1026
Since additive metal deposition is basically a welding method , which creates parts by successively adding layers of material , there is a chance for defects like pores , cracks , inclusions and lack of fusion to develop .
 material: additive; concept or principle: deposition; manufacturing process: welding; material: material; concept or principle: defects; machanical property: pores; material: inclusions; concept or principle: fusion
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: additive; concept or principle: deposition; manufacturing process: welding; material: material; concept or principle: defects; machanical property: pores; material: inclusions; concept or principle: fusion