Arc welding robots are used in most welding processes in automotive manufacturing. The robots weld steel sheets that have been press formed into complicated three-dimensional shapes. The press-formed sheets require high dimensional accuracies. In reality however, the accuracies of press-forming are limited, causing problems such as variations in root openings and in gas metal arc welding (GMAW) wire target positions. The variations often cause welding discontinuities such as misalignment and melt-through, increasing the worker hours involved in fixing such discontinuities. High-speed welding is desirable for efficiency; however, excessively high speed can cause problems such as undercuts, convex beads, and insufficient bead width, which again increases repair time. Most of these problems are solved by reducing welding speed to secure bead width; however, that solution is not feasible in terms of efficiency and cost. A means for solving the above problems in high-speed welding is to make the bead wider by adjusting the shape of the bead penetration. A wide bead width helps weld quality by reducing discontinuities, and it is desirable for welding thin steel sheets. Another aspect in weld quality assurance is to further reduce slag, which tends to peel paint coatings off. In response to such needs, a new GMAW wire, SE-A50FS, was developed that provides wide bead widths and generates minimal slag. Efficient measures to control the properties of the molten pool during GMAW through the composition of the wire are presented.
New welding wire for thin steel sheet
Welding Journal, New York ; 89 , 3 ; 34-38
2010
5 Seiten, 9 Bilder, 5 Quellen
Article (Journal)
English
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