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This study has therefore provided an experimental work to investigate the formation of the humping phenomena in the positional deposition during additive manufacturing with the gas metal arc welding .
 concept or principle: experimental; concept or principle: deposition; manufacturing process: additive manufacturing; manufacturing process: gas metal arc welding
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: experimental; concept or principle: deposition; manufacturing process: additive manufacturing; manufacturing process: gas metal arc welding