| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a flux cored wire for welding with which even in the case of developing the wear of a plasma arc welding torch or the stuck material onto a tip or an electrode, suitable joined part can be obtained and even after shrinking the diameter, crack on the outer shell of a welding pipe is not developed. SOLUTION: In the method for producing the flux cored wire for welding, with which a steel strip is formed into U-shaped body, and after supplying the flux in the U-shaped body, this body is formed into a pipy body, and after plasma-arc welding both edge surfaces of this pipy body, this diameter is shrunk, a relation between the temperature of weld bead and the depth of penetration formed with the plasma-arc welding, is beforehand obtained, and the depth of penetration is kept to the constant by adjusting welding condition based on the measured result of the temperature in the weld bead. Further, the adjustment of the welding condition is performed with welding current or flow rate of pilot gas. COPYRIGHT: (C)2003,JPO
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