Flux-cored wire for dissimilar material welding, dissimilar material laser welding method and dissimilar material MIG welding method

摘要

Disclosed is a flux-cored wire (1) for use in the laser welding or MIG welding of different materials that are aluminum or an aluminum alloy material (2) and a galvanized steel material (3). The flux-cored wire (1) comprises a cylindrical sheath constituted of an aluminum alloy containing 0.8-1.9 mass% Si, with the remainder being aluminum and incidental impurities, and a flux filled in the space within the sheath and containing 20-60 mass% cesium fluoride. The incidental impurities in the sheath include Mn, Mg, or Fe, and the contents of these impurities are at most 0.1 mass% each with respect to the total mass of the sheath. The percentage filling of the flux is 5-20 mass% with respect to the total mass of the wire.