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narrow-gap variants of gaB-tungsten arc welding ( GTAW ) and submerged arc welding ( SAW ) , as well as a technology that might be applied in the future ( electron beam welding ) .
 manufacturing process: arc welding; manufacturing process: GTAW; manufacturing process: submerged arc welding; manufacturing process: SAW; material: as; material: as; concept or principle: technology; material: be; manufacturing process: electron beam 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:
 manufacturing process: arc welding; manufacturing process: GTAW; manufacturing process: submerged arc welding; manufacturing process: SAW; material: as; material: as; concept or principle: technology; material: be; manufacturing process: electron beam welding