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The heat affected zone ( HAZ ) of laser-additive-welded joints was divided into B2 , B2 + α2 , and B2 + α2 + O — three regions with increasing distance from the fusion line .
 concept or principle: heat affected zone; concept or principle: HAZ; material: O; 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:
 concept or principle: heat affected zone; concept or principle: HAZ; material: O; concept or principle: fusion