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If possible, the work piece should be positioned so that the bead will run on a flat surface. Preparing The Joint For effective welding, the surfaces to be joined must be free of dirt, rust, scale, oil or paint. Welding on metals not properly cleaned will cause a brittle and porous weld. If the base metal pieces to be joined are thick or heavy, it may be necessary to bevel the edges, with a metal grinder, at the point of contact, as shown below. The angle of the bevel should be approximately 60