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If the hole is very small the material you are brazing with should fill it. A small piece sheet metal can be brazed in place to cover larger holes.
Blanking and punching are both shearing operation. The difference is only in the scrap. In blanking what you cut out is of interest.In punching what you cut from is of interest.For example: You cut a hole in a sheet metal. If you are interested in the disc that is cut out, then the process is called blanking. The sheet metal with a hole through it is the scrap. If you are interested in the sheet metal that now has a hole through it, then the process is called punching. The disc is the scrap.
With duct tape I install and maintain duct work for a living if you want to seal the joints just wrap the tape around the duct. If you need to cover a hole you will need to screw a piece of metal on the duct over the hole and tape over the edges of your patch. this is the simplest and cheapest way I know to do it.
The molds should be sand coated insides and a hole upside mold then introduce the molten metal.
A tek screw is a screw that has a drill bit tip for a point rather than coming to a sharp point like a needle. These are self-drilling screws and need no pilot hole. Tek is a brand name for self-drilling screws as Kleenex is a brand name for nose tissue. self-drilling screws are similar to sheet metal screws but have a drill point instead of coming to a sharp point and will drill their own hole. This eliminates the need to pre-drill a pilot hole.
A plasma cutter.
use a punch press or drill it
If the hole is very small the material you are brazing with should fill it. A small piece sheet metal can be brazed in place to cover larger holes.
Yes.
The sheet expands outwards as well
I think you are referring to a method of locating a nut in a piece of sheet metal. A rivet head nut is a nut with has a small projection not much thicker than the sheet metal to which you intend to fit it. This projection fits through a pre made hole in the sheet metal, and the small projection is peened over (deformed by hammering) to fix the nut to the sheet.
A circular piece of metal with a hole in it.
drill small hole in old seal use sheet metal screw drill small hole in old seal use sheet metal screw
It would get larger due to the expansion of the metal (see the related links)
Blanking and punching are both shearing operation. The difference is only in the scrap. In blanking what you cut out is of interest.In punching what you cut from is of interest.For example: You cut a hole in a sheet metal. If you are interested in the disc that is cut out, then the process is called blanking. The sheet metal with a hole through it is the scrap. If you are interested in the sheet metal that now has a hole through it, then the process is called punching. The disc is the scrap.
Escutcheon
If a hole has been drilled in a metal sheet, the round file is used in the created hole to remove rough edges.