| 摘要 |
PURPOSE:To improve strength of weld zones and welding quality by forming a bead pattern of laser beam spot welding into a square spiral shape and performing lap welding of inner cylinder rings and waveform plates adjacent mutually. CONSTITUTION:The inner cylinder rings 1 and the waveform plates 2 being adjacent mutually are pressed via a jig and the laser beam spot weld zones 3 where the prescribed quantities of gaps are held are formed. A laser beam machine is then set to the outsides of the inner cylinder rings 1 and the waveform plates 2 to perform laser beam spot welding on the spot weld zones while being shielded by N2 gas, etc. At this time, the bead pattern of the spot weld zones 3 is formed into the square spiral shape to shift from the center to the outside and laser beam machining is performed. By this method, ring 1 end fitting parts hold large welding areas and are subjected to laser beam spot welding. Accordingly, the need for brazing the weld zones is eliminated and welding strength is improved. Since welding is performed automatically, welding quality is also improved. |
