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However , a large number of internal defects appear during welding and AM processes in Mo and its alloys , which is far from well understood and has greatly limited their application .
 concept or principle: defects; manufacturing process: welding; manufacturing process: AM processes; material: Mo; material: alloys
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:
 concept or principle: defects; manufacturing process: welding; manufacturing process: AM processes; material: Mo; material: alloys