Welded joint heat treatment
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What does it mean in 150.4 that for carbon steel, the values are greater than 32 and greater than 38 (with a preheating of 100°C before welding)? Does this mean that heat treatment is not necessary after preheating, or is it required to preheat first for materials with a value greater than 38 before undergoing heat treatment? Can anyone explain this?
Both pre-welding heating and post-weld heat treatment serve the purpose of improving the quality of the weld, but they are distinct processes; in most cases, both need to be carried out!
Different requirements apply depending on the material; preheating is necessary before welding, while post-weld treatment is required after welding – it is not necessary for all materials, and it depends on the relevant specifications
No preheating before welding; heat treatment after welding is required for thicknesses greater than 32 mm； Preheating is required before welding; heat treatment after welding is necessary for thicknesses greater than 38 mm.