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On May 21, 2015, a 12-member team from China Railway Fourth Group visited Aigre in Chengdu for a week-long welding operation training on the UN5-150ZB mobile flash welding machine.

Senior engineers provided detailed introductions to the machine's structure, working principles, welding procedures, and precautions. They also elaborated on operation essentials, troubleshooting, and after-sales services, answering all questions raised by the participants. Through diligent study and on-site observations, all participants gained a deeper understanding of the welding machines, mastered the operation essentials, and successfully passed the welding operator qualification assessment, obtaining welding operation certificates.

The training session was a success, fostering a deeper understanding and friendship between Aigre and the China Railway Fourth Group team.