Re: [MW:20480] Regarding WPS Heat Input.

I am assuming that the travel speed is 3.36 inch/min which is
equivalent to 85.344 mm/min

Formula is VA X 60 / TS X 1000
85(27) X 60 / 85.344 X 1000 = 1.6 KJ

I am not sure where you got the 0.68 from.



On Thu, Apr 3, 2014 at 6:58 AM, Prashun Kumar <prashunk@gmail.com> wrote:
> Dear All,
>
> As In site,
>
>
>
> Welding Inspector taking daily welding parameters per pass each day for
> WPS-01, currently for root, the welder is not able to meet the requirements
> of Min heat Input mentioned in the WPS.
>
> For example :As per WPS
>
> For root:
>
> Amperage:84-102
>
> Voltage:25.5-31.2
>
> Travel Speed:3.35-4.10.
>
> Heat Input(Min):0.710
>
>
>
> Welder welding in current: 85, Voltage:27, Travel speed:3.36, Heat
> Input:0.68 which is not meeting the min Heat Input range.(whether this
> should be accepted or rejected).Please clarify.
>
>
>
> Reply given by -Welding Engineer in blue: I suggest to increase the
> current to slighter higher value without changing the voltage & travel
> speed.
>
>
>
> Mr.Mani, we need to try best combination of parameters by varying
> current, voltage & travel speed within the parameters provided in WPS
> which are most suitable for all the welders in production welds.
>
>
>
> Once you fix the particular Amps, Volts, travel speed, you need to
> check these parameter in actual production whether welders are
>
> following the same. In above example, i feel just by increasing the
> current slightly will solve your problem.
>
>
>
> Minimum variable range for amperage and voltage mentioned in the WPS is not
> meeting to achieve Min heat Input mentioned. If it is not achieving the Min
> heat input ,then why ranges for voltage and amperage mentioned to follow
> the procedure.
>
> This was asked to QA/QC Inspectors, they were unable to clarify.
>
>
>
> WPS parameters are +/- 10% of PQR average values.
>
>
>
> For getting min heat input, we should not multiply min current X min
> voltage/ Min Travel speed.
>
>
>
> If we use above formula in writing WPS ranges, WPS parameters will not be
> actual paramters used in PQR qualification.
>
>
>
>
> Can anybody can clarify this for me: I m not satified with this answer :Can
> anbody explain me how the parameters are taken from PQR to make WPS.
>
> Regards,
>
> Prashun
>
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