Recently, the group member of China Quality Inspection Association Deutz FAW (Dalian) Diesel Engine Co., LTD., the second factory machine cylinder block 10 sequence OP10 German processing center tool change manipulator cast iron gearbox broke, resulting in equipment stop, affecting production. Due to the poor weldability of cast iron, it is easy to produce cold cracks after welding, if there is no very professional welding technology and welding experience of cast iron, welding maintenance can not be carried out. Considering that the procurement cycle of imported spare parts is long and expensive, such as waiting for replacement of spare parts after arrival, it will not only delay production, but also cost more than 60,000 yuan to purchase spare parts. The operation support room of the manufacturing process Department decided to let Wang Qinghuan, a senior welding technician in the kinetic energy maintenance class of a factory, try.

Wang Qinghuan is a trained welder, has more than 40 years of welding work experience, participated in many Dalian electric welding technology exchanges and training. When the gear box was shipped to a factory, Wang Qinghuan and Wang Decai, the monitor of the maintenance class of a factory, immediately began to repair it. With years of accumulated welding experience and technology, Wang Qinghuan used gas welding on the cracked outer mouth, electric welding on the inside, preheating before welding, hammering stress relief during welding, and heat preservation after welding. After more than three hours, the welding repair work was completed and the gear box was oiled. Finally, the welding surface was processed by the milling machine to meet the size requirements. The installation and use fully meet the working requirements. This self-maintenance not only avoids waiting for a long procurement cycle of imported spare parts, but also saves considerable maintenance and spare parts costs for the company.