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Accurate on-line weld defects detection is still challenging for robotic welding manufacturing due to the complexity of weld defects .
 process characterization: Accurate; engineering feature: weld; concept or principle: defects; manufacturing process: robotic welding manufacturing; concept or principle: complexity; engineering feature: weld; concept or principle: defects
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:
 process characterization: Accurate; engineering feature: weld; concept or principle: defects; manufacturing process: robotic welding manufacturing; concept or principle: complexity; engineering feature: weld; concept or principle: defects