Repair the cracks on the arm side plate of the mini excavator quote:
When checking whether the weld on the side panel of the welding machine is rusty, it is necessary to scratch or polish the paint or rust on the weld and hit the weld with a small hammer. If necessary, use a magnifying glass to investigate.
1.Cause of cracking
The reasons for cracks in the cantilever side plate of the excavator include the welding itself, small household excavators, as well as bubbles, slag inclusions and micro-cracks. When the excavator is overloaded, the original welds will crack and slowly expand. Cracks in the electrodes do not match the performance of the plates. Due to the large size of the excavator arm, it is difficult to choose a reliable and effective method. Heating and insulation methods. After welding, the hardened part of the base metal around the weld is not completely removed, which will reduce the welding strength: excavator. During operation, the vibration and impact are large, and the welded parts are damaged due to the uneven force on the welded parts.
2.Repair method
Preparation before welding: Use a grinding wheel to manually remove oil, paint, rust, etc. from the original weld. The boring machine cuts through weld cracks and cuts into the body of the side panels to remove hardened areas of the formerly welded base plates. After shaving, use an inclined grindstone to smooth the cut (the internal interface is polished into a V-shaped groove). After cleaning and painting, make sure you find and clean cracks.
According to the protection conditions at that time, select a 5mm electrode as the electrode, bake it at 350°C for 2 hours, and then insulate it with a welding current of 190 to 230A at 100°C to prevent the electrode from absorbing moisture. Before welding the excavator plate, the weld must be preheated to 150-250°C. During the welding process, the small orchard excavator can be welded to the segments and recycled symmetrically. Continue to be used during cooling of the weld. A hammer is used to strike the weld metal to relieve stress. When welding at the corners of side plates, in order to prevent or cause arc faults, continuous welding is required to improve joint stress.
Do you understand the modification of the mini excavator?
