Clarification in Rate of heating and cooling.
Gopalakrishnan G
Parminder Singh
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Parminder Singh
Amol Betkar
Dear,
In welding procedure specifications (WPS) and procedure qualification records (PQR), the rate of heating and cooling is an important parameter that can influence the mechanical properties of the welded joint, including ultimate tensile strength (UTS) and impact properties.
The ASME Boiler and Pressure Vessel Code, Section IX, UCS-56 specifies the maximum rates of heating and cooling for various materials and thicknesses to ensure the mechanical properties of the welded joint meet the required standards. For ASME Code applications, it's crucial to adhere to these specifications to ensure the integrity and safety of the welded component.
In your case, the specified rate of heating and cooling is 100°C/hr, which is lower than the maximum allowable rate specified in UCS-56 for the given material thickness. This lower rate may result in a more controlled heat input during welding and subsequent cooling, which could potentially lead to improved mechanical properties, including impact toughness.
However, it's essential to note that while the specified rate of heating and cooling may be lower than the maximum allowable limit, other welding parameters and procedures also play significant roles in determining the final mechanical properties of the welded joint. These parameters include preheat temperature, interpass temperature, welding technique, electrode selection, post-weld heat treatment (if required), etc.
Therefore, while the specified rate of heating and cooling may contribute to achieving desired mechanical properties, it's essential to consider all relevant welding parameters and procedures to ensure compliance with the applicable code requirements and the desired performance criteria for the welded joint.
Regards,
Amol K.Betkar
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P Goswami
Hello,
Please see the response below.
Regards.
P. Goswami, P. Eng, IWE.
From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of Gopalakrishnan G
Sent: Friday, March 15, 2024 2:39 AM
To: material...@googlegroups.com
Subject: [MW:34813] Clarification in Rate of heating and cooling.
dear expert
I have to do WPS and PQR details given below
Test coupon
Thickness -50 mm
Material - IS 2062 E 350 C
Code - ASME
Position - 3G
Process - SMAW
Electrode - E-7018
Impact = -20C @ 27J
Stress Relieving - 605+/- 10c
Rate of heating/cooling- 100c/hr.
Whether if Rate of heating / cooling is 100c/hrs will it affect the test result both UTS and Impact properties? : No, It’s the Exposure time at the PWHT Temperature which matters most towards the UTS & Charpy Impact values. As a matter of fact, there is no need to maintain a cooling rate of 1000C/hr. You may increase the cooling rate to 150Deg C /hr or more.
As per UCS 56 ASME SEC 8 div 1 Max rate of heating and cooling 222c/hrs divided by max.metal thickness.
As my client need Rate of heating and cooling 100c/hrs.
Plz kindly clarify.
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