Examples of the processes POLYFUSION 10 is a true multipurpose machine. Sheets welding in horizontal position (flat welding). Sheet welding in round position (circular welding). In this way a tube (cylinder) is obtained from a sheet. Minimum diameter 18”; Maximum diameter is unlimited. Sheets welding in vertical position (welding at 90° angles). One sheet in horizontal position and the other one in vertical position. With this working mode is also possible to made tubes with rectangular cross section (minimum size 5 ¼” x 9”) or square cross section (minimum 12 ½” x 12 ½”). FABRICATION OF SQUARE TANKS POLYFUSION 10 can build a tubular section of rectangular or square section, from 4 flat sheets. This could be the construction of tank's walls. Operation 1: first corner welding. Operation 2: second corner welding. Operation 3: third corner welding. Operation 4: fourth corner welding. Operation 1: welding of bottom to front vertical wall. Operation 2: welding of inner wall to bottom. Operation 3: welding of bottom to second inner wall. Operation 4: welding of the third vertical wall. Operation 5: welding of the bottom to third vertical wall. Operation 6: welding of the last back wall to bottom.