Heat preservation, or post-weld heat treatment (PWHT), is crucial for large pipeline cylinders after welding. This process involves controlled heating and cooling to relieve residual stresses, reduce hardness, and improve the toughness of the weld area. Here are some key benefits:
- Stress Relief: Reduces residual stresses that can lead to cracking and structural failure.
- Improved Toughness: Enhances the toughness of the weld and heat-affected zone, making it less prone to brittle fracture.
- Reduced Hardness: Lowers the hardness of the weld area, which can improve its resistance to wear and fatigue.
- Enhanced Durability: Increases the overall durability and lifespan of the pipeline by ensuring a more uniform and stable microstructure.
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