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In order to prevent the square tube from showing the defect of hot cracking, we can take the following eight measures: (1) According to the pipe structure, size, length and width, thickness, etc., design a correct and reasonable gating system structure and setting position. In the process of condensation line shrinkage, ensure the temperature difference is balanced, and then solidify in order to make the square tube shrink normally and freely. （2） According to the mud core structure, the core bone structure shall be manufactured with corresponding rigidity
