Electromechanical switching device utilizing contacts on aluminum conductors and method of adhesion

A method of making an electrical switching device, comprising:

• percussion welding a first contact to a first substrate to form a first static contact assembly,
• percussion welding a second contact to a second substrate to form a second static contact assembly, and
• percussion welding third and fourth contacts to a third substrate to form a movable contact assembly,
• arranging the first and second static contact assemblies relative to each other such that the first static contact assembly is separated by a gap from the second contact assembly,
• arranging the movable contact assembly such that the movable contact assembly is movable between an engaged position where the movable contact assembly makes an electrical connection between the first static contact assembly and the second static contact assembly, and a disengaged position where the movable contact assembly does not make the electrical connection between the first static contact assembly and the second static contact assembly,
• connecting the movable contact assembly to an activator that when actuated, moves the movable contact assembly to the engaged position, and
• connecting the movable contact assembly to a spring that moves the movable contact assembly to the disengaged position when the activator is not actuated,
• wherein the first contact, the second contact, the third contact, and the fourth contact each comprise silver,
• wherein the first substrate, the second substrate, and the third substrate each comprise aluminum, and
• wherein the first contact, the second contact, the third contact, and the fourth contact each include, prior to the percussion welding, a projection that focuses an arc during the percussion welding.