Method of welding {HEAD ~ pipes} onto pressure conveying elements, especially pipe plates, pressure containers and {TAIL ~ collectors} 
onto
Method of welding { HEAD ~ pipes } onto pressure conveying elements , especially pipe plates , pressure containers and { TAIL ~ collectors }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL