Quality control of tube sheet welding technology begins with pre-welding preparation. Strictly inspect the cleanliness of the tube sheet and tubes, and the accuracy of bevel preparation, ensuring that the assembly gap meets the standards. Select appropriate welding materials and perform baking treatment to prevent moisture residue from causing porosity. Welders must be certified and receive specialized training, familiarizing themselves with the specific process requirements of tube sheet welding.
Welding process control is crucial. Use the TIG welding process for the root pass, strictly controlling welding parameters such as current, voltage, and speed. Implement multi-layer, multi-pass welding, cleaning the slag after each layer to ensure good inter-layer fusion. Use weaving techniques to avoid slag inclusion and lack of fusion defects.
Post-weld quality inspection is indispensable. Use radiographic testing or ultrasonic testing to perform non-destructive testing of internal weld defects. Develop repair plans for unqualified welds, limiting the number of repairs to ensure that the final welding quality meets design and usage requirements.
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