Heat input Deviations

[RITHVIK Suresh]

Dear Experts,

I have a question regarding the allowable maximum deviation ( as per ASME SEC iX) for heat input, current, and voltage from the Procedure Qualification Record (PQR) when drafting the Welding Procedure Specification (WPS).

Best Regards

Rithvik.

[Parminder Singh]

Dear Rithvik, 

No deviation 

As QW-409.1 says An increase in heat input, or an increase in volume of weld metal deposited per unit length of weld, for each process recorded on the PQR.

As per QW-250 Tables, QW-409.1 is a supplementary essential variable. 

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[venkateswara reddy Desireddy]

Only impact test applicable PQR only need to record heat input.

other PQR no need.

heat input increases impact values decrease. So we have to maintain current, travel speed. 

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[shri krishna tripathi]

If the application include Austenitic stainless steel and intergrannular or other type of corrosion is concern of design then heat input becomes an essential variable, this is not due to sec IX , but fitness for purpose.

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Shri Krishna Tripathi

IGCAR,

Department of Atomic Energy