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RE: [MW:23771] RE: 10970] heat input calculation

By Materials & Welding

Celcius Heat Unit is an other unit for energy and not for temperature.

It is quire complicate to calculate an approximation of the temperature profile developed during welding.
Many variables are involved like the heat sink which depends of the weld dimensions and configuration and of the conductivity of the metal which varies with the temperature, the heat transfer by radiation (not to forget that  the emissivity of the metal surface varies with the temperature) etc
F.E modeling should be used but with caution

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
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"Alan Denney" ---21/10/2015 06:49:49---Interesting but what is the underlying calculation? Don't trust black box solutions. The heat flow t

From: "Alan Denney" <alan@denney1.freeserve.co.uk>
To: <materials-welding@googlegroups.com>
Date: 21/10/2015 06:49
Subject: RE: [MW:23764] RE: 10970] heat input calculation
Sent by: materials-welding@googlegroups.com




Interesting but what is the underlying calculation? Don't trust black box solutions. The heat flow theory is complex and this cannot be a proper model.
 
Alan Denney
AKD Materials Consulting Ltd
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Jim Price
Sent: 20 October 2015 13:42
To: materials-welding@googlegroups.com
Subject: RE: [MW:23760] RE: 10970] heat input calculation
 
Below is a link to a calculator that will calculate Kj to C.
Hope this helps
http://www.convertunits.com/from/kilojoules/to/celsius+heat+unit
 
Best Regards
 
Jim Price | Welding Engineer, CWI
Direct:  320.7463439 | Fax: 417-862-5564
jimprice@polarcorp.com 

 
 
 
 
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Joshi Gaurang
Sent: Tuesday, October 20, 2015 4:03 AM
To: Materials & Welding
Cc: kathalingam.qaqc@ppl.com.sg
Subject: Re: [MW:23759] RE: 10970] heat input calculation
 
Hi,
 
What i should consider, that heat input is v*I*n*60/TS, TS is travel speed so it will give me Kj/mm but how i can convert it to temperature ....
Additionally now i can convert it into temperature than it will give me input heat but what about actual heat inut which may very metal by metal so how i can calculate that .
 
Thank you

On Sunday, 8 May 2011 17:24:04 UTC-7, Kathalingam Babu wrote:
Hi
 
The arc efficiency as mentioned below is used for the actual heat input calculation.
 
The stds/Codes works on the theoretical HI , which is more than the actual HI, so no need to worry about the arc efficiency factor.
 
Infact the those values are only the approximate values , if you want actual arc efficiency values you have to go for an calorimeter set up to find out the actual one
 
Thanks & Regards,
 
K. Babu
    ----- Original Message -----
    From: Pieper QSI 
    To: material...@googlegroups.com 
    Sent: Friday, May 06, 2011 6:07 PM
    Subject: RE: [MW:10980] RE: 10970] heat input calculation
     
    Correct me when I'm wrong but this efficiency factor is not mentioned in any original calculation formula and specifications such as ASME section IX and/or EN ISO 15609/15614 therefore in my opinion cannot taken into account for official calculation of Heat Input.
     
    Met vriendelijke groeten / Best Regards
     
    Herman Pieper
     
    Pieper Quality Support & Inspection
    Phone: +31 (0)521 380083
    Fax:     +31 (0)84 7539225
    Cell:     +31 (0)6 51691215
    www.pieper-qsi.nl
     
    Van: material...@googlegroups.com [mailto:material...@googlegroups.com] Namens Fitria Rahman
    Verzonden:     vrijdag 6 mei 2011 10:48
    Aan:     material...@googlegroups.com
    Onderwerp:     Re: [MW:10979] RE: 10970] heat input calculation
     
    Dear All

    i notice that there is an important piece of formula is missing. the heat input formula given by Firman shall be multiplied by     efficiency which is depending on its welding process. GMAW & SAW having efficiency 0.9, GTAW=0.8, SMAW=0,75

    rgds
    2011/5/6 muthusrinivasan muthuselvam <msm...@gmail.com>
    conversion factor to convert the travel time to mm/sec
     
    On Fri, May 6, 2011 at 1:46 PM, Martin Prad <marti...@hotmail.com> wrote:
    what is 60 (V*I*60) in this formula?
    From: vinod....@blissanand.com
    To:     material...@googlegroups.com
    Subject: [MW:10974] RE: 10970] heat input calculation
    Date: Fri, 6 May 2011 13:00:05 +0530

    You can calculate by using following formula:-

     

    Heat Input = (V*I*60)/(Travel Speed in mm) this will come in J for KJ please further devide it with 1000.

     

    For the below value the Heat Input shall be

    0.50 KJ.

     

    With kind regards,

    Vinod Kumar Kataria

    GM - Operations

    Bliss Anand Private Limited,

    92B/93B Sector 5

    IMT Manesar,Gurgaon,

    National Capital Region Delhi.

    India .

    Phone : +91-124-4366000 (9 Lines)

    Mobile Phone : +91-9560199004

    Fax : +91-124-2290884

     

    From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Martin Prad
    Sent:     Friday, May 06, 2011 11:00 AM
    To:     material...@googlegroups.com
    Subject:     [MW:10970] heat input calculation

     

    gents,

    how to calculate the heat input in KJ/mm if i have got the folowing parameters?

    Amperage=71
    Voltage=9.5
    Travel speed=3.2 inch/minute
    can you please put these in the formula?

    thanks.

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