The problem with cannons eventually ended up being solved by just making a big, slightly irregular piece of metal and then boring a precise hole down the middle of it.
There was also another technique called spiral welding in use in the Middle East and Central Asia that apparently worked pretty well. IIRC when the British captures the Bengali cannons after the battle of Plassey they were very impressed by the tubes if not the carriages. They ended up spiking them because the bore widths weren't standardized but they could fire further than the English cannons.
There was also another technique called spiral welding in use in the Middle East and Central Asia that apparently worked pretty well. IIRC when the British captures the Bengali cannons after the battle of Plassey they were very impressed by the tubes if not the carriages. They ended up spiking them because the bore widths weren't standardized but they could fire further than the English cannons.