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The main issue WAAM is the sensibility to heat accumulation , i.e. , a progressive increase in the internal energy of the workpiece due to the high heat input of the deposition process , that is responsible of excessive remelting of the lower layers and the related change in bead geometry .
 manufacturing process: WAAM; machanical property: heat accumulation; concept or principle: workpiece; concept or principle: heat; manufacturing process: deposition process; process characterization: bead geometry
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:
 manufacturing process: WAAM; machanical property: heat accumulation; concept or principle: workpiece; concept or principle: heat; manufacturing process: deposition process; process characterization: bead geometry