540
Elemental Mg is easily evaporated or burnt during welding or wire + arc additive manufacturing ( WAAM ) , and results in a fluctuation of the composition and mechanical performances .
 material: Mg; manufacturing process: evaporated; manufacturing process: welding; manufacturing process: wire + arc additive manufacturing; manufacturing process: WAAM; concept or principle: composition; application: mechanical
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:
 material: Mg; manufacturing process: evaporated; manufacturing process: welding; manufacturing process: wire + arc additive manufacturing; manufacturing process: WAAM; concept or principle: composition; application: mechanical