Why do bubbles appear in square tubes during the production process?

I believe many people have seen square tubes, but during the production process of square tubes, bubbles are prone to appear. So why? Today, the square tube manufacturer will share with you what exactly is going on? First, the dissolved gas is in a supersaturated state; second, the sum of the partial pressures of various gases in the bubble is greater than the external pressure acting on the bubble; third, there is a bubble core that is greater than critical. Under actual casting conditions, since there are always a large number of non-metallic inclusions, combinations and bubbles that did not escape during refining in the melt, non-spontaneous bubble nuclei are easily formed in the melt. In addition, although the hydrogen content of the melt after refining is lower than the equilibrium concentration, the gas concentration redistribution during the solidification process causes local hydrogen content in the liquid at the crystallization front to be supersaturated, thus forming a galvanized pipe. Bubbles create favorable conditions. When the hydrogen partial pressure in the liquid at the crystallization front increases above the external pressure, bubbles may form. However, if the buoyancy force of the formed bubbles is less than the adhesion force of the solid surface to the bubbles, or the bubbles' buoyancy speed is less than the crystallization speed of the ingot, the bubbles will stay in the ingot and become pores. The cross-section of each layer of thick-walled square tubes is very small, and the heat required is also very small. GNEE STEEL thick-walled square tube manufacturers also divide each layer into several sections for jump welding. Each section is basically cold. The temperature field is re-established on the steel plate, and a narrow plastic deformation zone appears each time. Therefore, the average width of the plastic deformation zone (i.e., the size of the transverse shrinkage) is smaller than that of the corresponding layered through welding, and the longitudinal shrinkage is also smaller. Compared with The deformation of swing welding that is filled continuously once is smaller. Square pipe is a name for square pipe, which is a steel pipe with equal side lengths. It is made of strip steel rolled through process treatment. Generally, the strip steel is unpacked, flattened, curled, and welded into a round tube, which is then rolled into a square tube and then cut to the required length. Usually 50 pieces per pack.

After listening to the introduction by the editor of the square tube manufacturer, I believe you must have an understanding of why bubbles appear during the production process of square tubes? If you need help, you can contact the online customer service of our website, we will serve you wholeheartedly!