945
It has been also found that it is more difficult to achieve pure conduction welds with small beam diameters , which are typically used in powder bed additive manufacturing , due to high conduction losses and low vaporisation threshold .
 engineering feature: welds; process parameter: beam diameters; manufacturing process: powder bed additive manufacturing
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:
 engineering feature: welds; process parameter: beam diameters; manufacturing process: powder bed additive manufacturing