Repair welding measures can also be taken. When the reducer was disassembled and repaired, it was found that there were many cracks, wear and blockage on the second-stage cycloid pin wheel of the reducer. When repairing welding cracks, the roots must be thoroughly cleaned with a grinder before welding on the back to expose the metallic luster. Because this part requires good wear resistance and high precision, but poor weldability, stainless steel electrodes with good crack resistance, wear resistance and good machinability are selected as filler materials.

The welding machine is AX-320, reverse connection. After welding, the whole part is kept warm and slowly cooled after welding. According to the shape, depth and length of the crack, a grinder is used to eliminate shallow and short cracks first, and then to eliminate long and deep cracks. The repair welding sequence is to weld short and shallow cracks first, then weld through cracks, and finally surfacing the defective Wholesale Cycloidal Gear Reducer parts to the original shape.22mm, it is heated to 350 ℃ and bake for 2h, the welding current is 90-l00A, the welding voltage is 20-22V, and the welding input energy is 8-12kJ/cm.

During the construction of the tower crane, the tower body suddenly failed to rotate. When repairing short and shallow cracks, pay attention to starting the arc from the tail of the crack first to prevent cracks from appearing in the welding process, weld point by point, and observe while welding. Weldability analysis shows that the material of the cycloid pin wheel is GCr15, which has high carbon content, high hardening tendency, cracks and S and P segregation, high thermal cracking sensitivity, and poor weldability. The cycloidal needle wheel can be used for more than 5 years after self-repair.

It has good performance, fully meets the requirements of use, and saves maintenance costs. Because there are no spare parts in stock, it was decided to repair by welding. For uncracked cracks, smooth transition at the bottom of the groove to reduce stress concentration; for cracks with cracks, a single V-shaped groove is opened. The grinding sequence starts from the end of the crack until the crack disappears to prevent the crack from spreading, while grinding the groove. The brand is A307, the specification is ￠3.

After cooling to room temperature, the two planes are processed on the lathe, and the excess surfacing metal on the edge is trimmed with a file until the cycloid pin wheel returns to its original geometric size. Correct the crack to make its surface in a plane, and fix it by spot welding. For worn and defective parts, oil stains and rust should be removed before repair welding. Through the observation of the first crack repair welding, no cracks appeared, and no new cracks appeared, which proved that the welding process was feasible.

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