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GMAW ( Gas Metal Arc Welding ) of titanium is not currently used in industry due to the high levels of spatter generation , the wandering of the welding arc and the consequent waviness of the weld bead .
 manufacturing process: GMAW; manufacturing process: Gas Metal Arc Welding; material: titanium; application: industry; process characterization: spatter; manufacturing process: welding; concept or principle: arc; engineering feature: waviness; concept or principle: weld bead
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: GMAW; manufacturing process: Gas Metal Arc Welding; material: titanium; application: industry; process characterization: spatter; manufacturing process: welding; concept or principle: arc; engineering feature: waviness; concept or principle: weld bead