Abstract
Throughout the GTA welding (GTAW) process, bead width (Bw), bead height (Bh), penetration depth (Dp), and metal transfer modes change in accordance with welding current and wire feeding speed. Various processes employing GTAW include text marking welding systems that have bead width and bead height as the main management items, and some such processes require sufficiently complete penetration. It is judged that there will also be a metal transfer type advantageous for welding the first layer of the pipe root gap. Accordingly, a bead shape prediction model in GTAW has been proposed according to changes in welding current and wire feeding speed, wherein the bead shape change and metal transfer change interval are presented for the heat input ratio (HIR) change.
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