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If the bypass temperature is above the martensite start temperature ( Ms ) , there is a homogeneous hardness level along the height of the additively manufactured structure height as long as the energy produced by the welding arc is enough to keep the temperature of all layers above Ms. Wire-arc additive manufacturing has become an alternative way to produce industrial parts .
 process parameter: temperature; material: martensite; process parameter: temperature; concept or principle: homogeneous; machanical property: hardness; manufacturing process: additively manufactured; material: as; material: as; manufacturing process: welding; concept or principle: arc; process parameter: temperature; manufacturing process: Wire-arc additive manufacturing; application: industrial
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:
 process parameter: temperature; material: martensite; process parameter: temperature; concept or principle: homogeneous; machanical property: hardness; manufacturing process: additively manufactured; material: as; material: as; manufacturing process: welding; concept or principle: arc; process parameter: temperature; manufacturing process: Wire-arc additive manufacturing; application: industrial