What are the welding requirements for large storage tanks?
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Release time：2025-07-24
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For the storage of vast quantities of materials, large-scale storage tanks are required. Typically, these large storage tanks are constructed by welding together multiple small metal sheets. Therefore, stringent requirements must be imposed on the welding process to ensure the high quality of these large storage tanks.
The welding requirements for large storage tanks cover multiple aspects, including materials, processes, operations, and quality control. First, material selection must undergo rigorous re-inspection; steel grades used for the first time must undergo process qualification according to established standards to determine appropriate welding parameters. For butt welds in tank walls with high tensile strength and substantial plate thickness, low-hydrogen electrodes should be used. Before use, welding consumables must be dried and properly stored.
During welding operations, ensure that the bevel and both sides are clean and dry, free of impurities such as dirt, sand, and rust. Arc initiation and arc termination should be performed within the bevel to prevent arc crater cracks. For double-sided welded butt joints, root preparation is required before welding on the back side; after root preparation for low-alloy steels, penetrant testing must also be conducted. Welding operations must not be carried out under special weather conditions, such as rain or snow, excessive wind speeds, or temperatures that are too low.
The welding sequence is crucial for minimizing deformation and stress. For example, on the middle deck plate, short welds should be completed before long welds; welders must arrange their work symmetrically and employ a segmented backstepping technique. As for tank wall welding, longitudinal welds should be completed first, followed by circumferential welds, ensuring that the welding directions remain consistent.
In addition, when welding stainless steel storage tanks, it is necessary to use a process with low heat input and short arc length. Welds with high corrosion resistance requirements should be welded last. After welding is completed, non-destructive testing must also be performed to ensure that the weld quality meets the relevant standards.
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What are the welding requirements for large storage tanks?
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