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What should we pay attention to when repairing large diameter stainless steel pipes?
What should we pay attention to when repairing large diameter stainless steel pipes?
Generally speaking, the outer diameter of the zero-cut stainless steel pipe is generally more than 89, or the meter weight is more than 20 kg, especially the large-diameter stainless steel pipe is used for cutting and selling more. The length of the zero-cut stainless steel pipe is more than 150mm, and the longest is not more than 3m.
Before repairing large-diameter stainless steel pipes, use acetone or alcohol to clean the oily and ineffective debris at the joints, and use plasma cutting to cut the cracks, which should be polished to metallic luster. It is not allowed to directly strike the arc on the non-welding surface of stainless steel during welding. During arc welding, there should be an anti-spatter layer within a range of 100mm on both sides of the joint to remove spatter.
When repairing large-diameter stainless steel pipes with anti-intergranular corrosion requirements, the welding process specifications should be strictly implemented during welding, and the interlayer temperature of the weld bead should be strictly controlled. When the weld bead is cleaned, the carburized layer should be polished clean. The repaired parts still need to ensure the original requirements.
The repaired large-diameter stainless steel pipe should be pickled and passivated. Generally, the pickling and passivation is mainly based on the dipping method, and the wet dragging method or the paste smearing method can also be used.
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