3074
If the laser power is too low , it will result in a small melt pool and lack of fusion ; on the other hand , if the laser power is too high , it will result in keyhole and material evaporation .
 laser power, melt pool, fusion, laser power, material, evaporation
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 laser power, melt pool, fusion, laser power, material, evaporation