2
On the other hand , some drop of fatigue resistance and endurance limit was observed , affected by surface defects – small welding imperfections Ti-6Al-4V and AlSi5 wires were used for wire and arc additive manufacturing using the direct current cold metal transfer welding .
 machanical property: fatigue; machanical property: endurance limit; concept or principle: surface defects; manufacturing process: welding; concept or principle: imperfections; material: AlSi5; manufacturing process: wire and arc additive manufacturing; manufacturing process: cold metal transfer
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:
 machanical property: fatigue; machanical property: endurance limit; concept or principle: surface defects; manufacturing process: welding; concept or principle: imperfections; material: AlSi5; manufacturing process: wire and arc additive manufacturing; manufacturing process: cold metal transfer