Gougingless full penetration welding method and welded joint

摘要

A gouging-less full-penetration welding method for welding a first steel plate and a second steel plate without performing gouging includes: a step of repeating weaving at a welding current of 130 to 300 A between the first steel plate and the second steel plate, thereby forming an initial weld bead having a continuous single or a plurality of continuous layers between the first steel plate and the second steel plate; a step of conducting single- or multi-layer welding from a front side; and a step of conducting single- or multi-layer welding from a back side.