Development of High-Deposition Rate Horizontal Welding Process with Electromagnetically Controlled Molten Pool

摘要

Horizontal welding used in large-scale steel structures causes welding beads to drop due to gravity, which makes horizontal high-deposition welding difficult. We developed high-deposition welding in which 2 filler wires are inserted in the front and back of a molten pool and current conducted between them. A magnetic field applied to the pool generates an upward electromagnetic force that improves welding bead shape. Joule heating increases wire deposition rate. We show calculation of electromagnetic force in the pool and weld test results. We found that bead shape was dramatically improved enabling high-deposition. The process was applied to a large scale steel structure and its practicality confirmed.