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The influence of the welding angles on the microstructure , microhardness of base metals , fusion zone , and heat-affected zones , as well as the macro tensile test have been characterized .
 manufacturing process: welding; concept or principle: microstructure; concept or principle: microhardness; material: base metals; concept or principle: fusion zone; material: as; material: as; engineering feature: macro
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: welding; concept or principle: microstructure; concept or principle: microhardness; material: base metals; concept or principle: fusion zone; material: as; material: as; engineering feature: macro