Boom and dipper stick construction

摘要

A boom and dipper stick construction for mobile excavators and an improved method of manufacturing the same. The boom and dipper stick are fabricated from side plates that are butt welded together with respect to various hinge point locations to eliminate the necessity of doubler plates on the sides of the structures. The butt welds are located at non- critical areas to provide for even stress flow and ease of manufacture. PPA method of welding together the side plates of the boom and dipper stick construction in an end to end abutting relationship in a manner which attains a complete weld penetration over the entire length of the joint.