The ornamental design for an adapter for an electrode for electric welding, as shown and described.
FIG. 1 is a front elevational view of the adapter, illustrating my new design, the front and rear of the adapter being mirror images of one another;
FIG. 2 is a right elevational view of the adapter, the right and left sides of the adapter being mirror images of one another;
FIG. 3 is a top plan view of the adapter;
FIG. 4 is a bottom plan view of the adapter;
FIG. 5 is a cross-sectional view of the adapter, taken through Line 5-5 of FIG. 3; and,
FIG. 6 is a front elevational view of the adapter similar to the view of FIG. 1, illustrating environmental structure in broken lines. The structure shown in broken lines forms no part of the claimed invention.