Application of vertical down welding in long distance pipe-line welding[J]. MW Metal Forming, 2009, (18): 52-54.
            
            
                
                    | 
                        
                            Citation:
                        
                     | 
                    
                        Application of vertical down welding in long distance pipe-line welding[J]. MW Metal Forming, 2009, (18): 52-54.
                        
                     | 
                
            
         
        
            
                Application of vertical down welding in long distance pipe-line welding[J]. MW Metal Forming, 2009, (18): 52-54.
            
            
                
                    | 
                        
                            Citation:
                        
                     | 
                    
                        Application of vertical down welding in long distance pipe-line welding[J]. MW Metal Forming, 2009, (18): 52-54.
                        
                     |