In the process of wave soldering, the tin bar will produce tin dross, how to deal with it?

2022-08-01

There are many factors that affect Wave soldering. The content of tin slag during Wave Soldering is too high. First of all, it is necessary to distinguish whether the composition of tin slag is correct. If the tin slag is in the form of black powder, it is normal. One of the solder products, tin bars can be divided into two types: lead-free tin bars and lead tin bars. They are both used for arc welding. The following is a summary of the reasons for you:

1. The peak value is too high, the peak value is too wide, the double-peak furnace is too close, choose a rotary pump.

2. The soldering temperature is generally low, which can generally be divided into 280°C ± 5°C (for lead-free SN-CU0.7 tin rods), the welding rod is the Z basic temperature required in the welding process, and the low temperature will lead to tin Too much slag.

3. Human relationship, it is also very important to add tin bar when appropriate. The appropriate tin bar is to shorten the distance between the tin surface and the peak as much as possible each time tin is added.

4. The tin slag should be removed frequently, and the solder falling from the peak should enter the furnace as quickly as possible, instead of being left on the tin slag. The uneven heating will also cause excessive tin slag.

5. It is also very important to use the tin-clearing furnace in general. The tin-clearing furnace is not clear for a long time, and the impurity content in the furnace is high, which is also one of the reasons for the formation of excessive bean-like tin slag.

Solution:

1. Check the tin slag to see if there is a certain amount of tin slag before the tin furnace is opened for operation. It is necessary to clean up the tin slag left before the previous work in time, especially the area of the wave runner.

2. Check the amount of tin in the tin furnace. The amount of tin in the furnace should be 0.5-1cm close to the furnace surface when the wave is stopped. If the amount of tin is small, the contact area with the air is large, and the probability of oxidation is also large. If it is larger, the impact force of the liquid tin will also become larger, the torrent will roll over, and there will be more tin dross formed! It is recommended to add tin bars to the tin furnace immediately.

3. Check the temperature of the tin furnace. When the working temperature is low, it is easy to form a temporary infusible accumulation when the hot tin flows back into the furnace from the nozzle. It is recommended that customers increase the working temperature of the tin furnace within the allowable scale of the product.

4. It is recommended that operators break slag on time. They must break slag before leaving get off work every day. There is no need to walk the board during slagging. Raise the furnace temperature by about 10 °C (actual temperature) before slagging. It is better to use a small amount of recovery powder when slagging. Speed up the separation of tin and slag, which will significantly reduce the amount of slag.

If the peak welding is normal, the reason for the sudden appearance of tin slag: the heating tube of the tin furnace is burned out, resulting in insufficient heating, uneven heating, and a lot of tin slag.

As mentioned above, it is to explain some situations that wave soldering will present to you, as well as solutions, I hope it can help you. Semi-automatic dip tin furnace

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