Shoe Pouches,Portable Travel Shoe Pouch,Waterproof Nylon Travel Shoe Pouch,Shoe Pouch For Packing Dongguan C.Y. RedApple Industrial Limited , https://www.hpgbags.comThe "Plywood Solid Rib" Method for Welding Correction in Excavator Arm Bushing Repair
A W4-60 excavator experienced issues during unloading when the boom moved excessively, causing instability and tearing at the bottom of the boom. This led to a malfunction in the system. To resolve this, we applied the "plywood solid rib" method for reinforcement through welding.
First, we used the "drilling by light" technique to open the area. Instead of the traditional approach—lifting the cab and removing the pin manually—we drilled a 16mm hole near the edge of the pin in the driving part. Then, we inserted an iron bridge to pull out the pin, which also made it easier to align the axis and hole when reassembling. In field conditions, cutting a small hole with a gas cutter was also effective, saving about 80% of the time compared to traditional methods while ensuring safety and reliability.
Next, we applied the "plywood solid rib" method for welding correction. We first heated the area with an oxygen-acetylene flame, then used a press to straighten the structure and cleaned off any oil or dirt. We used E5016 low-hydrogen potassium electrodes with a 3.2mm diameter, DC reverse polarity, and a current of 100A. The process started with spot welding on one side, followed by the opposite side, and finally full welding to minimize deformation. After welding, we removed the slag and checked the weld quality. Then, we used an angle grinder to smooth the surface, making it easier for the plywood ribs to be attached.
Two sets of 300mm × 100mm × 10mm iron plates were used as the "plywood ribs," while 150mm × 100mm × 10mm plates were used for the sides. We adjusted the current to 110A, used a lap joint, held the electrode at a 45-degree angle, and performed a single-pass weld for better efficiency. Finally, we removed the slag to complete the repair.
Lastly, we employed the "moving car stepping" method. We lifted the end of the repaired boom using a crane, loader, or excavator, and then operated the excavator together (paying close attention to the inlet and return pipes to prevent oil leakage). As we stepped the boom into place, we aligned the base pin hole with the boom sleeve hole and lowered the boom carefully. We checked the alignment through the small hole drilled in the driver’s cabin and gently tapped the pin into the hole, completing the installation. This method not only reduced the weight and risk but also made the process more efficient and safe.
/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Recommended for Friends | Comments | Close Window
Bearing Related Knowledge
How to Perform Scraping on Sliding Bearings to Avoid Burning of Diesel Bearings?
SKF Bearing Temperature Detection
SKF Bearing Application Considerations
Motor Bearing Grease Functional Requirements
This article is linked to http://
Please indicate the bearing network at http://
Previous: Correct Use of Rolling Bearings and Common Problems (1)
Next: Influence of Oscillation Wear and Temperature on IKO Bearings and Countermeasures
"Plywood rib" method welding correction excavation maneuvering arm bushing
Source: China Bearing Network | Date: June 25, 2014