The carbon equivalent number for carbon steel indicates the 'weldability' of the steel. The table below shows relative weldability for various CE values:
                
                    
                        
                            | Carbon Equivalent | 
                            Weldability | 
                        
                        
                            | up to 0.35 | 
                            Excellent | 
                        
                        
                            | 0.35 to 0.40 | 
                            Very Good | 
                        
                        
                            | 0.41 to 0.45 | 
                            Good | 
                        
                        
                            | 0.46 to 0.50 | 
                            Fair | 
                        
                        
                            | over 0.50 | 
                            Poor |