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When comparing the EB welded AM parts to the EB welded cast samples two main differences were observed : weld metal porosity and a negligible HAZ in the AM joints and low porosity level but substantial HAZ in the welded cast parts .
 manufacturing process: welded; machine or equipment: AM parts; manufacturing process: welded cast; concept or principle: samples; material: weld metal; machanical property: porosity; concept or principle: HAZ; manufacturing process: AM; machanical property: porosity; concept or principle: HAZ; manufacturing process: welded cast
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: welded, AM parts, welded cast, samples, weld metal, porosity, HAZ, AM, porosity, HAZ, welded cast 
Answer:
 manufacturing process: welded; machine or equipment: AM parts; manufacturing process: welded cast; concept or principle: samples; material: weld metal; machanical property: porosity; concept or principle: HAZ; manufacturing process: AM; machanical property: porosity; concept or principle: HAZ; manufacturing process: welded cast