This is thesis who institute course of welding process engineering.The mainly about the trend of welding and visited the well-known manufacturer of welding material in Taiwan which is called 'GOODWELD', get experience and understanding of the production SMAW welding, GMAW of CO2 welding and FCAW powder welding to exhibit different welding way. Paper link(Chinese ver. only): https://drive.google.com/drive/folders/1DejuvnHSJrQumg8tqcD6ESuoPL-pe8PJ?usp=sharing