Abstract
Paying special attention to the arc force, the welding phenomenon of high speed one-side welding of thin sheet was investigated.In high speed and high current one-side welding method, the arc force becomes very strong. The solid surface is produced at the front part of the molten pool by this strong arc force and others. But the high speed one-side welding of thin sheet is possible using high current TIG and plasma arc welding method because the strong arc force effects to this solid surface. However, in the case of these welding, the face bead becomes undercut bead.In spite of high welding current, the arc force holding forward torch angle keeps lower level. So this method is more effective for high speed one-side welding. Especially, using the knife-edge electrode with forward torch angle, these tendency becomes more effective.
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