Hello, Dear Expert,
I would appreciate your insights on the following question concerning heat input calculations for impact-tested WPS. The Qualification Code is ASME Sec. IX. Yes, there is an impact test. The contractor has submitted the WPS heat input, which is shown in the screenshot below. (The second last and last columns were added by me.
I would appreciate your insights on the following question concerning heat input calculations for impact-tested WPS. The Qualification Code is ASME Sec. IX. Yes, there is an impact test. The contractor has submitted the WPS heat input, which is shown in the screenshot below. (The second last and last columns were added by me.
Question: How do you calculate heat input?
1. Third Last Column: The contractor recorded the highest heat input from PQR on the WPS as it is.
2. Second Last Column: Heat input is computed by averaging the amperage, voltage, and travel speed.
3. Last Column: The calculation of heat input relies on the maximum amperage, voltage, and travel speed.
Which method is the correct one for calculating heat input?
1. Third Last Column: The contractor recorded the highest heat input from PQR on the WPS as it is.
2. Second Last Column: Heat input is computed by averaging the amperage, voltage, and travel speed.
3. Last Column: The calculation of heat input relies on the maximum amperage, voltage, and travel speed.
Which method is the correct one for calculating heat input?
Heat Input will be higher than from PQR with available variables.
Reference :
Table QW-253 Welding Variables Procedure Specifications (WPS) — Shielded Metal-Arc Welding (SMAW)
QW-409.1 Increase in heat input shall be consdire essential variable.
QW-409.1 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. For arc welding, the increase shall be determined by (a), (b), or (c) for non-waveform controlled welding, or by (b) or (c) for waveform controlled welding. See Nonmandatory Appendix H. For low-power density laser beam welding (LLBW), the
increase shall be determined by (d).
(a) Heat Input
increase shall be determined by (d).
(a) Heat Input
heat input J/in. (J/mm) = [(voltage × amperage × 60) / travel speed ] in./min (mm/min)
(b) Volume. Volume of weld metal measured by
(1) an increase in bead size (width × thickness), or
(2) a decrease in the length of the weld bead per unit length of electrode
(c) Heat Input Determined Using Instantaneous Energy or Power
(1) an increase in bead size (width × thickness), or
(2) a decrease in the length of the weld bead per unit length of electrode
(c) Heat Input Determined Using Instantaneous Energy or Power
Best Regards,
Muhammad Babur Khan Lashari
Project Quality Supervisor.
API 570, API 510, CSWIP 3.2.2. ISO 9001:2015.
Inspection Department
Mob: +966 58 2774568 / +966 51 0559680
+92 334 6186285
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