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Tensile- shear testing showed that the seam welds of AISI 304 , C-Mn steel , Nickel-based alloy were stronger than the starting base metal counterparts while AA6061 was weaker due to softening .
 process characterization: Tensile- shear testing; engineering feature: seam welds; material: AISI 304; material: C-Mn steel; material: Nickel-based alloy; material: base metal; material: AA6061
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: Tensile- shear testing; engineering feature: seam welds; material: AISI 304; material: C-Mn steel; material: Nickel-based alloy; material: base metal; material: AA6061