Selection And Preparation Of Welded Stainless Steel Tubes Materials

When welding stainless steel tubes, the selection of welding wires and electrodes must be strictly in accordance with the requirements of relevant standards and specifications. Before welding, all electrodes must be dried at a high temperature of 350 degrees and kept at a constant temperature for one hour, and cannot be repeatedly baked. Before using the welding wire, pay attention to removing the oil and rust on the surface of the welding wire until the metallic luster is exposed. When the welding rod is in use, it should be put into a special heat preservation brief for heat preservation of 80 degrees to 120 degrees, so that it can be used at any time.

The selection of the electrode should generally refer to the material of the weldment. Since austenitic stainless steel is mainly corrosion-resistant and is also used as low-temperature steel and heat-resistant steel, the performance of the selected electrode should be consistent with the use of stainless steel. Usually, the electrode is selected to be similar to or the same as the base metal, and the corrosion resistance of austenitic stainless steel is greatly affected by the carbon content, so the electrode with a lower carbon content in the deposited metal than the base metal can usually be selected. The weld metal of the weldment must ensure its mechanical properties, so it can be verified by the qualification of the welding process. When austenitic heat-resistant steel works under high-temperature conditions, it is necessary to select electrodes that can meet the high-temperature performance of the welded joint and the thermal crack resistance of the weld metal.

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