PWHT: Post-Weld Heat Treatment
PWHT is a controlled heat process for reheating the metal after welding in order to ensure the material strength.
- Reduces residual stresses of material
- Controls hardness of material
- Enhances the strength of material.
PWHT
PWHT Heating Process Example
The temperature patterns for PWHT are defined by ASME regulations. Pattern (Ex. Soak temp / time) differs depending on the thickness and material typeHow the recorder is used
Recorder is used to Measure both temp of metal and controller value.Controllers and TC both are connected to recorder
T/C points
Not only temp pattern but No of T/C numbers also change according to the thickness, material, and size Ex) *Pipe diameter 305mm or less, More than 1 number of T/C * Pipe diameter 610mm or less, More than 2 numbers of T/C * Pipe diameter 610mm or more, More than 4 numbers of T/CEach CH setting has to be changed every time when starting PWHT process.
We CHINO provides the best solution for your PWHT related recording and reporting needs
PWHT software with AH4000Applicable Products
AH4000 Dot printing type
DB670
