Welding machine and welding method

Abstract

In a welding machine and welding method, for welding cylinder members together about an outside diameter, which prevents the cylinder members from being deformed and corrects the deformation of a portion to be welded, a laser beam, generated by a laser generator, is dispersed in two directions by a spectroscope. The laser beams focus on an outer cylinder member using two optical heads, respectively, in a plane perpendicular to a center axis of outer cylinder member. The optical heads are separated from each other by approximately 90 degrees in the plane. The outer and inner cylinder members are welded to each other in the circular direction using laser beams. Therefore, directions, in which the cylinder members are deformed due to the laser beams, are perpendicular to each other creating uniform radial deformation.

1 - 3 . (canceled)  
   
   
       4 . An injector to be assembled by welding, the injector comprising: 
 a valve body including a valve seat;    a valve member for stopping fuel injection when seated on the valve seat, and for permitting fuel injection when separated from the valve seat;    a movable core connected to the valve member at an opposite side of the valve seat, the movable core reciprocating together with the valve member;    a fixed core disposed opposite the valve member relative to the movable core, the fixed core facing the movable core;    an electromagnetic driving device for generating magnetic force by which the movable core is attracted to the fixed core; and    a housing member of which an inner peripheral wall is connected to an outer peripheral wall of the valve body, the housing member containing the movable core so as to reciprocate therein, wherein:    each of the housing member and the valve body is a cylinder member; and    the valve body is inserted into the housing member, and they are welded to each other by melting them about a circumference of the housing member.    
   
   
       5 . The injector according to  claim 4 , wherein: 
 each of the valve member and the movable core is a cylinder member; and    the valve member is inserted into the movable core, and they are welded to each other by melting them about the circumference of the movable core.    
   
   
       6 . The injector according to  claim 5 , wherein: 
 the injector includes a magnetic member, disposed outside the housing member and the fixed core, for magnetically connecting the housing member and the fixed core;    the magnetic member is a cylinder member; and    the housing member is inserted into the magnetic member, and the housing member and the magnetic member are welded to each other by melting them about the circumference of the magnetic member.    
   
   
       7 - 21 . (canceled)