Heat input is not a thing that you can select, rather to be controlled by means of welding Voltage, current, travel speed, electrode diameter etc.
The ideal heat input for commonly used welding processes lies in between 0.8 kJ/mm to 2 kJ/mm. The heat input that you can be used during the production welding will be "as qualified with + or - some % variation mentioned in your PQR"
On the other hand, the interpass temperature, which should not be more than that the applicable code restricts.
Refer Table 8-1 of API RP 582 - 2001 : Welding Guidelines for the Chemical, Oil, and Gas Industries, for recommended interpass temperature of various materials.
ವಂದನೆಗಳೊಂದಿಗೆ / Best regards,
Nandesh Kumar A
Abu Dhabi, UAE
P.S. : Please don't print this e-mail unless you really need to.
From: Khandaker Imamul Hasan <kimamulhasan@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 12 November 2012 11:07 AM
Subject: [MW:15912] Selection of Heat Input During Welding
Dear Expert,
Good Morning
1. Could anybody tell me what should be the Heat Input (kJ/mm), during Welding, for the following material Carbon Steel (e.g. ASTM A-106 Gr-B), Low Alloy Steel (e.g. A335 P11, P22), Stainless Steel (e.g. A312 Tp 304L, 308L, 316L, 321)?2. How to select the appropriate Heat Input for a certain material.
--Best Regards
Khandaker Imamul Hasan
--
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