Basic introduction Chinese name: Li Yongjun's personal profile, honors won, personal profile Li Yongjun, senior welding technician and chief technician of Xi 'an Rail Transit Equipment Co., Ltd., welding skill instructor of special equipment in Shaanxi Province, senior appraiser of welding professional professional skills appraisal, and international welding instructor. In 2002, he won the first place in the welder group in the Xi 'an West Excellent Worker Technical Competition, and won the titles of "Technical Champion" in Xi and "Technical Expert" in Shaanxi Province. In the same year, he was awarded the title of model worker and innovative expert in the factory. In 2004, he was awarded the "Locomotive" medal by the All-China Railway Federation, and in the same year, he was awarded the title of "Top Technical Talent" by CNR Corporation. In 2005, he won the first place in the Xi technical competition and was awarded the title of "technical champion" in Xi. In the same year, he won the title of "Model Worker" in Xi and "Golden Blue Collar" in CNR. In 2006, he was hired as "Xi Vocational Skills Leader". In 2007, he was awarded the title of model worker in Shaanxi Province. Comrade Li Yongjun is diligent and studious, and there is no end to learning. For more than ten years, with his love and persistent pursuit of welding work, he has grown from an ordinary welder to a senior welding technician with rich welding practice experience and solving welding technical problems in key processes. 1In July, 992, after graduating from Wuchang Vehicle Factory Technical School with excellent results, Comrade Li Yongjun was assigned to the No.1 workshop of Xi 'an Vehicle Factory to engage in electric welding. 1994, admitted to xidian university with excellent results, and obtained a college diploma after three years of hard study. Participated in manufacturing the largest two-way bus mobile platform, with its own weight100t. In view of the fact that the main beam of the moving platform must be bent upward and it is difficult to install, he proposed the method of welding back in the middle and both ends of the beam and the method of using the self-weight of the beam. After practice, it not only prevented the distortion of the beam, met the technical requirements of the drawings for the bending size of the main girder, shortened the construction period, but also provided conditions for the smooth installation of more than a dozen main girders. He studied hard and asked for advice modestly when he obtained evidence for third-class pressure vessel welders in factories and ship inspection bureaus. Through systematic theoretical study and skill practice, we have successively obtained the qualification certificate of 16 pressure vessel welder (including manual arc welding, automatic submerged arc welding, argon arc welding, etc. ) and 3 welder certificates from the Ship Inspection Bureau. At the same time, in view of the cold shrinkage cavity at the root of welded joint, cracks often appear in the joint during bending performance test, and the back of weld is poorly formed, so many welders cannot obtain qualification certificates. Through technical communication with other welders, consulting relevant information, consulting experts and repeated experiments, he finally worked out the methods of arc extinguishing welding and cleaning welding joints, thus solving this welding technical problem.