Heat Input formula

[Chandra, Vasanthan (Lagos)]

 

Friends,

 

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.

 

First Set:

 

1. Max Amp x Max V / Min Speed : Max Heat Input
2. Min Amp x Min V / Max Speed : Min Heat Input

 

Second Set:

 

1. Max Amp x Max V / Max Speed : Max Heat Input
2. Min Amp x Min V / Min Speed : Min Heat Input

 

Third set:

 

1. Min Amp x Max Volts /Min Speed : Maximum Heat Input
2. Max Amp x Min Volt / Max Speed : Minimum Heat Input

 

 

Regards,

Vasanth

 

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Any personal views or opinions expressed by the writer may not 
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[PB HEGDE]

Friends

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

i.e.

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

 

Regards

 

Hegde p.B.

[Shashank Vagal]

Just run a PQR, get mech tests done; if all comes Ok, try to stick to the lower end of the range as far as possible. Sec IX allows +15% deviation from the PQR values. Also, PB's guidelines can be followed. --- On Mon, 8/6/09, PB HEGDE <hegd...@isgec.com> wrote:

"This email is confidential.  If you are not the intended recipient, you must not disclose  or  use the  information contained in it..

If you have received this email in error,  please notify us immediately by return email and delete the email and any attachments. Any personal views or opinions expressed by the writer may not necessarily reflect the views or opinions of any company in the WorleyParsons Group of Companies."

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[Chandra, Vasanthan (Lagos)]

 

Hegde Saab,

 

I agree with you. However, as per Sec IX, the heat input can be calculated in either bead length or formula basis. If formula basis, then which one is applicable apart from bead length. Pl give me your input.

 

Regards,

Vasanth

 

 

 

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of PB HEGDE
Sent: 08 June 2009 08:28
To: material...@googlegroups.com
Subject: [MW:2347] RE: 2345] Heat Input formula

 

Friends

lang=EN-US>

[Huub de Goey]

Hi

The first statement is correct.
However, please keep in mind that you cannot guarantee that you're fullfilling logical requirements (range +/- 25% of PQR value)
Allways state on WPS's something like:
Corresponding with the welding in practice, the min Amp level+ the min Volt level are to be used with tje min speed level
the max Amp level+ the max Volt level are to be used with tje max speed level.

Regards,

Huub de Goey

2009/6/8 Chandra, Vasanthan (Lagos) <Vasantha...@deltaafrik.com>

[PB HEGDE]

Dear Vasanth

For following formula as per ASME code

Considering fluctuation in Current ,Volt and speed

 

You consider (while qualifying PQR)—i) Max Current and volt you get on Tong tester ii) Min welding speed /min

in 3 G position  This will give you Heat input by Formula  with practical consideration

Moreover The fluctuation depends upon Welders skill, machine type ,length of the cable etc.

ii) Heat input by  bead length, you consider the method  as explained earlier

This wi

[M Zulfan Syahrian]

All,

 

anyone can advice me why i can't recieve whoever was sending email to material-welding,while i have subscribe in this group

 

Rgds

zulfan

 

----- Original Message -----

From: handry gmail

To: z.sya...@gmail.com

Sent: Monday, June 08, 2009 2:01 PM

Subject: Fw: [MW:2345] Heat Input formula

[BR]

What does it mean? you have replied to a message which you recived, is
n't it?
Since you have joined only today, you can't recive the past
discussions, for referring them you might check at http://materials-welding.blogspot.com/
or http://groups.google.com/group/materials-welding?hl=en

On Jun 8, 1:26 pm, "M Zulfan Syahrian" <z.syahr...@gmail.com> wrote:
> All,
>
> anyone can advice me why i can't recieve whoever was sending email to material-welding,while i have subscribe in this group
>
> Rgds
> zulfan
>
>
>
>   ----- Original Message -----
>   From: handry gmail
>   To: z.syahr...@gmail.com
>   Sent: Monday, June 08, 2009 2:01 PM
>   Subject: Fw: [MW:2345] Heat Input formula
>
>   ----- Original Message -----
>   From: Chandra, Vasanthan (Lagos)
>   To: material...@googlegroups.com
>   Sent: Monday, June 08, 2009 1:55 PM
>   Subject: [MW:2345] Heat Input formula
>
>   Friends,
>
>   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.
>
>   First Set:
>

>     1.. Max Amp x Max V / Min Speed : Max Heat Input
>     2.. Min Amp x Min V / Max Speed : Min Heat Input
>
>   Second Set:
>
>     1.. Max Amp x Max V / Max Speed : Max Heat Input
>     2.. Min Amp x Min V / Min Speed : Min Heat Input
>
>   Third set:
>
>     1.. Min Amp x Max Volts /Min Speed : Maximum Heat Input
>     2.. Max Amp x Min Volt / Max Speed : Minimum Heat Input

>
>   Regards,
>
>   Vasanth
>
> *** WORLEYPARSONS GROUP NOTICE ***
> "This email is confidential.  If you are not the intended recipient, you must not disclose  or  use the  information contained in it.
> If you have received this email in error,  please notify us immediately by return email and delete the email and any attachments.
> Any personal views or opinions expressed by the writer may not

> necessarily reflect the views or opinions of any company in the WorleyParsons Group of Companies."- Hide quoted text -
>
> - Show quoted text -

[PB HEGDE]

Hi!

As per QW 409.1 There is no tolerance for increase in heat input  but you can reduce heat input.. Increase in heat input calls for requalification of PQR

 

Regards

 

Hegde

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Huub de Goey

Sent: Monday, June 08, 2009 2:19 PM
To: material...@googlegroups.com

[Muhammed Ibrahim]

 

Dear Mr. Hegde,

 

Increase in heat input is supplementary essential variable. For non impact job we can give tolerance. Am I correct?.

 

Regards,

Muhammed Ibrahim

2009/6/8 PB HEGDE <hegd...@isgec.com>

Hi!

As per QW 409.1 There is no tolerance for increase in heat input  but you can reduce heat input.. Increase in heat input calls for requalification of PQR

 

Regards

 

Hegde

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Huub de Goey
Sent: Monday, June 08, 2009 2:19 PM
To: material...@googlegroups.com
Subject: [MW:2351] Re: Heat Input formula

 

Hi

--
Thanks & Regards
Muhammed Ibrahim PK

[PB HEGDE]

Yes in that case there is no restriction on Heat input and therefore you can give any tolerance

 

Hegde

[suneel gore]

Pl find attched the heat in put clculation table for general application Regards   SUNEEL GORE

--- On Tue, 9/6/09, PB HEGDE <hegd...@isgec.com> wrote:

Hegde

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