Carbon Steel Welded Nailhead Tube

Studded Tube or called Nailhead tube

Steel studded tubes are used instead of Fin Tube for heat transfer in the processing industries, generally in furnaces, gas turbines, fired heaters and furnace applictions where the surface is exposed to a very corrosive environment and where very dirty gas streams require frequent or aggressive cleaning.

 The steel studs(Welded Stainless Tube) are automatically resistance welded to the tube, producing high quality forge welds. The welding process enables the combination of any grades for studs and tube(Black Welded Pipe): carbon, low alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.

 Because of their relative easy of cleaning, studded tube(Stainless Steel Welded Tube) or nail head pipes(Weld Galvanized Pipe) are used in furnaces and fired heaters as an alternative to high frequency welded finned tubes wherever the process application is such that heavy fouling of the external surface may occur.

Test of studded tube

Welding tests are carried out as a matter of course to ensure the effectiveness of the stud to pipe bond. Heat treatment of the completed studded tube is carried out where necessary. Should fouling eventually reduce the process performance of the equipment, the studded surface can be

cleaned efficiently by shot blasting without damage to the materials.

 An electric current is applied by connect on the stud and tube and theresistance in this circuit produces the heat necessary for welding. Maximum resistance and therefore maximum heating occurs at the interface Between the Stud and the tube. Pressure to forge the Stud and the tube together at the point of maximum heating is applied by various forms of tooling. These resistance welding processes produce a strong metallurgical bond between the stud and the tube while minimizing the heat affected zone (HAZ) in the tube. The use of pressure to forge the fin and the tube together helps to minimize the heat input necessary to make the weld. This Product is used in Fired Heaters under Very High Pressure & Temperature mainly in Petroleum refineries.