Smooth connection between flange and pipes The interior of the flange is welded in a circle and polished,NO welding slag. Sensor position not protrude inside surface Flange thickness we used are 10mm,12mm and 15mm The deformation coefficient of the flange surface within 0.5mm TIG weld make sure the firmness and gilding surface Inside of pipe head polish 5cm,achieve better air flow and sound Beautiful surface finish,polish or brush Mark your logo for free.