Machine Equipment Forums

1, the reason for the crack: excavatorcantilever side plate cracks: including the weld itself, domestic small excavator, as well as bubbles, slag inclusion and small cracks. When the excavatoris overloaded, the original weld will have small cracks and slowly expand: the welding rod cracks do not match the function of the plate: because the excavatorboom is large, it is difficult to adopt reliable and effective heating and insulation measures. After welding, the hardened area of the matrix material around the weld is not completely eliminated, resulting in a decrease in the strength of the weld: excavator. During operation, the vibration and impact are large, and the weld cracks because of the uneven force on the weld.

2. Repair method: Preparation before welding: manually remove oil, paint and rust in the original weld cracks with the grinding wheel. The weld crack is cut with a perforator into the body of the side plate and the hardened area of the previously welded substrate is removed. After planing, use an Angle grinding wheel to lubricate the cut (the inner interface is polished into a V-shaped groove). After cleaning and painting, it is acknowledged that cracks have been found and cleaned.

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