As you probably already know, annealing is a process that softens and improves the ductility (and/or toughness) of copper and copper alloys. The process involves heating, holding (soaking) and cooling. Annealing is primarily a function of metal temperature and time, It also helps to give desirable shape of the bathtub by hands through a wooden hammered.
Annealing Process Of Copper Sinks & Bathtubs Sheets.
Hammer the copper lightly. Move over ½ an inch and hammer again. Repeat this process until We have hammered the entire surface. Check the copper sheet often to make sure that we like the results and adjust your technique as needed.
There are few images of argon welding process on Copper Bathtubs And Sinks.
The process of polishing copper/brass to a mirror finish involves applying an abrasive compound (use the brown cutting compound) onto your copper surface using the most abrasive wheel in the set (which will be mounted on a handheld electric drill via the mandrel to seriously speed up the process