Re: [MW:9538] heat input calculation in welding

Dear Sandeep,

As stated by you that "every pass has its effect on base metal", Your PQR shall include heat input for each pass and WPS to be written with Heat Input for each pass, as per QW-409.1, any increase in heat input for each pass will require requalification.

Heat input shall be calculated with QW-409.1 (a) and (b), if with any of these methods Heat Input is increased, you need to requalify the WPS, that's why max. heat input value is written for WPS.


Regards
Manpreet Singh




On Fri, 28 Jan 2011 10:55:51 +0530 sandy wrote
>Hi everybody
>
>I have one query regarding the heat input.
>If I am welding a joint with multipass, then I have diffrent heat
>input for every pass depening on the parameters. now I want to know
>which heat input shall be taken into consideration for the effect of
>heat input on base metal, cauz every pass has its effect on base metal
>and after every pass due to the previous heat input I am giving extra
>heat in the base metal.
>So I want to know should I take individual heat input or sum of all
>heat input for getting the exact effect of Heat input on base metal.
>
>Regards
>Sandeep Kumar
>
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.