The effect of welding defects After the bolts and copper plates are welded by fixed-point resistance, if there is no welding defect, the continuity of the weld is destroyed, resulting in a decrease in the strength of the weld and artificially causing a source of fracture. During use, under the action of the vibration force of the continuous casting Machine mechanical system, the stress is concentrated and expanded at the source of the fracture. When a bolt is broken and the weld is broken, the binding force between the copper plate and the spare plate is not balanced. Under the action of high temperature, since the thermal expansion coefficients of the two materials of the copper plate and the standby plate are different, the bolts falling near the bolt are subjected to the expansion stress. In this way, when there are welding defects in the nearby bolt welds, stress concentration is inevitably formed at the defects, which eventually leads to the breakage of the nearby bolts and the loss of the fastening function.

The position and temperature effects are in the 2nd row and the 3rd row from the position of the bolts broken by the open welding, because this position is precisely the position of the molten metal surface in the crystallizer and the highest temperature in the crystallizer. The position of the bolt at this location is also the most affected by the temperature. At the same time, the Boshan centrifugal pump has a large thermal expansion of the copper plate, and the copper plate expands and deforms inwardly, and a tensile stress is applied to the fastening bolt. In addition, there is a welding defect, which inevitably causes the defective bolt to be broken and broken in advance. The reason for the early failure of the bolt is that there is no welding defect in the weld after the bolt and the copper plate are welded, which destroys the continuity of the weld and reduces the strength of the weld. During the operation, it is subjected to various stresses to make the bolt Early break welding failure. Suppliers are advised to further study the welding process or to study the mechanical connection of the bolts to the copper plate.

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