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The investigation divulges that electrode positions and torch orientation significantly impact arc stability which in turn impacts the heat input and weld bead geometry .
 machine or equipment: electrode; concept or principle: orientation; concept or principle: impact arc; concept or principle: heat; process parameter: weld 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:
 machine or equipment: electrode; concept or principle: orientation; concept or principle: impact arc; concept or principle: heat; process parameter: weld bead geometry