Spot welding assembly with pivotable electrodes

A spot welding assembly comprising:

• a base;
• a base electrode coupled with said base for supporting a first work piece;
• a welding gun movable toward and away from said base along an axis A;
• a gun electrode coupled with said welding gun for supporting a second work piece and for locating the second work piece against the first work piece upon movement of said welding gun toward said base to allow the first and second work pieces to be welded to one another;
• said base electrode being pivotable relative to said base and presenting a convex hemispherical base electrode portion disposed in mating and pivotable relationship with a concave hemispherical base portion of said base;
• said base electrode defining a passage extending axially through said base electrode to said convex hemispherical base electrode portion, and
• a weld pin disposed within said passage and extending from a bottom weld pin end disposed adjacent said convex hemispherical base electrode portion to a tip.