Hi there you all. I want to start off by concentrating on boilermaker, welding etc. Welding is the first part of Boiler-making as for you will need some kind of experience of it. Tag is the term we use for joining the material and is about 3 seconds of welding in a line. Go to https://www.wikihow.com/Arc-Weld if you are not comfortable in the welding procedures. Now. Taking a look at the square to round. it is either square or rectangular at the bottom, and circular at the top. On examining the "square to round", it will be seen that the curved part of the article will be exactly a quarter of a cone. Four of these segments will make up this curved portion of the surface, with the remaining parts being flat triangles.