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It was found that there existed a large stress concentration in the conventional welded joints , whereas those welded joints with elongated weld bead were accompanied by a lower stress concentration , especially for elongated weld bead with MTT design .
 process characterization: stress concentration; engineering feature: welded joints; engineering feature: welded joints; concept or principle: weld bead; process characterization: stress concentration; concept or principle: weld bead; engineering feature: design
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:
 process characterization: stress concentration; engineering feature: welded joints; engineering feature: welded joints; concept or principle: weld bead; process characterization: stress concentration; concept or principle: weld bead; engineering feature: design