| 摘要 |
The present invention relates to a filler metal used in welding of a metal material comprises a number of line material groups in various arrangements in a manner that a parent material is rolled onto a flat plate of below 1 mm in a first rolling process, the rolled plate is cut in a first rolling process to form a diameter φ of the line material of below 1 mm (φ<1 mm), a plurality of line materials are cleaned, rolled, heat-processed and cold-worked in turn to form the diameter of several mm<φ<0.3 mm, a plurality of the line materials are combined with each another in a number of bundle arrangements to form a group, and a number of the line material groups are combined with each another to form a core material and a manufacturing method thereof. |
