Looking for my lead-free solder craftsman

Jie Chen is an ordinary front-line equipment worker in Aerospace 8357 Research Institute. After working for 20 years, she became the "king of welding" in people's eyes with her unremitting efforts. The Long March 5 carrier rocket and several radar precision guidance systems that she participated in the development and assembly will be launched in the second half of this year. It is the unremitting efforts of tens of thousands of silently dedicated astronauts that have created the quality of space and boosted the development of Tianjin's space industry.

In the electrical assembly workshop of No.8357 Institute of the Eighth Academy of China Aerospace Science and Technology Corporation, Jie Chen is carefully welding the solder joints on the circuit board, and then installing the circuit board into the nearby chassis. These "high fuze telemetry interface boards" will be assembled into the core control unit of the missile. There are nearly 60 first-line electricians in 8357 factory. A technical backbone like Jie Chen has to weld thousands of solder joints the size of a needle tip every day. For others, it was an extremely boring job, but Jie Chen worked tirelessly for 20 years.

Jie Chen: "First of all, it is definitely easy to produce waste products. If it is not welded, weld it again. Our printed boards and cabinets are all welded by hand, and some boards have tens of thousands of solder joints. No matter what kind of job, I am an astronaut. I feel very good about contributing to the aerospace industry. "

Printed circuit boards are marked with different models according to their functions, the complexity of integrated circuits and the types of components to be soldered. Jie Chen is often faced with working between a few tenths of a millimeter. When she first started welding, Jie Chen's technology was not top-notch, but her unremitting pursuit of her career made her start with 100, 300 and 500 solder joints a day. She is good at observing and learning, and soon summed up a set of working methods and became the "king of welding" in the unit.

Jie Chen: "A printed board has many pads and solder holes, and the density of various devices is different. For example, an integrated chip has 100 or more than 200 pins. If the hair on your head is about to break, fold it. Master the temperature of the thermal stripper and practice each line well. This solder joint can only be welded for two to three seconds, not more than three seconds, and it is easy to damage the device if it exceeds three seconds. "

In Jie Chen's workstation, there is a piece of A4 paper that says "I am not the best, but I am the hardest". In her view, an excellent electrician should not only be familiar with the welding process of various products, but also understand the chemical composition, strength and toughness of welding materials. When welding, he should master the angle of soldering iron, control the temperature, keep breathing steady, and even control his pulse. Dealing with solder and screwdriver every day makes Jie Chen's skin white and tender, his hands are scarred and his palms are thicker.

Jie Chen: "When you hold a screwdriver with a tool, you need to twist the screw. Like these, they are all permed. Sometimes the corners of the chassis are pointed and hung. Sometimes there is a socket on the bottom plate when the handle is tied. The distance is particularly small and the chassis is particularly narrow. Pulling a few roads is a minor injury. "

Jie Chen said that even though what she did was only one ten thousandth of the space products, and her efforts were to ensure that this one ten thousandth was never wrong, under the leadership of Jie Chen, the quality level of the whole team reached 99.7%. Jie Chen said that it was "worthwhile" to pay Hua Song when he saw that the space products he participated in could really fly and run.

Jie Chen: "During the 1 1 military parade, our products flew in the sky and ran on the ground. When I watched them with my family, I was very proud that our products were on this model! Tianjin's current aerospace industry has reached a new level. "

It is understood that this year, a new generation of launch vehicle industrialization base in the west of the development zone, the Long March 5 launch vehicle undertaken by 8357, missile precision guidance radar and many other projects have entered a critical period of ending. With the joint efforts of tens of thousands of "craftsmen" such as Jie Chen, the "welding king", Tianjin has gradually become a national advanced manufacturing R&D base from a blank spot in the aerospace industry. Li Chaoxing, director of the Municipal Industry and Information Committee, said with emotion: "We call it three machines, one arrow, one satellite and one station. Now four Airbus A320 a month, 48 and 330 wide-body passenger planes a year have been assembled. The helicopter is headquartered in Tianjin, and the rescue helicopter for the future heavy helicopter project will also be produced in Tianjin, where it will be researched, developed, designed and manufactured. UAVs as small as more than 10,000 meters are all produced in Tianjin. Many satellites are made in Tianjin, including Tiangong-9 Space Station, and the future space station will also be made in Tianjin. Space technology has high content and great value. Advantageous pillar industries will promote the upgrading of China's industrial structure, create a new highland of advanced manufacturing industry, aim at the world's advanced level, fully implement Made in China 2025, and realize the development of China's manufacturing industry from large to strong.