As the most important stressed part of the equipment, the welding quality of the excavator boom is directly related to the overall quality and performance of the excavator. After welding, the excavator boom also needs to carry out a series of processing, such as boring the inner hole, milling the end face, processing the assembly hole of the bucket rod and oil cylinder, and the processing of these parts has high requirements for accuracy. Once there is a problem in welding, it is likely that other components cannot be installed, resulting in product scrapping and direct economic losses. Therefore, the welding process of excavator boom is very important. This article will explain the problems that are easy to occur during boom welding.
1. Welding deformation
The main reason is that the fillet weld adopts multi-layer and multi-channel high current MAG welding. During welding, due to the welding stress, there is a certain degree of deformation and distortion at both ends of the boom, resulting in the error displacement of the screw hole or jack on the boom on the plane and the displacement of the opening size between the boom plates, Once the displacement exceeds the limit value of its production specification, the product is defective.
2. Welding cracks
The main reason is that there are many welds on this type of excavator, including the welding joints between upper and lower cover plates, front and rear side plates, cover plates and side plates, side plates and middle beam cylinder. Due to the sealing of box girder section, its rigidity is large and the welds are dense. After each welding, there will be an uneven temperature distribution, This leads to cracks caused by large residual stress during steel welding.
