Final answer:
The size of the cover fillet weld around the fully penetrated groove weld of the branch into the header is determined by the welding code or standard being used. The welding code provides guidelines on the minimum and maximum size of the fillet weld based on factors such as the thickness of the base material, the type of welding process, and the type of material being welded.
Step-by-step explanation:
The size of the cover fillet weld around the fully penetrated groove weld of the branch into the header is determined by the welding code or standard being used. The welding code will provide guidelines on the minimum and maximum size of the fillet weld based on factors such as the thickness of the base material, the type of welding process, and the type of material being welded.
For example, in the American Welding Society (AWS) D1.1 structural welding code, Table 3.9 provides the minimum fillet weld size for various base material thicknesses. The size of the cover fillet weld can be determined by referencing the appropriate table in the welding code and selecting the minimum required size.
It is important to note that the required size of the cover fillet weld should be specified in the welding procedure specification (WPS) for the specific welding project, which is based on the requirements of the applicable welding code. The WPS is developed by a qualified welding engineer or specialist and serves as a set of instructions for the welder to follow during the fabrication process.