Heat treatment timing for SH3408 fittings
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SH3408 standard steel plate butt weld elbow, Q345R; the elbow components are hot-pressed into shape and then assembled and welded together. According to standard requirements, normalizing heat treatment is necessary. This heat treatment should be carried out before welding or after welding – that is, after all welding is completed, or after the parts are pressed together before carrying out the welding. I earnestly ask for the guidance of experts.
Normalizing after tabletting is preferable; if normalizing after welding, the welded specimens must pass the evaluation.
Will the lamellae formed by segmented compression deform severely upon reaching the upper transition temperature?
After the flaps are pressed together to form the structure, the joints are reinforced with spot welding; thereafter, normalizing is carried out. Finally, the spot welds used for positioning are removed during welding