Issues with welder qualifications for welding the cylinder to the nozzles

Welder qualification for TSG Z6002. . . . . FG. . . They cover the cylinder wall thickness and the outer diameter of the pipe connection, respectively. .

I’m not sure whether to use FG or G for the first question; for the second one, I think G is the right choice

This is nothing more than a fully penetrative welding structure with plug-type pipe/board corner joints and saddle-type pipe/board corner joints； I recommend using: For TIG welding, use GTAW-FeⅡ-6FG-12/18-Fefs-02/11/12 for carbon steel – small tubes/plates. There is no limit on the thickness of the cylinders; the outer diameter of the tubes must be ≥φ18, and there is no limit on the wall thickness. Welding can be performed in all positions ； SMAW-FeⅡ-6FG-12/18-Fef3J carbon steel – for small tubes/plates; shielded metal arc welding. No limit on cylinder thickness; outer diameter of tube ≥ φ18. No limit on tube wall thickness; welding in all positions ； For TIG welding, the GTAW-FeⅣ-6FG-12/18-Fefs-02/10/12 stainless steel is used; 45° TIG welding is applied to tubes/plates. There is no limit on the thickness of the cylinders, the outer diameter of the tubes must be ≥φ18, and there is no limit on the wall thickness of the tubes; welding can be performed in all positions ； During GMAW welding, SMAW-FeⅣ-6FG-12/18-Fef4J stainless steel tubes/plates are welded using a 45° GMAW electrode; there is no limit on the thickness of the cylinder, the outer diameter of the tube must be ≥φ18, there is no limit on the wall thickness of the tube, and welding can be performed in all positions ； The corner butt welding positions for tubes/plates come in the following forms: 5FG for horizontal fixing, 2FRG for horizontal rotation, 2FG for vertical fixing, and 6FG for all positions. Please refer to TSG Z6002-2010 carefully to determine the specific welding qualification requirements

This post was last edited by wanlirn on 2017-7-20 at 14:58. The first one uses a tube sheet 5FG, while the second one uses tube butt joint 2G; if the diameter of the tubes is greater than 76, plate-to-plate butt joint 2G can also be used

In both cases, tube sheet welding qualifications are required; neither the plate nor the tubes can serve as a substitute.

Both of these are combined welds of butt welds and fillet welds, and FG should be used

In the 02 edition of the rules for welder examinations, there is an explanation dedicated to pipe plate fillet joints; it specifies that the pipes require beveling while the plates do not. In such cases, the G qualification for butt welds is applicable. When the pipes do not require beveling but the plates do, the FG qualification is used. Unfortunately, there is no information provided regarding socket welds and inserted fittings. Without reading this explanation, it seems that all combined welds are classified under the FG qualification. After reading the explanation, things become even more confusing. I wonder if those who are familiar with the ASME standards have any specific explanations regarding welder examinations that could serve as a reference

In the 02 edition of the rules for welder examinations, there is an explanation dedicated to pipe plate fillet joints; it specifies that the pipes require beveling while the plates do not. In such cases, the G qualification for butt welds is applicable. When the pipes do not require beveling but the plates do, the FG qualification is used. Unfortunately, there is no information provided regarding socket welds and inserted fittings. Without reading this explanation, it seems that all combined welds are classified under the FG qualification. After reading the explanation, things become even more confusing. I wonder if those who are familiar with the ASME standards have any specific explanations regarding welder examinations that could serve as a reference