Square & rectangular tubes are originally products with stable performance and high quality. However, during actual use, we may still find loopholes in some products. Items with obvious cracks cannot be used immediately. Otherwise, the sealing performance is likely to be reduced and the specific application requirements may not be met. So, why are there gaps in the surface of this product?
There are many reasons for cracks in square and rectangular tubes. Cracks are likely to occur in actual applications, and cracks are likely to occur in manufacturing. If cracks occur during the production process, they are most likely caused by electric welding or the raw materials. For example, if the material itself for producing the product has cracks, the seamless steel pipe produced must have cracks. The welding process used in manufacturing is already very hot during the welding process. During the welding process, a large external tensile force is suddenly added to the material under high temperature conditions. This is generally caused by lifting. Due to the tensile force, there is a high probability of cracks occurring in the electric welded part and part of the periphery of the electric welded part. The second reason for cracking is cracking during use. For example, different application environments have different requirements for electric welding. If the internal pressure during actual use is too high, the welding and connecting parts may not be able to adapt to the internal pressure. Under the action of the pressure, the connecting part and the welding part will be broken by the pressure and cause cracks.

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