What are the advantages and disadvantages of various welding methods for bridge cranes?

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The drive wheels of bridge cranes and their main gear reducers operate frequently; repeated sudden starts, stops, and reversals exert increased torque and vibration on the axes of these reducers, which in turn can lead to leakage. In the event of leakage, traditional methods mainly involve patch welding or brush plating followed by machining to make repairs. However, the thermal stress generated by the welding at high temperatures cannot be completely eliminated, leading to bending or fracture ； Brush plating is limited by the coating thickness and tends to peel off; moreover, since both of these methods involve using metal to repair metal, combined forces can lead to further wear. To address the shortcomings of traditional welding repairs for bridge cranes, new repair methods have now been developed, which rely on polymer composite materials. These materials possess excellent adhesive strength, as well as outstanding comprehensive properties in terms of compressive strength. Using polymer materials for repair eliminates the effects of heat stress from welding, and there are no restrictions on the repair thickness. At the same time, the product possesses a ductility that metal materials lack; it can absorb the impact and vibrations of equipment, preventing further wear and thus extending the service life of its components.