  This paper investigates a particular type of wormhole. The wormhole solutions
studied are obtained by sewing together two static, spherically symmetric,
charged black-hole metrics at their horizons. The charged wormholes are in a
background Kalb-Ramond field, which is the source of the necessary tension in
the gravitational field. The metric-tensor elements are studied by numerically
solving Einstein's equations with stress-energy-tensor elements given by the
combination of static electric and Kalb-Ramond fields. For a certain range of
electric charge the tension is positive away from the wormhole throat, but the
tension is negative near the throat, making it non-traversable. The wormholes
are found to be quasi-stable against decay via gravitational instanton
tunnelling.
