436
Here , wire arc additive manufacturing ( WAAM ) process was used to fabricate a steel-nickel structural component , whose average tensile strength of 634 MPa significantly exceeded that of feedstock materials ( steel , 537 MPa and nickel , 455 MPa ) , which has not been reported previously .
 manufacturing process: wire arc additive manufacturing; manufacturing process: WAAM; concept or principle: process; manufacturing process: fabricate; concept or principle: structural component; concept or principle: average; machanical property: strength; concept or principle: MPa; material: feedstock materials; material: steel; concept or principle: MPa; material: nickel; concept or principle: MPa
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufacturing process: wire arc additive manufacturing; manufacturing process: WAAM; concept or principle: process; manufacturing process: fabricate; concept or principle: structural component; concept or principle: average; machanical property: strength; concept or principle: MPa; material: feedstock materials; material: steel; concept or principle: MPa; material: nickel; concept or principle: MPa