| 摘要 |
PURPOSE:To form weld zones which are good magnetically and mechanically with good efficiency by welding steel plates which are held in a butt state by means of clamping jigs and subjecting the welding parts locally to annealing and shaping simultaneously. CONSTITUTION:The parts near the butt joint 2 of steel plates 1 are held by means of clamping jigs 3. The plates 1 in this state are fed in an arrow 5 direction by means of rolls 7 and auxiliary feed rolls 8 rotating at the same peripheral speed. Upon starting of the feeding, a concentrated arc 41 is projected to the joint 2 by a welding torch 4 to heat the plates 1 to temp. above the melting temp. thereof and to form weld beads 6 successively. The formed beads 6 are pressurized and shaped by rolling of the rolls 7. The rolls 7 heat the plates 1 to the annealing temp. above, for example 800 deg.C and below the melting temp. of said plates by utilizing the resistance heating in the welded parts when electric current is supplied to the roll 7-the plate 1, the beads 6-the roll 7, whereby the annealing of the welded parts is accomplished simultaneously. |
