heat input calculation

[Martin Prad]

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.

[Vinod Kataria]

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

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[Martin Prad]

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

[muthusrinivasan muthuselvam]

conversion factor to convert the travel time to mm/sec

[kgk murti]

dear Martin,
USE  VI/S TO GET JOULES/MM(VOLTAGE*CURRENT/WELDING SPEED)
71*9.5/3.2*25/60
regards
Dr.K G K MURTI

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[Fitria Rahman]

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>

[Pieper QSI]

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

[Kathalingam Babu]

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

[Joshi Gaurang]

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 

[george....@gr.bureauveritas.com]

Basic Physics
you can not convert Energy into Temperature.
Just like you cannot convert dogs to potatos

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
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[Jim Price]

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

jimp...@polarcorp.com

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[Alan Denney]

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

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[george....@gr.bureauveritas.com]

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
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04

"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

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