This trough is then deepened by extending its inner wall in upward direction, and the thus formed deeper trough is then filled with welding material, preferably up to {HEAD ~ the top surface} of {TAIL ~ the pressure conveying element} 
of
This trough is then deepened by extending its inner wall in upward direction , and the thus formed deeper trough is then filled with welding material , preferably up to { HEAD ~ the top surface } of { TAIL ~ the pressure conveying element }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL