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For performance verification of the in-process inspection system , an intentionally embedded defect , a tungsten rod , is introduced into the multi-pass weld .
 concept or principle: performance; process characterization: inspection; concept or principle: defect; material: tungsten; machine or equipment: rod; engineering feature: weld
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: performance; process characterization: inspection; concept or principle: defect; material: tungsten; machine or equipment: rod; engineering feature: weld