett welding volume 44.741 cm3

Add 10% for spherical closing 4.474 cm3

Add 5% for grind back and counterweld the root 2.237 cm3

---------------

51.452 cm3

= approx 400 kg netto welding metal

Member

Join Date: Apr 2009
Posts: 6
#3

### Re: Calculations for Welding Pipe

04/30/2009 1:39 AM

Hi Peter,

Thanks a lot for your reply with worked out example.I have been searching for this stuff for the last 6 months.I have raised this query in many forums and groups and unfortunately none of them responded properly.Many people gave answers in a vauge manner as they are the new generation Einsteen!!!!Like every engineer, I also know the common mathematical principle what we have to apply over here.But a worked out example is a different one with unit conversion and it really giving practical exposure.You have done a great job for fresh or less experienced welding engineers.

Again thank you

Regrds,

Inconel

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Participant

Join Date: May 2007
Posts: 2
#2

### Re: Calculations for Welding Pipe

05/03/2007 12:29 AM

Consider the weld joint design is "V" {Buttweld with 1.6mm gap}. Consider this to be a "Triangle". You need to calculate the area of this Triangle. i.e. the plate you have considered is 10mm thk. Hence, the triangle dimensions - height =10mm, Bevel angle = 30 or 45 deg.. Now calculate the base. Now you have the dimensions of the triangle. Calculate the area of the triangle. Multiply this with total length. This area is what you should be filling with an electrode. {A}

The electrode is of 250 or 350 or 450 mm in length depending upon the electrode dia. Consider 75% of metal deposit efficiency {exclude the wastages}. This would give you weld metal deposit with one electrode. {B}

Now do the simple arithmetic - how much electrodes are required for the total worked out for a given weld design

trust this clarifies.

Member

Join Date: Apr 2009
Posts: 6
#4

### Re: Calculations for Welding Pipe

04/30/2009 1:49 AM

Hi Sre eram,

If possible provide a worked out example instead of explaing common maths.Please avoid explaining common mathematical principle as we are well aware of those things.We are looking for real practical explanation with examples.

__________________
It is far better to be associated with a few who are right than with the mob which is wrong,because right is always the winner in the end.
Anonymous Poster
#5

### Reg: Calculations for Welding Pipe

01/05/2010 7:49 AM

Hi ,

This is raghu I am working weldind calculation. can you please help me how to do welding calculations for rectanguler tube which are perpendicular to each other. welding type is v-type weld.

Thanks and regards,

raghu

raghugct114@gmail.com

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