| 摘要 |
A method for producing open cored wire for electric arc welding, in which a metal strip is subjected to a preliminary shaping stage to make it assume a concave profile suitable for filling with a welding powder mixture, said strip preliminary shaped in this manner then being filled with said powder mixture, and then subjected to a final shaping stage to join the longitudinal edges of said strip filled in this manner, to obtain an open cored wire which on termination of the process is fed to spooling and packaging, characterised by subjecting to said preliminary shaping stage a streel strip with a surface coating of a metal having a hardness less than and a coefficient of electrical conductivity greater than those of steel, then spooling and packaging the cored wire directly obtained from said final shaping stage. |
