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