We claim the ornamental design for a welded end effector, as shown and described.
FIG. 1 is an isometric view of a welded end effector showing our new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is an axial front end view thereof; and,
FIG. 6 is an axial rear end view thereof.
The broken line showing in the figures is for the purpose of illustrating portions of the welded end effector and forms no part of the claimed design. The broken away symbols in the drawings indicate that any portion of the article between the break lines forms no part of the claimed design.