While copper and steel tubes are usually connected by soldering, brazing or welding, there are times when a mechanical joint may be required or preferred. If you connect tubes with a mechanical connection you need flaring. The process call…

https://bestdrillbit.com/diamond-drill-bits/core-drill-diamond-tungsten-bits/ A hollow, cylindrical drill for making holes through a surface are called Core Drill Bit. The material left inside the drill bit is referred to as the core. The …