Making a tough sword

The hole marker for one of the pirate themed mini golf greens is a good sized sword that will be stuck firmly into a pumpkin. The sword needs to be extra sturdy as we know from experience that many thousands of guests will give it a tug to see if they can pull it out. The pumpkin will be carved from concrete over a welded steel armature. The 1/4” thick base plate will be securely bolted to a concrete foundation. The sword is just as tough, made from four 1/4” thick plates welded together and round to a sword shape. The sword hilt and handle are made from schedule 40 pipe. The decorative skull is welded up using plasma cut steel and a steel ball. It is as strong and I can make it and it should be qable to handle whatever guests can do to it over many years of use.