How to repair the crack on the side panel of excavator arm

Nov 22nd,2024 436 Views

1. Causes of cracking

The causes of cracks in the side panels of the excavator cantilever beam include the welding itself, small domestic excavators, and bubbles, slag inclusion, and micro-cracks. When the excavator is overloaded, the original weld will crack and slowly expand. The cracks in the electrode do not match the performance of the plate. Because of the large scale of the excavator arm, it is difficult to choose a reliable and useful method. Heating and insulation methods. After welding, the hardened part of the base material around the weld is not completely removed, which will reduce the welding strength: excavator. During the operation, the oscillations and shocks are large, and the welded parts are damaged because of the uneven force of the welded parts.

2. Repair methods

Preparation before welding: manually remove the oil, paint and rust on the original weld with the grinding wheel. The boring machine can cut the weld crack and cut into the body of the side plate to remove the hardened area of the previously welded substrate. After shaving, smooth cut (internal interface polished into V-shaped grooves) with a crooked grinding stone. After cleaning and painting, make sure that cracks are found and cleaned.

According to the protection conditions at the time, a 5mm electrode was selected as the electrode, baked at 350°C for 2 hours, and then insulated at 100°C with a welding current of 190 to 230A to prevent the electrode from absorbing water. Before welding the excavator plate, the weld must be preheated to 150-250°C. During the welding process, small orchard diggers can be welded to the sections and recovered symmetrically. Continuous operation during the cooling of the weld. A hammer is used to strike welded metal to relieve stress. When welding at the corner of the side plate, in order to prevent or cause arc defects, it is necessary to perform continuous welding to improve the joint stress.

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