1. If the rivet head of the impeller is worn, it can be welded by welding the impeller body and the hub to return the worn rivet head to its original normal state.
2. For the case where fatigue cracks are likely to occur at the rivet holes, the new welding rods that have not been used may be used for welding and repairing cracks, but the symmetry of the impeller axis is centered, and the remaining welding rods of the cracks are repaired.
At this point, a new electrode is used to repair the rivet hole crack. The remaining electrode after welding is as long as the remaining electrode when the symmetrical rivet is repaired to ensure that the weight of the weld is equal. If there is no crack at the symmetrical rivet hole, the electrode should be welded here to offset the newly added welding weight at the symmetry rivet hole crack. According to this method of symmetrical compensation, the crack can be repaired by welding.
3. Simple dynamic balance test on the impeller is also very simple. After the impeller is lifted up, move it by hand to make it gently rotate. If it is not balanced, it will stop at the low point and swing left and right.
4. If there is weight, you can spot weld on the opposite impeller, increase the weight to make it balance, or use the angle grinder to grind away the weld marks of the heavy impeller, and also reach the balance, so that the fan can be repaired and normal work. Note that in the repair process of the fan, it is not possible to use spot welding for spot welding, and leave the weld mark on the impeller so as not to affect the balance of the fan impeller, and the purpose of repair cannot be achieved, resulting in greater loss.