Hello, everyone, ask for a wave soldering technician exam.

Line card number, last name, first name and achievements

1. Fill in the blank: (65438+ 0 point per grid) 57%

1. The solder furnace flux coating device consists of,,,

And composition; 5%

2. The principle of spraying device is: feed the spray nozzle at the same time, and mix with the spray nozzle.

Methods Atomize it through the middle hole and drive it to reciprocate, and then evenly coat it on the lower plate of PC board. 8%

3. Each hole of the nozzle of the spraying device has a code, and the installation must correspond to: flux inlet mark or; The air pressure inlet hole of the needle valve is marked as or; The injection air pressure inlet hole is marked as or; 6%

4. The tin spraying device consists of,,,

Wait. ; 5%

5. Welding principle The so-called welding is to use low-level and inter-metal, so that molten tin can be colored and form a surface. 5%

6. Definition of welding: When two metals are brazed, they are completely filled in the metal due to the action, that is to say, their adhesion is not, but. 6%

7. the 7.X-R control chart is the control chart; The control chart of tin furnace P is the control chart. 2%

8.TPV requires the contents of six harmful substances to be controlled as follows: lead (parts), cadmium, mercury, hexavalent chromium and polybrominated biphenyls/polybrominated diphenyl ethers. 7%

9.PC board conveying device consists of,,,,,. 5%

10, the principle of tin spraying is to complete automatic welding by driving tin to be sprayed from the nozzle. 3%

1 1, the role of tin spraying is to melt the solid state into left and right, and then spray it from the nozzle to weld the PC boards together. 5%

Second, the question and answer: 43%

1. Function of flux: 6%

Preheating function: 6%

3. Welding function: 4%

Function of 4.4. Printed circuit board conveyor: 3%

5. The defective rate of tin furnace is expressed by DPPM. The existing tin furnace workers sampled 50 plates in a period of time and caught 5 defects in the sampling. It is known that the total number of solder joints of this single board is 500. Please calculate its DPPM value? 5%- (Write formula first)

6. What are the benefits of tin furnace maintenance? 8%

7. What are the requirements for tin furnace fire prevention? 5%

8. The tin furnace operates at high temperature. What protective measures should be taken to prevent burns during operation and maintenance? 6%