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In this research , gas metal arc welding ( GMAW ) process has been used using AWS ER70B-6 electrode wire to create a multi-layer single pass structure after controlling the parameters including current , voltage and travel speed so that uniform height is attained throughout the weld bead .
 concept or principle: research; manufacturing process: gas metal arc welding; manufacturing process: GMAW; concept or principle: process; material: ER70B-6; machine or equipment: electrode; concept or principle: structure; concept or principle: parameters; 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:
 concept or principle: research; manufacturing process: gas metal arc welding; manufacturing process: GMAW; concept or principle: process; material: ER70B-6; machine or equipment: electrode; concept or principle: structure; concept or principle: parameters; concept or principle: weld bead