Interpass Temp.

[saleem manhappulath]

Dear Experts,

    how to check interpass temp. for a material

thanks 

saleem

[Amol Betkar]

Dear,

To check the interpass temperature for a material during welding or similar processes, you can follow these steps:

Tools and Equipment Needed:

1. Temperature Measuring Device: Typically, a contact or non-contact thermometer (e.g., infrared thermometer) or temperature-indicating crayons (Tempilstik).
2. Protective Gear: Wear appropriate personal protective equipment (PPE) such as gloves and safety glasses.

Steps to Check Interpass Temperature:

1. Preparation:

   • Ensure the surface is clean and free from any contaminants that might affect the temperature reading.
   • Identify the area where you will measure the temperature. Typically, this should be close to the weld zone but not directly in it.

2. Using a Contact Thermometer:

   • Place the probe of the contact thermometer directly on the material surface.
   • Hold it in place until the temperature stabilizes and take the reading.

3. Using a Non-Contact (Infrared) Thermometer:

   • Aim the infrared thermometer at the area where you want to measure the temperature.
   • Ensure the thermometer is at the correct distance as specified by the manufacturer for accurate readings.
   • Pull the trigger to take the temperature reading.

4. Using Temperature-Indicating Crayons:

   • Select a crayon with a melting point close to your desired interpass temperature.
   • Mark a small area on the material with the crayon.
   • If the crayon mark melts, the material is at or above the temperature indicated by the crayon. If it does not melt, the temperature is below the crayon’s melting point.

Best Practices:

• Consistency: Measure the interpass temperature consistently at the same location to ensure accurate monitoring.
• Accuracy: Calibrate your temperature measuring devices regularly for accurate readings.
• Documentation: Record the temperature readings to maintain a log for quality control and compliance with welding procedures.

Tips:

• Ensure there is good contact between the thermometer probe and the material surface for accurate readings.
• When using an infrared thermometer, avoid measuring reflective surfaces unless you have accounted for emissivity adjustments.
• Follow the manufacturer's instructions for using and calibrating your temperature measuring devices.

Safety Considerations:

• Be cautious of hot surfaces to avoid burns.
• Ensure that measuring devices are rated for the temperature range of your application.

By following these steps, you can effectively check the interpass temperature to ensure compliance with welding procedures and maintain the quality of your material.

Regards,

AB

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Best regards,

Amol K.B

B.E(Mech), CSWIP 3.2.2, NACE CIP 1 & ASNT LII(4M)