The geometrical fine adjustment of circular honeycomb structure using laser welding

摘要

The circular honeycomb structures are made of formed thin sheet for the lightweight structure. In the muff joint the muff must be pressed in the circular honeycomb structure. There can be problem with the adhesive friction and bonding during the installation pressing of the muff. The idea is that the structure is designed a bit loose and the diameter of the structure is decreased to the necessary installation tolerance by the thermal effect of the laser in the area of final installation. The heat influence of the laser weld shortens the thin plate. Therefore it can be used in order to decrease the diameter of circular thin sheet honeycomb structure. In the first stage of the study the 1.5 mm thick and 860 mm length sheet plate was shortened 0.68 mm with the contribution of 32 laser welds. In the second stage of the study the diameter of the circular honeycomb structure made from 1.5 mm plate was decreased by using laser welding. The 239.5 mm diameter of honeycomb structure can be decreased for 0.38 mm which is just enough to achieve a sufficient installation tolerance of the inner muff. The laser weld treated circular honeycomb structure was not distorted but the installation of the muff was easy and the installation tolerance was just enough tight for the good attachment of the muff.