高速すみ肉CO_2アーク溶接の品質向上対策

概要

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Recently, the improvement in productivity has been urgent in the shipbuilding industry, and the automation and mechanization of factory processes have been carried out at Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI). One of them is the "unit-panel" process, which is a modularized process for flat hull blocks. The unit panel is composed of one flat skin plate and the several longitudinals which are fillet-welded on the skin plate. This is mass-produced on the conveyor line efficiently. In the production of this unit, automatic CO_2 arc welders of high-speed, set up in tandem, have been developed to fillet-weld a maximum of five longitudinals simultaneously. During it's introduction, welding defects such as pits and blow holes occurred frequently in the deposited metal. Since it was understood that these defects were caused by the primer coating on the surface of the web plate there to prevent rust, a device to brush the surface shortly after the primer coating was applied, was devised, and the experiments using this equipment were repeated. As a result, the welding defects were made under the allowable level. This report outlines these tests and solutions.
2004-03-20